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系出名门Android(10) - HTTP 通信, XML 解析, 通过 Hander 实现异步消息处理

webabcd — Fri, 29 Jan 2010 00:20:00 GMT

阅读: 799 评论: 0 作者: webabcd 发表于 2010-01-29 08:20 原文链接

系出名门Android(10) - HTTP 通信, XML 解析, 通过 Hander 实现异步消息处理

作者：webabcd

介绍
在 Android 中与服务端做 HTTP 通信，解析 XML，通过 Handler 实现异步消息处理

HTTP 通信 - 与服务端做 HTTP 通信，分别以 GET 方式和 POST 方式做演示
XML 解析 - 可以用两种方式解析 XML，分别是 DOM 方式和 SAX 方式
异步消息处理 - 通过 Handler 实现异步消息处理，以一个自定义的异步下载类来说明 Handler 的用法

1、HTTP 通信和 XML 解析的 Demo
MySAXHandler.java

代码

package com.webabcd.communication;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

// 继承 DefaultHandler 以实现指定 XML 的 SAX 解析器
// DOM - W3C 标准，需要把 xml 数据全部加载完成后才能对其做解析，可对树做任意遍历
// SAX - 流式解析，通过事件模型解析 xml，只能顺序解析
public class MySAXHandler extends DefaultHandler {

    private boolean mIsTitleTag = false;
    private boolean mIsSalaryTag = false;
    private boolean mIsBirthTag = false;
    private String mResult = "";

    // 打开 xml 文档的回调函数
    @Override
    public void startDocument() throws SAXException {
        // TODO Auto-generated method stub
        super.startDocument();
    }

    // 关闭 xml 文档的回调函数
    @Override
    public void endDocument() throws SAXException {
        // TODO Auto-generated method stub
        super.endDocument();
    }

    // 一发现元素开始标记就回调此函数
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        if (localName == "title")
            mIsTitleTag = true;
        else if (localName == "salary")
            mIsSalaryTag = true;
        else if (localName == "dateOfBirth")
            mIsBirthTag = true;
        else if (localName == "employee")
            mResult += "\nname:" + attributes.getValue("name");
    }

    // 一发现元素结束标记就回调此函数
    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        if (localName == "title")
            mIsTitleTag = false;
        else if (localName == "salary")
            mIsSalaryTag = false;
        else if (localName == "dateOfBirth")
            mIsBirthTag = false;
    }

    // 一发现元素值或属性值就回调此函数
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        if (mIsTitleTag)
            mResult += new String(ch, start, length);
        else if (mIsSalaryTag)
            mResult += " salary:" + new String(ch, start, length);
        else if (mIsBirthTag)
            mResult += " dateOfBirth:" + new String(ch, start, length);
    }

    public String getResult(){
        return mResult;
    }
}

Main.java

代码

package com.webabcd.communication;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.ByteArrayBuffer;
import org.apache.http.util.EncodingUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Main extends Activity {

    private TextView textView;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        textView = (TextView) this.findViewById(R.id.textView);

        Button btn1 = (Button) this.findViewById(R.id.btn1);
        btn1.setText("http get demo");
        btn1.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                httpGetDemo();
            }
        });

        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setText("http post demo");
        btn2.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                httpPostDemo();
            }
        });

        Button btn3 = (Button) this.findViewById(R.id.btn3);
        // DOM - Document Object Model
        btn3.setText("DOM 解析 XML");
        btn3.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                DOMDemo();
            }
        });

        Button btn4 = (Button) this.findViewById(R.id.btn4);
        // SAX - Simple API for XML
        btn4.setText("SAX 解析 XML");
        btn4.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                SAXDemo();
            }
        });
    }

    // Android 调用 http 协议的 get 方法
    // 本例：以 http 协议的 get 方法获取远程页面响应的内容
    private void httpGetDemo(){
        try {
            // 模拟器测试时，请使用外网地址
            URL url = new URL("http://xxx.xxx.xxx");
            URLConnection con = url.openConnection();

            String result = "http status code: " + ((HttpURLConnection)con).getResponseCode() + "\n";
            // HttpURLConnection.HTTP_OK

            InputStream is = con.getInputStream();
            BufferedInputStream bis = new BufferedInputStream(is);
            ByteArrayBuffer bab = new ByteArrayBuffer(32);
            int current = 0;
            while ( (current = bis.read()) != -1 ){
                bab.append((byte)current);
            }
            result += EncodingUtils.getString(bab.toByteArray(), HTTP.UTF_8);

            bis.close();
            is.close();

            textView.setText(result);
        } catch (Exception e) {
            textView.setText(e.toString());
        }
    }

    // Android 调用 http 协议的 post 方法
    // 本例：以 http 协议的 post 方法向远程页面传递参数，并获取其响应的内容
    private void httpPostDemo(){
        try {
            // 模拟器测试时，请使用外网地址
            String url = "http://5billion.com.cn/post.php";
            Map<String, String> data = new HashMap<String, String>();
            data.put("name", "webabcd");
            data.put("salary", "100");

            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            ArrayList<BasicNameValuePair> postData = new ArrayList<BasicNameValuePair>();
            for (Map.Entry<String, String> m : data.entrySet()) {
                postData.add(new BasicNameValuePair(m.getKey(), m.getValue()));
            }

            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postData, HTTP.UTF_8);
            httpPost.setEntity(entity);

            HttpResponse response = httpClient.execute(httpPost);

            String result = "http status code: " + response.getStatusLine().getStatusCode() + "\n";
            // HttpURLConnection.HTTP_OK

            HttpEntity httpEntity = response.getEntity();

            InputStream is = httpEntity.getContent();
            result += convertStreamToString(is);

            textView.setText(result);
        } catch (Exception e) {
            textView.setText(e.toString());
        }
    }

    // 以 DOM 方式解析 XML（xml 数据详见 res/raw/employee.xml）
    private void DOMDemo(){
        try    {
            DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
            Document doc = docBuilder.parse(this.getResources().openRawResource(R.raw.employee));
            Element rootElement = doc.getDocumentElement();
            NodeList employeeNodeList = rootElement.getElementsByTagName("employee");

            textView.setText("DOMDemo" + "\n");
            String title = rootElement.getElementsByTagName("title").item(0).getFirstChild().getNodeValue();
            textView.append(title);
            for (int i=0; i<employeeNodeList.getLength(); i++){
                Element employeeElement = ((Element)employeeNodeList.item(i));
                String name = employeeElement.getAttribute("name");
                String salary = employeeElement.getElementsByTagName("salary").item(0).getFirstChild().getNodeValue();
                String dateOfBirth = employeeElement.getElementsByTagName("dateOfBirth").item(0).getFirstChild().getNodeValue();
                textView.append("\nname: "+name+" salary: "+salary+" dateOfBirth: " + dateOfBirth);
            }
        } catch (Exception e) {
            textView.setText(e.toString());
        }
    }

    // 以 SAX 方式解析 XML（xml 数据详见 res/raw/employee.xml）
    // SAX 解析器的实现详见 MySAXHandler.java
    private void SAXDemo(){
        try    {
            SAXParserFactory saxFactory = SAXParserFactory.newInstance();
            SAXParser parser = saxFactory.newSAXParser();
            XMLReader reader = parser.getXMLReader();

            MySAXHandler handler = new MySAXHandler();
            reader.setContentHandler(handler);
            reader.parse(new InputSource(this.getResources().openRawResource(R.raw.employee)));
            String result = handler.getResult();
            textView.setText("SAXDemo" + "\n");
            textView.append(result);
        } catch (Exception e) {
            textView.setText(e.toString());
        }
    }

    // 辅助方法，用于把流转换为字符串
    private String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return sb.toString();
    }
}

2、用 Handler 来实现异步消息处理，以一个可以实时汇报下载进度的异步下载类为例
开发一个 Android 类库，本例中此类库名为 webabcd_util

New -> Java Project
项目上点右键 -> Build Path -> Add Libraries -> User Library -> User Libraries -> New -> 为类库起个名字 -> 选中这个类库 -> Add JARs 导入 Android 的 jar 包
项目上点右键 -> Build Path -> Add Libraries -> User Library -> 选择 Android 库

DownloadManagerAsync.java

代码

package webabcd.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.protocol.HTTP;

import android.os.Handler;
import android.os.Message;
import android.util.Log;

// 以一个实例，即异步下载，来演示 Android 的异步消息处理（用 Handler 的方式）
public class DownloadManagerAsync {

    public DownloadManagerAsync() {

    }

    // 实例化自定义的 Handler
    EventHandler mHandler = new EventHandler(this);

    // 按指定 url 地址下载文件到指定路径
    public void download(final String url, final String savePath) {
        new Thread(new Runnable() {
            public void run() {
                try {
                    sendMessage(FILE_DOWNLOAD_CONNECT);
                    URL sourceUrl = new URL(url);
                    URLConnection conn = sourceUrl.openConnection();
                    InputStream inputStream = conn.getInputStream();

                    int fileSize = conn.getContentLength();

                    File savefile = new File(savePath);
                    if (savefile.exists()) {
                        savefile.delete();
                    }
                    savefile.createNewFile();

                    FileOutputStream outputStream = new FileOutputStream(
                            savePath, true);

                    byte[] buffer = new byte[1024];
                    int readCount = 0;
                    int readNum = 0;
                    int prevPercent = 0;
                    while (readCount < fileSize && readNum != -1) {
                        readNum = inputStream.read(buffer);
                        if (readNum > -1) {
                            outputStream.write(buffer);
                            readCount = readCount + readNum;

                            int percent = (int) (readCount * 100 / fileSize);
                            if (percent > prevPercent) {
                                // 发送下载进度信息
                                sendMessage(FILE_DOWNLOAD_UPDATE, percent,
                                        readCount);

                                prevPercent = percent;
                            }
                        }
                    }

                    outputStream.close();
                    sendMessage(FILE_DOWNLOAD_COMPLETE, savePath);

                } catch (Exception e) {
                    sendMessage(FILE_DOWNLOAD_ERROR, e);
                    Log.e("MyError", e.toString());
                }
            }
        }).start();
    }

    // 读取指定 url 地址的响应内容
    public void download(final String url) {
        new Thread(new Runnable() {
            public void run() {
                try {
                    sendMessage(FILE_DOWNLOAD_CONNECT);
                    URL sourceUrl = new URL(url);
                    URLConnection conn = sourceUrl.openConnection();
                    conn.setConnectTimeout(3000);
                    BufferedReader reader = new BufferedReader(
                            new InputStreamReader(conn.getInputStream(),
                                    HTTP.UTF_8));

                    String line = null;
                    StringBuffer content = new StringBuffer();
                    while ((line = reader.readLine()) != null) {
                        content.append(line);
                    }

                    reader.close();

                    sendMessage(FILE_DOWNLOAD_COMPLETE, content.toString());

                } catch (Exception e) {
                    sendMessage(FILE_DOWNLOAD_ERROR, e);
                    Log.e("MyError", e.toString());
                }
            }
        }).start();
    }

    // 向 Handler 发送消息
    private void sendMessage(int what, Object obj) {
        // 构造需要向 Handler 发送的消息
        Message msg = mHandler.obtainMessage(what, obj);
        // 发送消息
        mHandler.sendMessage(msg);
    }

    private void sendMessage(int what) {
        Message msg = mHandler.obtainMessage(what);
        mHandler.sendMessage(msg);
    }

    private void sendMessage(int what, int arg1, int arg2) {
        Message msg = mHandler.obtainMessage(what, arg1, arg2);
        mHandler.sendMessage(msg);
    }

    private static final int FILE_DOWNLOAD_CONNECT = 0;
    private static final int FILE_DOWNLOAD_UPDATE = 1;
    private static final int FILE_DOWNLOAD_COMPLETE = 2;
    private static final int FILE_DOWNLOAD_ERROR = -1;

    // 自定义的 Handler
    private class EventHandler extends Handler {
        private DownloadManagerAsync mManager;

        public EventHandler(DownloadManagerAsync manager) {
            mManager = manager;
        }

        // 处理接收到的消息
        @Override
        public void handleMessage(Message msg) {

            switch (msg.what) {
            case FILE_DOWNLOAD_CONNECT:
                if (mOnDownloadConnectListener != null)
                    mOnDownloadConnectListener.onDownloadConnect(mManager);
                break;
            case FILE_DOWNLOAD_UPDATE:
                if (mOnDownloadUpdateListener != null)
                    mOnDownloadUpdateListener.onDownloadUpdate(mManager,
                            msg.arg1);
                break;
            case FILE_DOWNLOAD_COMPLETE:
                if (mOnDownloadCompleteListener != null)
                    mOnDownloadCompleteListener.onDownloadComplete(mManager,
                            msg.obj);
                break;
            case FILE_DOWNLOAD_ERROR:
                if (mOnDownloadErrorListener != null)
                    mOnDownloadErrorListener.onDownloadError(mManager,
                            (Exception) msg.obj);
                break;
            default:
                break;
            }
        }
    }

    // 定义连接事件
    private OnDownloadConnectListener mOnDownloadConnectListener;
    public interface OnDownloadConnectListener {
        void onDownloadConnect(DownloadManagerAsync manager);
    }
    public void setOnDownloadConnectListener(OnDownloadConnectListener listener) {
        mOnDownloadConnectListener = listener;
    }

    // 定义下载进度更新事件
    private OnDownloadUpdateListener mOnDownloadUpdateListener;
    public interface OnDownloadUpdateListener {
        void onDownloadUpdate(DownloadManagerAsync manager, int percent);
    }
    public void setOnDownloadUpdateListener(OnDownloadUpdateListener listener) {
        mOnDownloadUpdateListener = listener;
    }

    // 定义下载完成事件
    private OnDownloadCompleteListener mOnDownloadCompleteListener;
    public interface OnDownloadCompleteListener {
        void onDownloadComplete(DownloadManagerAsync manager, Object result);
    }
    public void setOnDownloadCompleteListener(
            OnDownloadCompleteListener listener) {
        mOnDownloadCompleteListener = listener;
    }

    // 定义下载异常事件
    private OnDownloadErrorListener mOnDownloadErrorListener;
    public interface OnDownloadErrorListener {
        void onDownloadError(DownloadManagerAsync manager, Exception e);
    }
    public void setOnDownloadErrorListener(OnDownloadErrorListener listener) {
        mOnDownloadErrorListener = listener;
    }
}

调用上面的自定义的 Android 类库

项目上点右键 -> Properties -> Java Build Path -> Projects -> Add 引用上面的类库

Main.java

代码

package com.webabcd.handler;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

import webabcd.util.DownloadManagerAsync;

public class Main extends Activity implements
        DownloadManagerAsync.OnDownloadCompleteListener,
        DownloadManagerAsync.OnDownloadUpdateListener,
        DownloadManagerAsync.OnDownloadErrorListener {

    TextView txt;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        DownloadManagerAsync manager = new DownloadManagerAsync();
        manager.setOnDownloadCompleteListener(this);
        manager.setOnDownloadUpdateListener(this);
        manager.download("http://files.cnblogs.com/webabcd/Android.rar", "/sdcard/Android.rar");

        txt = (TextView) this.findViewById(R.id.txt);
        txt.setText("开始下载");
    }

    public void onDownloadComplete(DownloadManagerAsync manager, Object result) {

        txt.setText("下载完成");
    }

    public void onDownloadUpdate(DownloadManagerAsync manager, int percent) {

        txt.setText("下载进度：" + String.valueOf(percent) + "%");
    }

    public void onDownloadError(DownloadManagerAsync manager, Exception e) {

        txt.setText("下载出错");
    }
}

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系出名门Android(9) - 数据库支持(SQLite), 内容提供器(ContentProvider)

webabcd — Thu, 28 Jan 2010 09:18:00 GMT

阅读: 665 评论: 0 作者: webabcd 发表于 2010-01-28 17:18 原文链接

系出名门Android(9) - 数据库支持(SQLite), 内容提供器(ContentProvider)

作者：webabcd

介绍
在 Android 中使用 SQLite, ContentProvider

数据库支持(SQLite) - Android 开发平台提供了操作 SQLite 数据库的相关 API
内容提供器(ContentProvider) - 当数据需要在应用程序之间共享时，可以在某程序中使用 ContentProvider 定义 URI，以使其它应用程序可以通过此 URI 访问指定的数据

1、SQLite 的 Demo
DatabaseHelper.java

代码

package com.webabcd.SQLite;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;

// 数据库操作的 Helper 类
public class DatabaseHelper extends SQLiteOpenHelper {

    DatabaseHelper(Context context, String name, CursorFactory cursorFactory, int version) {
        super(context, name, cursorFactory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO 创建数据库后，对数据库的操作
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO 更改数据库版本的操作
    }

    @Override
    public void onOpen(SQLiteDatabase db) {
        super.onOpen(db);

        // TODO 每次成功打开数据库后首先被执行
    }
}

Main.java

代码

package com.webabcd.SQLite;

import java.util.Random;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Main extends Activity {

    private DatabaseHelper dbHelper;

    private static final String DATABASE_NAME = "db.db";
    private static final int DATABASE_VERSION = 1;
    private static final String TABLE_NAME = "employee";

    TextView txtMsg;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        dbHelper = new DatabaseHelper(this, DATABASE_NAME, null,
                DATABASE_VERSION);

        txtMsg = (TextView) this.findViewById(R.id.txtMsg);

        Button btn1 = (Button) this.findViewById(R.id.btn1);
        btn1.setText("创建表");
        btn1.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                CreateTable();
            }
        });

        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setText("插入 3 条记录");
        btn2.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                insertItem();
            }
        });

        Button btn3 = (Button) this.findViewById(R.id.btn3);
        btn3.setText("删除全部记录");
        btn3.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                deleteItem();
            }
        });

        Button btn4 = (Button) this.findViewById(R.id.btn4);
        btn4.setText("更新指定数据");
        btn4.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                updateItem();
            }
        });

        Button btn5 = (Button) this.findViewById(R.id.btn5);
        btn5.setText("显示全部数据");
        btn5.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                showItems();
            }
        });

        Button btn6 = (Button) this.findViewById(R.id.btn6);
        btn6.setText("删除表");
        btn6.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                dropTable();
            }
        });
    }

    // 创建数据表
    private void CreateTable() {
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME
                + " (ID INTEGER PRIMARY KEY, Name VARCHAR, Age INTEGER);";
        try {
            db.execSQL(sql);
            txtMsg.append("数据表成功创建\n");
        } catch (SQLException ex) {
            txtMsg.append("数据表创建错误\n" + ex.toString() + "\n");
        }
    }

    // 插入数据
    private void insertItem() {
        SQLiteDatabase db = dbHelper.getWritableDatabase();

        try {
            Random random = new Random();
            for (int i = 0; i < 3; i++) {
                String sql = "insert into " + TABLE_NAME
                        + " (name, age) values ('name" + String.valueOf(i)
                        + "', " + random.nextInt() + ")";
                // execSQL() - 执行指定的 sql
                db.execSQL(sql);
            }
            txtMsg.append("成功插入 3 条数据\n");
        } catch (SQLException ex) {
            txtMsg.append("插入数据失败\n" + ex.toString() + "\n");
        }
    }

    // 删除数据
    private void deleteItem() {
        try {
            SQLiteDatabase db = dbHelper.getWritableDatabase();
            db.delete(TABLE_NAME, " id < 999999", null);
            txtMsg.append("成功删除数据\n");
        } catch (SQLException e) {
            txtMsg.append("删除数据失败\n");
        }
    }

    // 更新数据
    private void updateItem() {
        SQLiteDatabase db = dbHelper.getWritableDatabase();

        try {
            ContentValues values = new ContentValues();
            values.put("name", "批量更新后的名字");

            db.update(TABLE_NAME, values, "id", new String[] { "3" });
            txtMsg.append("成功更新数据\n");
        } catch (SQLException e) {
            txtMsg.append("更新数据失败\n");
        }
    }

    // 查询数据
    private void showItems() {
        SQLiteDatabase db = dbHelper.getReadableDatabase();

        try {
            String[] column = { "id", "name", "age" };
            Cursor cursor = db.query(TABLE_NAME, column, null, null, null,
                    null, null);
            Integer num = cursor.getCount();
            txtMsg.append("共 " + Integer.toString(num) + " 条记录\n");
            cursor.moveToFirst();

            while (cursor.getPosition() != cursor.getCount()) {
                txtMsg.append(Integer.toString(cursor.getPosition()) + ","
                        + String.valueOf(cursor.getString(0)) + ","
                        + cursor.getString(1) + ","
                        + String.valueOf(cursor.getString(2)) + "\n");
                cursor.moveToNext();
            }
        } catch (SQLException ex) {
            txtMsg.append("读取数据失败\n" + ex.toString() + "\n");
        }
    }

    // 删除数据表
    private void dropTable() {
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        String sql = "DROP TABLE IF EXISTS " + TABLE_NAME;
        try {
            db.execSQL(sql);
            txtMsg.append("数据表删除成功\n");
        } catch (SQLException ex) {
            txtMsg.append("数据表删除错误\n" + ex.toString() + "\n");
        }
    }
}

2、ContentProvider 的 Demo
MyUser.java

代码

package com.webabcd.contentprovider;

import android.net.Uri;
import android.provider.BaseColumns;

// 自定义 ContentProvider 所需的实体类
public class MyUser {

    // 必须要有 _id 字段。本例中 BaseColumn 类中已经包含了 _id 字段
    public static final class User implements BaseColumns {

        // 定义 CONTENT_URI
        public static final Uri CONTENT_URI = Uri.parse("content://com.webabcd.MyContentProvider");

        // 表数据列
        public static final String USER_NAME = "USER_NAME";
    }
}

MyContentProvider.java

代码

package com.webabcd.contentprovider;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import org.apache.http.util.EncodingUtils;

import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;

// 继承 ContentProvider 以实现自定义的 ContentProvider（基于文件的信息存储）
public class MyContentProvider extends ContentProvider {

    private File file;
    private FileOutputStream out;
    private FileInputStream in;

    // ContentProvider 的删除数据接口
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public String getType(Uri uri) {
        // TODO Auto-generated method stub
        return null;
    }

    // ContentProvider 的插入数据接口
    @Override
    public Uri insert(Uri uri, ContentValues values) {

        try {
            out = new FileOutputStream(file);
            out.write(values.getAsString(MyUser.User.USER_NAME).getBytes());
            out.close();

            int rowId = 0;
            Uri rowUri = ContentUris.appendId(
                    MyUser.User.CONTENT_URI.buildUpon(), rowId).build();
            getContext().getContentResolver().notifyChange(rowUri, null);

            return rowUri;
        } catch (Exception e) {
            return null;
        }
    }

    // 创建用于保存信息的文件
    @Override
    public boolean onCreate() {
        try {
            // 每个包中应用程序的私有目录为：/data/data/包名/
            // SD 卡目录为：/sdcard
            file = new File("/data/data/com.webabcd.contentprovider/",
                    "demo.txt");
            if (!file.exists())
                file.createNewFile();

            return true;
        } catch (Exception ex) {
            return false;
        }
    }

    // ContentProvider 的查询数据接口
    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {

        String content;

        try {
            in = new FileInputStream(file);
            int length = (int) file.length();
            byte[] buffer = new byte[length];
            in.read(buffer, 0, length);
            content = EncodingUtils.getString(buffer, "UTF-8");
            in.close();

            String[] columns = new String[] { MyUser.User._ID, MyUser.User.USER_NAME };
            MatrixCursor cur = new MatrixCursor(columns);
            String[] values = new String[] { "0", content };
            cur.moveToFirst();
            cur.addRow(values);

            return cur;
        } catch (Exception e) {
            return null;
        }
    }

    // ContentProvider 的更新数据接口
    @Override
    public int update(Uri uri, ContentValues values, String selection,
            String[] selectionArgs) {
        // TODO Auto-generated method stub
        return 0;
    }
}

Main.java

代码

package com.webabcd.contentprovider;

import java.util.Random;

import android.app.Activity;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Contacts;
import android.provider.Contacts.People;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

/*
* 几个常用的系统内置的 ContentProvider 如下：
* content://media/internal/images  这个URI将返回设备上存储的所有图片
* content://contacts/people/ 这个URI将返回设备上的所有联系人信息
* content://contacts/people/45 这个URI返回单个结果（联系人信息中ID为45的联系人记录）
*/
public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button btn1 = (Button) this.findViewById(R.id.btn1);
        btn1.setText("新增联系人记录");
        btn1.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                Random random = new Random();
                insertRecords("name" + String.valueOf(random.nextInt()), String
                        .valueOf(random.nextInt()));
            }
        });

        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setText("查看联系人记录");
        btn2.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                displayRecords();
            }
        });

        Button btn3 = (Button) this.findViewById(R.id.btn3);
        btn3.setText("清除联系人记录");
        btn3.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                deleteRecords();
            }
        });

        Button btn4 = (Button) this.findViewById(R.id.btn4);
        btn4.setText("更新联系人记录");
        btn4.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                // 此处只是演示，id 来自 People._ID ，可参见 displayRecords() 是如何获取 id 的
                int id = 0;
                updateRecord(id, "修改后的name");
            }
        });

        Button btn5 = (Button) this.findViewById(R.id.btn5);
        btn5.setText("新增记录到 MyContentProvider");
        btn5.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                insertRecord2MyContentProvider("webabcd");
            }
        });

        Button btn6 = (Button) this.findViewById(R.id.btn6);
        btn6.setText("获取记录从 MyContentProvider");
        btn6.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                displayRecord2MyContentProvider();
            }
        });
    }

    // 调用 ContentProvider 的插入接口
    private void insertRecords(String name, String phoneNum) {
        ContentValues values = new ContentValues();
        values.put(People.NAME, name);
        Uri uri = getContentResolver().insert(People.CONTENT_URI, values);
        Log.d("MyDebug", uri.toString());
        Uri numberUri = Uri.withAppendedPath(uri,
                People.Phones.CONTENT_DIRECTORY);
        Log.d("MyDebug", numberUri.toString());

        values.clear();
        values.put(Contacts.Phones.TYPE, People.Phones.TYPE_MOBILE);
        values.put(People.NUMBER, phoneNum);
        getContentResolver().insert(numberUri, values);
    }

    // 调用 ContentProvider 的查询接口
    private void displayRecords() {
        String[] columns = new String[] { People._ID, People.NAME,
                People.NUMBER };
        Uri contacts = People.CONTENT_URI;
        Log.d("MyDebug", contacts.toString());
        Cursor cur = managedQuery(contacts, columns, // 要返回的数据字段
                null, // WHERE子句
                null, // WHERE 子句的参数
                null // Order-by子句
        );

        if (cur.moveToFirst()) {
            String id = null;
            String name = null;
            String phoneNo = null;
            while (cur.getPosition() != cur.getCount()) {
                id = cur.getString(cur.getColumnIndex(People._ID));
                name = cur.getString(cur.getColumnIndex(People.NAME));
                phoneNo = cur.getString(cur.getColumnIndex(People.NUMBER));

                Toast.makeText(this, id + " / " + name + " / " + phoneNo,
                        Toast.LENGTH_SHORT).show();
                cur.moveToNext();
            }
        }
    }

    // 调用 ContentProvider 的删除接口
    private void deleteRecords() {
        Uri uri = People.CONTENT_URI;
        Log.d("MyDebug", uri.toString());
        getContentResolver().delete(uri, null, null);
        // getContentResolver().delete(uri, "NAME=" + "'name'", null);
    }

    // 调用 ContentProvider 的更新接口
    private void updateRecord(int recordNo, String name) {
        Uri uri = ContentUris.withAppendedId(People.CONTENT_URI, recordNo);
        Log.d("MyDebug", uri.toString());
        ContentValues values = new ContentValues();
        values.put(People.NAME, name);
        getContentResolver().update(uri, values, null, null);
    }


    // 调用自定义 ContentProvider 的插入接口
    private void insertRecord2MyContentProvider(String name) {
        ContentValues values = new ContentValues();
        values.put(MyUser.User.USER_NAME, name);
        getContentResolver().insert(MyUser.User.CONTENT_URI, values);

    }

    // 调用自定义 ContentProvider 的查询接口
    private void displayRecord2MyContentProvider() {
        String[] columns = new String[] { MyUser.User.USER_NAME };
        Uri uri = MyUser.User.CONTENT_URI;
        Cursor cur = managedQuery(uri, columns, null, null, null);

        while (cur.getPosition() != cur.getCount()) {
            String id = cur.getString(cur.getColumnIndex(People._ID));
            String name = cur.getString(cur.getColumnIndex(MyUser.User.USER_NAME));
            Toast.makeText(this,
                    id + " / " + name,
                    Toast.LENGTH_SHORT).show();
            cur.moveToNext();
        }
    }
}

AndroidManifest.xml

代码

xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.webabcd.contentprovider"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Main"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>


        <provider android:name="MyContentProvider" android:authorities="com.webabcd.MyContentProvider" />
    application>
    <uses-permission android:name="android.permission.WRITE_CONTACTS">uses-permission>
    <uses-permission android:name="android.permission.READ_CONTACTS">uses-permission>
    <uses-sdk android:minSdkVersion="3" />
manifest>

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系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView, ExpandableList

webabcd — Wed, 27 Jan 2010 01:01:00 GMT

阅读: 1069 评论: 0 作者: webabcd 发表于 2010-01-27 09:01 原文链接

系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView, ExpandableList

作者：webabcd

介绍
在 Android 中使用各种控件(View)

TextSwitcher - 文字转换器控件（改变文字时增加一些动画效果）
Gallery - 缩略图浏览器控件
ImageSwitcher - 图片转换器控件（改变图片时增加一些动画效果）
GridView - 网格控件
ListView - 列表控件
ExpandableList - 支持展开/收缩功能的列表控件

1、TextSwitcher 的 Demo
textswitcher.xml

代码

_TextSwitcher.java

代码

package com.webabcd.view;

import java.util.Random;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher;

public class _TextSwitcher extends Activity implements ViewSwitcher.ViewFactory {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.textswithcer);

        setTitle("TextSwithcer");

        final TextSwitcher switcher = (TextSwitcher) findViewById(R.id.textSwitcher);
        // 指定转换器的 ViewSwitcher.ViewFactory
        switcher.setFactory(this);

        // 设置淡入和淡出的动画效果
        Animation in = AnimationUtils.loadAnimation(this, android.R.anim.fade_in);
        Animation out = AnimationUtils.loadAnimation(this, android.R.anim.fade_out);
        switcher.setInAnimation(in);
        switcher.setOutAnimation(out);

        // 单击一次按钮改变一次文字
        Button btnChange = (Button) this.findViewById(R.id.btnChange);
        btnChange.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switcher.setText(String.valueOf(new Random().nextInt()));
            }
        });
    }

    // 重写 ViewSwitcher.ViewFactory 的 makeView()，返回一个 View
    @Override
    public View makeView() {
        TextView textView = new TextView(this);
        textView.setTextSize(36);
        return textView;
    }
}

2、Gallery 的 Demo
gallery.xml

代码

_Gallery.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.Gallery.LayoutParams;

public class _Gallery extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.gallery);

        setTitle("Gallery");

        Gallery gallery = (Gallery) findViewById(R.id.gallery);
        // 为缩略图浏览器指定一个适配器
        gallery.setAdapter(new ImageAdapter(this));
        // 响应在缩略图列表上选中某个缩略图后的事件
        gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView parent, View v,
                    int position, long id) {
                Toast.makeText(_Gallery.this, String.valueOf(position), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView arg0) {

            }
        });
    }

    // 继承 BaseAdapter 用以实现自定义的图片适配器
    public class ImageAdapter extends BaseAdapter {

        private Context mContext;

        public ImageAdapter(Context context) {
            mContext = context;
        }

        public int getCount() {
            return mThumbIds.length;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView image = new ImageView(mContext);

            image.setImageResource(mThumbIds[position]);
            image.setAdjustViewBounds(true);
            image.setLayoutParams(new Gallery.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

            return image;
        }
    }

    // 需要显示的图片集合
    private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
            R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };
}

3、ImageSwitcher 的 Demo
imageswitcher.xml

代码

_ImageSwitcher.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;
import android.widget.Gallery.LayoutParams;

// 图片转换器的使用基本同文字转换器
// 以下是一个用 ImageSwitcher + Gallery 实现的经典的图片浏览器的 Demo
public class _ImageSwitcher extends Activity implements
        ViewSwitcher.ViewFactory {

    private ImageSwitcher mSwitcher;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.imageswithcer);

        setTitle("ImageSwithcer");

        mSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
        mSwitcher.setFactory(this);
        mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in));
        mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out));

        Gallery gallery = (Gallery) findViewById(R.id.gallery);
        gallery.setAdapter(new ImageAdapter(this));
        gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView parent, View v,
                    int position, long id) {
                mSwitcher.setImageResource(mImageIds[position]);
            }

            @Override
            public void onNothingSelected(AdapterView arg0) {

            }
        });
    }

    public class ImageAdapter extends BaseAdapter {

        private Context mContext;

        public ImageAdapter(Context context) {
            mContext = context;
        }

        public int getCount() {
            return mThumbIds.length;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView image = new ImageView(mContext);

            image.setImageResource(mThumbIds[position]);
            image.setAdjustViewBounds(true);
            image.setLayoutParams(new Gallery.LayoutParams(
                    LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

            return image;
        }
    }

    private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
            R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };

    private Integer[] mImageIds = { R.drawable.icon01, R.drawable.icon02,
            R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };

    @Override
    public View makeView() {
        ImageView image = new ImageView(this);
        image.setMinimumHeight(200);
        image.setMinimumWidth(200);
        image.setScaleType(ImageView.ScaleType.FIT_CENTER);
        image.setLayoutParams(new ImageSwitcher.LayoutParams(
                LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        return image;
    }
}

4、GridView 的 Demo
gridview.xml

代码

xml version="1.0" encoding="utf-8"?>

<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridView" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:padding="10px"
    android:verticalSpacing="10px" android:horizontalSpacing="10px"
    android:numColumns="auto_fit" android:columnWidth="60px"
    android:stretchMode="columnWidth" android:gravity="center">
GridView>

_GridView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class _GridView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.gridview);

        setTitle("GridView");

        GridView gridView = (GridView) findViewById(R.id.gridView);
        // 指定网格控件的适配器为自定义的图片适配器
        gridView.setAdapter(new ImageAdapter(this));
    }

    // 自定义的图片适配器
    public class ImageAdapter extends BaseAdapter {

        private Context mContext;

        public ImageAdapter(Context context) {
            mContext = context;
        }

        public int getCount() {
            return mThumbIds.length;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imageView;
            if (convertView == null) {
                imageView = new ImageView(mContext);
                imageView.setLayoutParams(new GridView.LayoutParams(48, 48));
                imageView.setAdjustViewBounds(false);
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(5, 5, 5, 5);
            } else {
                imageView = (ImageView) convertView;
            }

            imageView.setImageResource(mThumbIds[position]);

            return imageView;
        }

        // 网格控件所需图片数据的数据源
        private Integer[] mThumbIds = { R.drawable.icon01, R.drawable.icon02,
                R.drawable.icon03, R.drawable.icon04, R.drawable.icon05 };
    }
}

5、ListView 的 Demo
main_list_adapter.xml

代码

xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:id="@+id/text" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:textSize="16sp">
    TextView>

LinearLayout>

MainListAdapter.java

代码

package com.webabcd.view;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

// 继承 BaseAdapter 以实现自定义的列表适配器
public class MainListAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private List<String> mData;

    public MainListAdapter(Context context, List<String> data) {
        mInflater = LayoutInflater.from(context);
        mData = data;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        return mData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        TextView text;

        if (convertView == null) {
            // 指定一个 layout 作为自定义列表适配器的 layout
            convertView = mInflater.inflate(R.layout.main_list_adapter, null);
            text = (TextView) convertView.findViewById(R.id.text);
            convertView.setTag(text);
        } else {
            text = (TextView) convertView.getTag();
        }

        String mItem = mData.get(position);
        text.setText(mItem);

        return convertView;
    }
}

Main.java

代码

package com.webabcd.view;

import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

// 此处要继承 ListActivity ，用以实现 ListView 的功能
public class Main extends ListActivity {

    private List<String> mData;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setTheme(android.R.style.Theme_Light);
        setContentView(R.layout.main);
        mData = getData();

        // 使用自定义的列表适配器来展现数据
        MainListAdapter adapter = new MainListAdapter(this, mData);

        // 如需使用系统内置的列表适配器，则可以使用类似如下的方法
        // ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1, mData);

        this.setListAdapter(adapter);
    }

    // ListView 的数据源
    private List<String> getData()    {
        List<String> items = new ArrayList<String>();

        items.add("TextView");
        items.add("Button");
        items.add("ImageButton");
        items.add("ImageView");
        items.add("CheckBox");
        items.add("RadioButton");
        items.add("AnalogClock");
        items.add("DigitalClock");
        items.add("DatePicker");
        items.add("TimePicker");
        items.add("ToggleButton");
        items.add("EditText");
        items.add("ProgressBar");
        items.add("SeekBar");
        items.add("AutoCompleteTextView");
        items.add("MultiAutoCompleteTextView");
        items.add("ZoomControls");
        items.add("Include");
        items.add("VideoView");
        items.add("WebView");
        items.add("RatingBar");
        items.add("Tab");
        items.add("Spinner");
        items.add("Chronometer");
        items.add("ScrollView");
        items.add("TextSwitcher");
        items.add("ListView");
        items.add("Gallery");
        items.add("ImageSwitcher");
        items.add("GridView");
        items.add("ExpandableList");

        return items;
    }

    // ListView 中某项被选中后的逻辑
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        Intent intent = new Intent();
        intent.setClassName(this, "com.webabcd.view._" + mData.get(position));

        startActivityForResult(intent, 0);
    }
}

6、ExpandableList 的 Demo
_ExpandableList.java

代码

package com.webabcd.view;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

// ExpandableList - 可展开/收缩列表
// 继承 ExpandableListActivity 以实现列表的可展开/收缩的功能
public class _ExpandableList extends ExpandableListActivity {

    private ExpandableListAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        setTitle("ExpandableList");

        mAdapter = new MyExpandableListAdapter();
        setListAdapter(mAdapter);
        registerForContextMenu(this.getExpandableListView());
    }

    // 为列表的每一项创建上下文菜单（即长按后呼出的菜单）
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        menu.setHeaderTitle("ContextMenu");
        menu.add(0, 0, 0, "ContextMenu");
    }

    // 单击上下文菜单后的逻辑
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();
        String title = ((TextView) info.targetView).getText().toString();

        int type = ExpandableListView.getPackedPositionType(info.packedPosition);
        if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
            int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
            int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);

            Toast.makeText(this, title + " - Group Index: " + groupPos + " Child Index: " + childPos, Toast.LENGTH_SHORT).show();

            return true;
        } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
            int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
            Toast.makeText(this, title + " - Group Index: " + groupPos, Toast.LENGTH_SHORT).show();

            return true;
        }

        return false;
    }

    public class MyExpandableListAdapter extends BaseExpandableListAdapter {

        // 父列表数据
        private String[] groups =
        {
            "group1",
            "group2",
            "group3",
            "group4"
        };
        // 子列表数据
        private String[][] children =
        {
            { "child1" },
            { "child1", "child2" },
            { "child1", "child2", "child3" },
            { "child1", "child2", "child3", "child4" }
        };

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return children[groupPosition][childPosition];
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return children[groupPosition].length;
        }

        // 取子列表中的某一项的 View
        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            TextView textView = getGenericView();
            textView.setText(getChild(groupPosition, childPosition).toString());
            return textView;
        }

        @Override
        public Object getGroup(int groupPosition) {
            return groups[groupPosition];
        }

        @Override
        public int getGroupCount() {
            return groups.length;
        }

        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }

        // 取父列表中的某一项的 View
        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            TextView textView = getGenericView();
            textView.setText(getGroup(groupPosition).toString());
            return textView;
        }

        @Override
        public boolean hasStableIds() {
            return true;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }

        // 获取某一项的 View 的逻辑
        private TextView getGenericView() {
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, 48);
            TextView textView = new TextView(_ExpandableList.this);
            textView.setLayoutParams(lp);
            textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
            textView.setPadding(32, 0, 0, 0);
            return textView;
        }
    }
}

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系出名门Android(7) - 控件(View)之ZoomControls, Include, VideoView, WebView, RatingBar, Tab, Spinner, Chronometer, ScrollView

webabcd — Tue, 26 Jan 2010 00:41:00 GMT

阅读: 714 评论: 0 作者: webabcd 发表于 2010-01-26 08:41 原文链接

系出名门Android(7) - 控件(View)之ZoomControls, Include, VideoView, WebView, RatingBar, Tab, Spinner, Chronometer, ScrollView

作者：webabcd

介绍
在 Android 中使用各种控件(View)

ZoomControls - 放大/缩小按钮控件
Include - 整合控件
VideoView - 视频播放控件
WebView - 浏览器控件
RatingBar - 评分控件
Tab - 选项卡控件
Spinner - 下拉框控件
Chronometer - 计时器控件
ScrollView - 滚动条控件

1、ZoomControls 的 Demo
zoomcontrols.xml

代码

_ZoomControls.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;
import android.widget.ZoomControls;

public class _ZoomControls extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.zoomcontrols);

        setTitle("ZoomControls");

        ZoomControls zoomControls = (ZoomControls) this.findViewById(R.id.zoomControls);
        // setOnZoomInClickListener() - 响应单击放大按钮的事件
        zoomControls.setOnZoomInClickListener(new OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(_ZoomControls.this, "单击了放大按钮", Toast.LENGTH_SHORT).show();
            }
        });

        // setOnZoomOutClickListener() - 响应单击缩小按钮的事件
        zoomControls.setOnZoomOutClickListener(new OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(_ZoomControls.this, "单击了缩小按钮", Toast.LENGTH_SHORT).show();
            }
        });

    }
}

2、Include 的 Demo
include.xml

代码

include_1.xml

代码

xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:text="TextView01" android:layout_width="wrap_content"
android:layout_height="wrap_content">
TextView>

include_2.xml

代码

xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:text="TextView02" android:layout_width="wrap_content"
android:layout_height="wrap_content">
TextView>

_Include.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _Include extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.include);

        setTitle("Include");
    }
}

3、VideoView 的 Demo
videoview.xml

代码

_VideoView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;

public class _VideoView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.videoview);

        setTitle("VideoView");

        VideoView videoView = (VideoView) findViewById(R.id.videoView);

        // 指定需要播放的视频的地址
        videoView.setVideoURI(Uri.parse("android.resource://com.webabcd.view/" + R.raw.demo));
        // videoView.setVideoPath();

        // 设置播放器的控制条
        videoView.setMediaController(new MediaController(this));
        // 开始播放视频
        videoView.start();
    }
}

4、WebView 的 Demo
webview.xml

代码

_WebView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;

public class _WebView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.webview);

        setTitle("WebView");

        WebView webView = (WebView) findViewById(R.id.webView);

        // 配置浏览器，使其可支持 JavaScript
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);

        // 清除浏览器缓存
        webView.clearCache(true);
        // 指定浏览器需要解析的 url 地址
        webView.loadUrl("http://webabcd.cnblogs.com/");
        // 指定浏览器需要解析的 html 数据
        // webView.loadData("http://webabcd.cnblogs.com/'>webabcd", "text/html", "utf-8");
    }
}

5、RatingBar 的 Demo
ratingbar.xml

代码

_RatingBar.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.TextView;

public class _RatingBar extends Activity implements RatingBar.OnRatingBarChangeListener {

    private RatingBar mRatingBar;
    private TextView mTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.ratingbar);

        setTitle("RatingBar");

        mTextView = (TextView) findViewById(R.id.textView);
        mRatingBar = (RatingBar) findViewById(R.id.ratingBar);

        // setOnRatingBarChangeListener() - 响应评分值发生改变的事件
        mRatingBar.setOnRatingBarChangeListener(this);
    }

    @Override
    public void onRatingChanged(RatingBar ratingBar, float rating,
            boolean fromUser) {
        mTextView.setText(String.valueOf(rating));
    }
}

6、Tab 的 Demo
tab.xml

代码

xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent">


    <TextView android:id="@+id/view1" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:text="tab1 content" />


    <TextView android:id="@+id/view2" android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:text="tab2 content" />

FrameLayout>

_Tab.java

代码

package com.webabcd.view;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.TabHost;

// 实现 Tab 功能的话要继承 TabActivity
public class _Tab extends TabActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        TabHost tabHost = getTabHost();
        LayoutInflater.from(this).inflate(R.layout.tab, tabHost.getTabContentView(), true);

        // Tab 1 的内容
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1")
                .setContent(R.id.view1));

        // Tab 2 的内容（设置了 Tab 图片）
        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("tab2", getResources().getDrawable(R.drawable.icon01))
                .setContent(R.id.view2));

        // Tab 3 的内容（设置 Tab 的内容为指定的 Activity）
        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("tab3")
                .setContent(new Intent(this, _TextView.class)));

    }
}

7、Spinner 的 Demo
spinner.xml

代码

_Spinner.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class _Spinner extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.spinner);

        setTitle("Spinner");

        Spinner spinner = (Spinner) findViewById(R.id.spinner);

        // 设置下拉框控件的标题文本
        spinner.setPrompt("请选择");
        // 实例化适配器，指定显示格式及数据源
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
                this, R.array.colors, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        // setOnItemSelectedListener() - 响应下拉框的选中值发生变化的事件
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView arg0, View arg1,
                    int arg2, long arg3) {
                TextView textView = (TextView)_Spinner.this.findViewById(R.id.textView);
                textView.setText(((TextView)arg1).getText());
            }

            @Override
            public void onNothingSelected(AdapterView arg0) {

            }
        });
    }
}

8、Chronometer 的 Demo
chronometer.xml

代码

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">


    <Chronometer android:id="@+id/chronometer"
        android:layout_width="wrap_content" android:layout_height="wrap_content" />

    <Button android:id="@+id/btnStart" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="开始计时">
        <requestFocus />
    Button>

    <Button android:id="@+id/btnStop" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="停止计时">
    Button>

    <Button android:id="@+id/btnReset" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="计时器复位">
    Button>

LinearLayout>

_Chronometer.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;

public class _Chronometer extends Activity {

    private Chronometer mChronometer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.chronometer);

        setTitle("Chronometer");

        Button button;

        mChronometer = (Chronometer) findViewById(R.id.chronometer);
        // 设置计时器所显示的时间格式
        mChronometer.setFormat("计时：(%s)");

        button = (Button) findViewById(R.id.btnStart);
        button.setOnClickListener(mStartListener);

        button = (Button) findViewById(R.id.btnStop);
        button.setOnClickListener(mStopListener);

        button = (Button) findViewById(R.id.btnReset);
        button.setOnClickListener(mResetListener);
    }

    View.OnClickListener mStartListener = new OnClickListener() {
        public void onClick(View v) {
            // 启动计时器
            mChronometer.start();
        }
    };

    View.OnClickListener mStopListener = new OnClickListener() {
        public void onClick(View v) {
            // 暂停计时器
            mChronometer.stop();
        }
    };

    View.OnClickListener mResetListener = new OnClickListener() {
        public void onClick(View v) {
            // 复位计时器，即停止计时器
            mChronometer.setBase(SystemClock.elapsedRealtime());
        }
    };
}

9、ScrollView 的 Demo
scrollview.xml

代码

_ScrollView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class _ScrollView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.scrollview);

        setTitle("ScrollView");

        TextView textView = (TextView)this.findViewById(R.id.textView);
        textView.setText("a\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na\na");
    }
}

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系出名门Android(6) - 控件(View)之DatePicker, TimePicker, ToggleButton, EditText, ProgressBar, SeekBar, AutoComplete

webabcd — Mon, 25 Jan 2010 00:44:00 GMT

阅读: 761 评论: 0 作者: webabcd 发表于 2010-01-25 08:44 原文链接

系出名门Android(6) - 控件(View)之DatePicker, TimePicker, ToggleButton, EditText, ProgressBar, SeekBar, AutoCompleteTextView, MultiAutoCompleteTextView

作者：webabcd

介绍
在 Android 中使用各种控件(View)

DatePicker - 日期选择控件
TimePicker - 时间选择控件
ToggleButton - 双状态按钮控件
EditText - 可编辑文本控件
ProgressBar - 进度条控件
SeekBar - 可拖动的进度条控件
AutoCompleteTextView - 支持自动完成功能的可编辑文本控件
MultiAutoCompleteTextView - 支持自动完成功能的可编辑文本控件，允许输入多值（多值之间会自动地用指定的分隔符分开）

1、DatePicker 的 Demo
datepicker.xml

代码

_DatePicker.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _DatePicker extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.datepicker);

        // 具体的应用可参见对话框中的示例
        setTitle("DatePicker");
    }
}

2、TimePicker 的 Demo
timepicker.xml

代码

_TimePicker.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _TimePicker extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.timepicker);

        // 具体的应用可参见对话框中的示例
        setTitle("TimePicker");
    }
}

3、ToggleButton 的 Demo
togglebutton.xml

代码

_ToggleButton.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.ToggleButton;

public class _ToggleButton extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.togglebutton);

        setTitle("ToggleButton");

        final ToggleButton btn = (ToggleButton) this.findViewById(R.id.toggleButton);
        // setOnClickListener() - 响应按钮的鼠标单击事件
        btn.setOnClickListener(new Button.OnClickListener(){
            @Override
            public void onClick(View v) {
                TextView txt = (TextView) _ToggleButton.this.findViewById(R.id.textView);
                // ToggleButton.isChecked() - 双状态按钮的按钮状态
                txt.setText("按钮状态：" + String.valueOf(btn.isChecked()));
            }
        });
    }
}

4、EditText 的 Demo
edittext.xml

代码

_EditText.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.EditText;

public class _EditText extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.edittext);

        setTitle("EditText");

        EditText txt = (EditText) this.findViewById(R.id.editText);
        txt.setText("我可编辑");
    }
}

5、ProgressBar 的 Demo
progressbar.xml

代码

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">




    <ProgressBar android:id="@+android:id/progress_large"
        style="?android:attr/progressBarStyleLarge" android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <ProgressBar android:id="@+android:id/progress"
        android:layout_width="wrap_content" android:layout_height="wrap_content" />
    <ProgressBar android:id="@+android:id/progress_small"
        style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


    <ProgressBar android:id="@+id/progress_horizontal"
        style="?android:attr/progressBarStyleHorizontal" android:layout_width="200px"
        android:layout_height="wrap_content" android:max="100"
        android:progress="50" android:secondaryProgress="75" />

LinearLayout>

_ProgressBar.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;

// 另见对话框中的进度条
public class _ProgressBar extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        // 设置特性以允许在应用程序的标题栏上显示进度条（条状）
        requestWindowFeature(Window.FEATURE_PROGRESS);
        // 设置特性以允许在应用程序的标题栏上显示进度条（圆圈状）
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

        this.setContentView(R.layout.progressbar);

        setTitle("ProgressBar");

        // 在标题栏上显示进度条（条状）
        setProgressBarVisibility(true);
        // 在标题栏上显示进度条（圆圈状）
        setProgressBarIndeterminateVisibility(true);

        // 指定进度条的进度
        setProgress(50 * 100);
        setSecondaryProgress(75 * 100);
    }
}

6、SeekBar 的 Demo
seekbar.xml

代码

_SeekBar.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;

public class _SeekBar extends Activity implements
        SeekBar.OnSeekBarChangeListener {

    SeekBar mSeekBar;
    TextView mProgressText;
    TextView mTrackingText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.seekbar);

        setTitle("SeekBar");

        mSeekBar = (SeekBar) findViewById(R.id.seekBar);
        // setOnSeekBarChangeListener() - 响应拖动进度条事件
        mSeekBar.setOnSeekBarChangeListener(this);

        mProgressText = (TextView) findViewById(R.id.progress);
        mTrackingText = (TextView) findViewById(R.id.tracking);
    }

    // 拖动进度条后，进度发生改变时的回调事件
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromTouch) {
        mProgressText.setText(progress + "%");
    }

    // 拖动进度条前开始跟踪触摸
    public void onStartTrackingTouch(SeekBar seekBar) {
        mTrackingText.setText("开始跟踪触摸");
    }

    // 拖动进度条后停止跟踪触摸
    public void onStopTrackingTouch(SeekBar seekBar) {
        mTrackingText.setText("停止跟踪触摸");
    }

}

7、AutoCompleteTextView 的 Demo
autocompletetextview.xml

代码

_AutoCompleteTextView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class _AutoCompleteTextView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.autocompletetextview);

        setTitle("AutoCompleteTextView");

        // 实例化适配器，指定显示格式及数据源
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                this,
                android.R.layout.simple_dropdown_item_1line,
                ary);
        AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.editText);
        // 指定自动完成控件的适配器
        textView.setAdapter(adapter);
    }

    // 自动完成控件的所需数据的数据源
    private String[] ary = new String[] {
        "abc",
        "abcd",
        "abcde",
        "abcdef",
        "abcdefg",
        "hij",
        "hijk",
        "hijkl",
        "hijklm",
        "hijklmn",
    };
}

8、MultiAutoCompleteTextView 的 Demo
multiautocompletetextview.xml

代码

_MultiAutoCompleteTextView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.MultiAutoCompleteTextView;

public class _MultiAutoCompleteTextView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.multiautocompletetextview);

        setTitle("MultiAutoCompleteTextView");

        // 实例化适配器，指定显示格式及数据源
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                this,
                android.R.layout.simple_dropdown_item_1line,
                ary);
        MultiAutoCompleteTextView textView = (MultiAutoCompleteTextView) findViewById(R.id.editText);
        textView.setAdapter(adapter);

        // 设置多个值之间的分隔符，此处为逗号
        textView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
    }

    // 自动完成控件的所需数据的数据源
    private String[] ary = new String[] {
        "abc",
        "abcd",
        "abcde",
        "abcdef",
        "abcdefg",
        "hij",
        "hijk",
        "hijkl",
        "hijklm",
        "hijklmn",
    };
}

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系出名门Android(5) - 控件(View)之TextView, Button, ImageButton, ImageView, CheckBox, RadioButton, AnalogClock, DigitalClock

webabcd — Fri, 22 Jan 2010 01:11:00 GMT

阅读: 843 评论: 0 作者: webabcd 发表于 2010-01-22 09:11 原文链接

系出名门Android(5) - 控件(View)之TextView, Button, ImageButton, ImageView, CheckBox, RadioButton, AnalogClock, DigitalClock

作者：webabcd

介绍
在 Android 中使用各种控件(View)

TextView - 文本显示控件
Button - 按钮控件
ImageButton - 图片按钮控件
ImageView - 图片显示控件
CheckBox - 复选框控件
RadioButton - 单选框控件
AnalogClock - 钟表（带表盘的那种）控件
DigitalClock - 电子表控件

1、TextView 的 Demo
textview.xml

代码

_TextView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class _TextView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.textview);

        // 设置 Activity 的标题
        setTitle("TextView");

        TextView txt = (TextView) this.findViewById(R.id.textView);
        // 设置文本显示控件的文本内容，需要换行的话就用“\n”
        txt.setText("我是 TextView\n显示文字用的");
    }
}

2、Button 的 Demo
button.xml

代码

_Button.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class _Button extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.button);

        setTitle("Button");

        Button btn = (Button) this.findViewById(R.id.button);
        btn.setText("click me");

        // setOnClickListener() - 响应按钮的鼠标单击事件
        btn.setOnClickListener(new Button.OnClickListener(){
            @Override
            public void onClick(View v) {
                TextView txt = (TextView) _Button.this.findViewById(R.id.textView);
                txt.setText("按钮被单击了");
            }
        });
    }
}

3、ImageButton 的 Demo
imagebutton.xml

代码

_ImageButton.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;

public class _ImageButton extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.imagebutton);

        setTitle("ImageButton");

        ImageButton imgButton = (ImageButton) this.findViewById(R.id.imageButton);
        // 设置图片按钮的背景
        imgButton.setBackgroundResource(R.drawable.icon01);

        // setOnClickListener() - 响应图片按钮的鼠标单击事件
        imgButton.setOnClickListener(new Button.OnClickListener(){
            @Override
            public void onClick(View v) {
                TextView txt = (TextView) _ImageButton.this.findViewById(R.id.textView);
                txt.setText("图片按钮被单击了");
            }
        });
    }
}

4、ImageView 的 Demo
imageview.xml

代码

_ImageView.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;

public class _ImageView extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.imageview);

        setTitle("ImageView");

        ImageView imgView = (ImageView) this.findViewById(R.id.imageView);
        // 指定需要显示的图片
        imgView.setBackgroundResource(R.drawable.icon01);
    }
}

5、CheckBox 的 Demo
checkbox.xml

代码

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/textView" />


    <CheckBox android:text="CheckBox01" android:id="@+id/chk1"
        android:layout_width="wrap_content" android:layout_height="wrap_content">CheckBox>
    <CheckBox android:text="CheckBox02" android:id="@+id/chk2"
        android:layout_width="wrap_content" android:layout_height="wrap_content">CheckBox>
    <CheckBox android:text="CheckBox03" android:id="@+id/chk3"
        android:layout_width="wrap_content" android:layout_height="wrap_content">CheckBox>

LinearLayout>

_CheckBox.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;

public class _CheckBox extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.checkbox);

        setTitle("CheckBox");

        CheckBox chk = (CheckBox) this.findViewById(R.id.chk1);
        // setOnCheckedChangeListener() - 响应复选框的选中状态改变事件
        chk.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                TextView txt = (TextView) _CheckBox.this.findViewById(R.id.textView);
                txt.setText("CheckBox01 的选中状态：" + String.valueOf(isChecked));
            }
        });
    }
}

6、RadioButton 的 Demo
radiobutton.xml

代码

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:id="@+id/textView" />


    <RadioGroup android:id="@+id/radioGroup"
        android:layout_width="fill_parent" android:layout_height="fill_parent"
        android:checkedButton="@+id/rad3" android:orientation="horizontal"
        android:gravity="center_vertical|center_horizontal">
        <RadioButton android:text="rad1" android:id="@+id/rad1"
            android:layout_width="wrap_content" android:layout_height="wrap_content">RadioButton>
        <RadioButton android:text="rad2" android:id="@+id/rad2"
            android:layout_width="wrap_content" android:layout_height="wrap_content">RadioButton>
        <RadioButton android:text="rad3" android:id="@+id/rad3"
            android:layout_width="wrap_content" android:layout_height="wrap_content">RadioButton>
    RadioGroup>

LinearLayout>

_RadioButton.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class _RadioButton extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.radiobutton);

        setTitle("RadioButton");

        RadioGroup group = (RadioGroup) this.findViewById(R.id.radioGroup);
        // setOnCheckedChangeListener() - 响应单选框组内的选中项发生变化时的事件
        group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                TextView txt = (TextView) _RadioButton.this.findViewById(R.id.textView);
                txt.setText(((RadioButton)findViewById(checkedId)).getText() + " 被选中");
            }
        });
    }
}

7、AnalogClock 的 Demo
analogclock.xml

代码

_AnalogClock.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _AnalogClock extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.analogclcok);

        setTitle("AnalogClock");
    }
}

8、DigitalClock 的 Demo
digitalclock.xml

代码

_DigitalClock.java

代码

package com.webabcd.view;

import android.app.Activity;
import android.os.Bundle;

public class _DigitalClock extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.digitalclcok);

        setTitle("DigitalClcok");
    }
}

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系出名门Android(4) - 活动(Activity), 服务(Service), 广播(Broadcast), 广播接收器(BroadcastReceiver)

webabcd — Thu, 21 Jan 2010 01:07:00 GMT

阅读: 1236 评论: 0 作者: webabcd 发表于 2010-01-21 09:07 原文链接

系出名门Android(4) - 活动(Activity), 服务(Service), 广播(Broadcast), 广播接收器(BroadcastReceiver)

作者：webabcd

介绍
在 Android 中使用 Activity, Service, Broadcast, BroadcastReceiver

活动(Activity) - 用于表现功能
服务(Service) - 相当于后台运行的 Activity
广播(Broadcast) - 用于发送广播
广播接收器(BroadcastReceiver) - 用于接收广播
Intent - 用于连接以上各个组件，并在其间传递消息

1、演示 Activity 的基本用法，一个 Activity 启动另一个 Activity，启动另一个 Activity 时为其传递参数，被启动的 Activity 返回参数给启动者的 Activity
Main.java

代码

package com.webabcd.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Main extends Activity {

    TextView txt;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.main);

        txt = (TextView) this.findViewById(R.id.txt);
        txt.setText("Activity 1");

        Button btn = (Button) this.findViewById(R.id.btn);
        btn.setText("启动另一个Activity");
        btn.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {

                // 实例化 Intent，指定需要启动的 Activity
                Intent intent = new Intent();
                intent.setClass(Main.this, MyActivity.class);

                // 实例化 Bundle，设置需要传递的参数
                Bundle bundle = new Bundle();
                bundle.putString("name", "webabcd");
                bundle.putDouble("salary", 100.13);

                // 将需要传递的参数赋值给 Intent 对象
                intent.putExtras(bundle);

                // startActivity(intent); // 启动指定的 Intent（不等待返回结果）
                // Main.this.finish();

                // 启动指定的 Intent，并等待返回结果
                // 其中第二个参数如果大于等于零，则返回结果时会回调 onActivityResult() 方法
                startActivityForResult(intent, 0);
            }
        });

        Log.d("MyDebug", "onCreate");
    }

    // 被启动的 Activity 返回结果时的回调函数
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == Activity.RESULT_OK){
            Bundle bundle = data.getExtras();

            String name = bundle.getString("name");
            double salary = bundle.getDouble("salary");

            txt.setText("Activity 1" + "\n名字：" + name + "\n薪水：" + String.valueOf(salary));
        }
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();

        Log.d("MyDebug", "onStart");
    }

    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();

        Log.d("MyDebug", "onStop");
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();

        Log.d("MyDebug", "onRestart");
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();

        Log.d("MyDebug", "onPause");
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

        Log.d("MyDebug", "onResume");
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();

        Log.d("MyDebug", "onDestroy");
    }
}

MyActivity.java

代码

package com.webabcd.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

// 被另一个 Activity 所启动的 Activity
public class MyActivity extends Activity {

    Intent intent;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.main2);

        // 获取启动者传递过来的参数
        intent = this.getIntent();
        Bundle bundle = intent.getExtras();
        String name = bundle.getString("name");
        double salary = bundle.getDouble("salary");

        TextView txt = (TextView) this.findViewById(R.id.txt);
        txt.setText("Activity 2" + "\n名字：" + name + "\n薪水：" + String.valueOf(salary));

        Button btn = (Button) this.findViewById(R.id.btn);
        btn.setText("返回前一个Activity");
        btn.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                // 返回参数给启动者
                MyActivity.this.setResult(Activity.RESULT_OK, intent);
                MyActivity.this.finish();
            }
        });
    }
}

AndroidManifest.xml

代码

xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.webabcd.activity" android:versionCode="1"
    android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Main" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>

        <activity android:name=".MyActivity" android:label="Activity 2" />
    application>
    <uses-sdk android:minSdkVersion="3" />
manifest>

2、Service, Broadcast, BroadcastReceiver 的演示
Main.java

代码

package com.webabcd.service;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

/*
* startService() 和 bindService() 的区别
* startService() - 正常理解就好
* bindService() - 使当前上下文对象（本例中就是 Activity）通过一个 ServiceConnection 对象邦定到指定的 Service 。这样，如果上下文对象销毁了的话，那么其对应的 Service 也会被销毁
*/
public class Main extends Activity implements OnClickListener {

    private TextView txtMsg;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        setTitle("android 之 service");

        this.findViewById(R.id.btnStart).setOnClickListener(this);
        this.findViewById(R.id.btnStop).setOnClickListener(this);
        this.findViewById(R.id.btnBind).setOnClickListener(this);
        this.findViewById(R.id.btnUnbind).setOnClickListener(this);

        txtMsg = (TextView)this.findViewById(R.id.txtMsg);

        // 实例化自定义的 BroadcastReceiver
        receiver = new UpdateReceiver();
        IntentFilter filter = new IntentFilter();
        // 为 BroadcastReceiver 指定 action ，使之用于接收同 action 的广播
        filter.addAction("com.webabcd.service.msg");

        // 以编程方式注册  BroadcastReceiver 。配置方式注册 BroadcastReceiver 的例子见 AndroidManifest.xml 文件
        // 一般在 OnStart 时注册，在 OnStop 时取消注册
        this.registerReceiver(receiver, filter);
        // this.unregisterReceiver(receiver);

    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(Main.this, MyService.class);
        switch (v.getId()) {
        case R.id.btnStart:
            this.startService(intent);
            break;
        case R.id.btnStop:
            this.stopService(intent);
            break;
        case R.id.btnBind:
            this.bindService(intent, conn, Context.BIND_AUTO_CREATE);
            break;
        case R.id.btnUnbind:
            this.unbindService(conn);
            break;
        }
    }

    // bindService() 所需的 ServiceConnection 对象
    private ServiceConnection conn = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName className, IBinder service) {

        }
        @Override
        public void onServiceDisconnected(ComponentName className) {

        }
    };

    private String msg="";
    private UpdateReceiver receiver;
    // 实现一个 BroadcastReceiver，用于接收指定的 Broadcast
    public class UpdateReceiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            msg = intent.getStringExtra("msg");

            txtMsg.append(msg + "\n");
        }

    }
}

MyService.java

代码

package com.webabcd.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

// 演示 Service 的生命周期。具体信息运行程序后在 LogCat 中查看
public class MyService extends Service {

    @Override
    public IBinder onBind(Intent intent) {

        Log.d("MyDebug", "onBind");
        sendMsg("onBind");

        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();

        Log.d("MyDebug", "onCreate");
        sendMsg("onCreate");
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();

        Log.d("MyDebug", "onDestroy");
        sendMsg("onDestroy");
    }

    @Override
    public void onRebind(Intent intent) {
        // TODO Auto-generated method stub
        super.onRebind(intent);

        Log.d("MyDebug", "onRebind");
        sendMsg("onRebind");
    }

    @Override
    public void onStart(Intent intent, int startId) {
        super.onStart(intent, startId);

        Log.d("MyDebug", "onStart");
        sendMsg("onStart");
    }

    @Override
    public boolean onUnbind(Intent intent) {

        Log.d("MyDebug", "onUnbind");
        sendMsg("onUnbind");

        // TODO Auto-generated method stub
        return super.onUnbind(intent);
    }

    // 发送广播信息
    private void sendMsg(String msg){
        // 指定广播目标的 action （注：指定了此 action 的 receiver 会接收此广播）
        Intent intent = new Intent("com.webabcd.service.msg");
        // 需要传递的参数
        intent.putExtra("msg", msg);
        // 发送广播
        this.sendBroadcast(intent);
    }
}

MyBootReceiver.java

代码

package com.webabcd.service;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class MyBootReceiver extends BroadcastReceiver {

    // 用于接收满足条件的 Broadcast（相应的 Broadcast 的注册信息详见 AndroidManifest.xml ，当系统启动完毕后会调用这个广播接收器）
    @Override
    public void onReceive(Context arg0, Intent arg1) {
        Log.d("MyDebug", "onReceive");

        // 启动服务
        Intent service = new Intent(arg0, MyService.class);
        arg0.startService(service);
    }

}

AndroidManifest.xml

代码

xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.webabcd.service" android:versionCode="1"
    android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Main" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>


        <service android:name=".MyService">service>


        <receiver android:name=".MyBootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            intent-filter>
        receiver>
    application>


    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-sdk android:minSdkVersion="3" />
manifest>

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系出名门Android(3) - 对话框(Dialog)和通知(Notification)

webabcd — Wed, 20 Jan 2010 01:02:00 GMT

阅读: 900 评论: 2 作者: webabcd 发表于 2010-01-20 09:02 原文链接

系出名门Android(3) - 对话框(Dialog)和通知(Notification)

作者：webabcd

介绍
在 Android 中种对话框及各种通知效果的应用

常用对话框的使用，弹出式对话框、日期选择对话框、时间选择对话框、进度条对话框
通知（出现在通知列表）和提示性通知（Toast）的演示

1、常用对话框的演示
res/layout/main.xml

代码

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView android:id="@+id/txtMsg" android:layout_width="wrap_content"
        android:layout_height="wrap_content">TextView>

    <Button android:id="@+id/btn1" android:layout_width="wrap_content"
        android:layout_height="wrap_content">Button>
    <Button android:id="@+id/btn2" android:layout_width="wrap_content"
        android:layout_height="wrap_content">Button>
    <Button android:id="@+id/btn3" android:layout_width="wrap_content"
        android:layout_height="wrap_content">Button>
    <Button android:id="@+id/btn4" android:layout_width="wrap_content"
        android:layout_height="wrap_content">Button>
    <Button android:id="@+id/btn5" android:layout_width="wrap_content"
        android:layout_height="wrap_content">Button>
    <Button android:id="@+id/btn6" android:layout_width="wrap_content"
        android:layout_height="wrap_content">Button>

LinearLayout>

res/layout/view.xml

代码

res/values/array.xml

xml version="1.0" encoding="utf-8"?>
<resources>

    <string-array name="ary">
        <item>项目 1item>
        <item>项目 2item>
    string-array>
resources>

Main.java

代码

package com.webabcd.dialog;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.app.TimePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Button;

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 弹出式对话框的 Demo。先调用 Builder()，在 Create()，需要显示对话框的是后再调用 show()
        AlertDialog dialog = new AlertDialog.Builder(this).setTitle("弹出对话框").create();
        dialog.show();

        // 以下是各种对话框的 Demo
        MyButtonClickListener listener = new MyButtonClickListener();
        Button btn1 = (Button) this.findViewById(R.id.btn1);
        btn1.setText("简单的对话框的 Demo");
        btn1.setOnClickListener(listener);

        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setText("包括常用设置的对话框(数据来自 xml)");
        btn2.setOnClickListener(listener);

        Button btn3 = (Button) this.findViewById(R.id.btn3);
        btn3.setText("弹出的对话框的内容是一个 View");
        btn3.setOnClickListener(listener);

        Button btn4 = (Button) this.findViewById(R.id.btn4);
        btn4.setText("日期选择对话框");
        btn4.setOnClickListener(listener);

        Button btn5 = (Button) this.findViewById(R.id.btn5);
        btn5.setText("时间选择对话框");
        btn5.setOnClickListener(listener);

        Button btn6 = (Button) this.findViewById(R.id.btn6);
        btn6.setText("进度条对话框");
        btn6.setOnClickListener(listener);
    }

    class MyButtonClickListener implements View.OnClickListener {
        @Override
        public void onClick(View v) {

            // 具体的对话框的实现可以通过重写 onCreateDialog 完成

            switch (v.getId()) {
            case R.id.btn1:
                Main.this.showDialog(0);
                break;
            case R.id.btn2:
                Main.this.showDialog(1);
                break;
            case R.id.btn3:
                Main.this.showDialog(2);
                break;
            case R.id.btn4:
                Main.this.showDialog(3);
                break;
            case R.id.btn5:
                Main.this.showDialog(4);
                break;
            case R.id.btn6:
                Main.this.showDialog(5);
                break;
            }
        }
    }

    @Override
    public Dialog onCreateDialog(int id) {
        switch (id) {

        case 0:
            // 一个简单的弹出对话框
            return new AlertDialog.Builder(this).setTitle("这是一个简单的弹出对话框的 Demo")
                    .create();

        case 1:
            // 一个相对复杂的弹出对话框
            return new AlertDialog.Builder(this)
                    .setTitle("标题") // 设置标题
                    // .setCustomTitle(View) // 以一个 View 作为标题
                    .setIcon(R.drawable.icon01) // 设置标题图片
                    // .setMessage("信息") // 需要显示的弹出内容
                    .setPositiveButton("确定", new OnClickListener() { // 设置弹框的确认按钮所显示的文本，以及单击按钮后的响应行为
                        @Override
                        public void onClick(DialogInterface a0, int a1) {
                            TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg);
                            txtMsg.append("单击了对话框上的“确认”按钮\n");
                        }
                    })
                    .setItems(R.array.ary, new DialogInterface.OnClickListener() { // 弹框所显示的内容来自一个数组。数组中的数据会一行一行地依次排列
                        public void onClick(DialogInterface dialog,    int which) {
                        }
                    })
                    // 其他常用方法如下
                    // .setMultiChoiceItems(arg0, arg1, arg2)
                    // .setSingleChoiceItems(arg0, arg1, arg2)
                    // .setNeutralButton(arg0, arg1)
                    // .setNegativeButton(arg0, arg1)
                    .create();

        case 2:
            // 弹出对话框为指定的 View 的 Demo
            return new AlertDialog.Builder(this).setTitle("此对话框的内容是一个 View")
                    .setView(this.findViewById(R.layout.view)).create();

        case 3:
            // 弹出日期选择对话框
            Calendar c = Calendar.getInstance();
            return new DatePickerDialog(this, new OnDateSetListener() {
                @Override
                public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                    TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg);
                    txtMsg.append("新设置的日期为：" + String.valueOf(year) + "-"
                            + String.valueOf(monthOfYear) + "-"
                            + String.valueOf(dayOfMonth) + "\n");
                }
            }, c.get(Calendar.YEAR), c.get(Calendar.MONTH), c.get(Calendar.DATE));

        case 4:
            // 弹出时间选择对话框
            Calendar c2 = Calendar.getInstance();
            return new TimePickerDialog(this, new OnTimeSetListener() {
                @Override
                public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                    TextView txtMsg = (TextView) Main.this.findViewById(R.id.txtMsg);
                    txtMsg.append("新设置的时间为："
                            + String.valueOf(hourOfDay) + ":"
                            + String.valueOf(minute) + "\n");
                }

            }, c2.get(Calendar.HOUR), c2.get(Calendar.MINUTE), true);

        case 5:
            // 弹出进度条对话框
            ProgressDialog progress = new ProgressDialog(this);
            progress.setMessage("loading...");
            return progress;

        default:
            return null;
        }
    }
}

2、各种提示效果的演示
res/layout/main.xml

代码

res/layout/view.xml

代码

Main.java

代码

package com.webabcd.notification;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class Main extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 通过 Tost.makeText().show() 来实现提示性的通知效果
        // 短时间的提示性通知的 Demo
        Button btn1 = (Button) this.findViewById(R.id.btn1);
        btn1.setText("短时间提示");
        btn1.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(Main.this, "我是短时间提示", Toast.LENGTH_SHORT).show();
            }
        });

        // 长时间的提示性通知的 Demo
        Button btn2 = (Button) this.findViewById(R.id.btn2);
        btn2.setText("长时间提示");
        btn2.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(Main.this, "我是长时间提示", Toast.LENGTH_LONG).show();
            }
        });

        // 以一个 View 作为提示性通知的 Demo
        Button btn3 = (Button) this.findViewById(R.id.btn3);
        btn3.setText("以一个 View 做提示");
        btn3.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                View view = inflateView(R.layout.view);
                TextView txtMsg = (TextView) view.findViewById(R.id.txtMsg);
                txtMsg.setText("提示内容");

                Toast toast = new Toast(Main.this);
                toast.setView(view);
                toast.setDuration(Toast.LENGTH_LONG);
                toast.show();
            }
        });


        Button btn4 = (Button) this.findViewById(R.id.btn4);
        btn4.setText("发出一个通知（Notification）");
        btn4.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                // 实例化通知管理器
                NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

                // 指定单击通知后所打开的详细的通知页面（单击通知后打开 NotificationView）
                PendingIntent contentIntent = PendingIntent.getActivity(
                        Main.this, 0, new Intent(Main.this,    NotificationView.class), 0);

                // 实例化一个通知，并指定其图标和标题（在提示栏上显示）
                Notification n = new Notification(R.drawable.icon01, "我是滚动的通知信息我是滚动的通知信息我是滚动的通知信息", System.currentTimeMillis());

                // 设置通知的发送人和通知的详细内容（打开提示栏后在通知列表中显示）
                n.setLatestEventInfo(Main.this, "通知发送人", "我是详细的通知信息我是详细的通知信息我是详细的通知信息", contentIntent);

                // 100 毫秒延迟后，震动 250 毫秒，暂停 100 毫秒后，再震动 500 毫秒
                n.vibrate = new long[] { 100, 250, 100, 500 };

                // 发出通知（其中第一个参数为通知标识符）
                nm.notify(0, n);
            }
        });
    }

    // 将指定的 xml 资源转换为一个 View
    private View inflateView(int resource) {
        LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        return vi.inflate(resource, null);
    }

    // 打开详细通知页后此 Activity 会被 Pause，从详细通知页返回后此 Activity 会被 Resume
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();

        Log.d("MyDebug", "onPause");
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

        Log.d("MyDebug", "onResume");
    }
}

NotificationView.java

代码

package com.webabcd.notification;

import android.app.Activity;
import android.app.NotificationManager;
import android.os.Bundle;
import android.widget.TextView;

// 单击通知列表的某个通知后，所打开的详细的通知页
public class NotificationView extends Activity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.view);

        TextView txtMsg = (TextView)this.findViewById(R.id.txtMsg);
        txtMsg.setText("点通知之后所链接到的 Activity");

        NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        // 取消显示在通知列表中的指定通知（参数为通知标识符）
        nm.cancel(0);

        // 需要关闭此 Activity 的话就 finish 它既可
        // this.finish();
    }
}

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系出名门Android(2) - 布局(Layout)和菜单(Menu)

webabcd — Tue, 19 Jan 2010 01:16:00 GMT

阅读: 1094 评论: 0 作者: webabcd 发表于 2010-01-19 09:16 原文链接

系出名门Android(2) - 布局(Layout)和菜单(Menu)

作者：webabcd

介绍
在 Android 中各种布局的应用，以及菜单效果的实现

各种布局方式的应用，FrameLayout, LinearLayout, TableLayout, AbsoluteLayout, RelativeLayout
为指定元素配置上下文菜单，为应用程序配置选项菜单，以及多级菜单的实现

1、各种布局方式的演示
res/layout/main.xml

代码

xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:gravity="right"
    android:layout_width="fill_parent" android:layout_height="fill_parent">


    <FrameLayout android:layout_height="wrap_content"
        android:layout_width="fill_parent">
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="FrameLayout">
        TextView>
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Frame Layout">
        TextView>
    FrameLayout>

    <TextView android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="@string/hello" />


    <TableLayout android:id="@+id/TableLayout01"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:collapseColumns="1">
        <TableRow android:id="@+id/TableRow01" android:layout_width="fill_parent"
            android:layout_height="wrap_content">
            <TextView android:layout_width="wrap_content"
                android:layout_weight="1" android:layout_height="wrap_content"
                android:text="行1列1" />
            <TextView android:layout_width="wrap_content"
                android:layout_weight="1" android:layout_height="wrap_content"
                android:text="行1列2" />
            <TextView android:layout_width="wrap_content"
                android:layout_weight="1" android:layout_height="wrap_content"
                android:text="行1列3" />
        TableRow>
        <TableRow android:id="@+id/TableRow01" android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <TextView android:layout_width="wrap_content"
                android:layout_height="wrap_content" android:text="行2列1" />
        TableRow>
    TableLayout>


    <AbsoluteLayout android:layout_height="wrap_content"
        android:layout_width="fill_parent">
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="AbsoluteLayout"
            android:layout_x="100px"
            android:layout_y="100px" />
    AbsoluteLayout>


    <RelativeLayout android:id="@+id/RelativeLayout01"
        android:layout_width="fill_parent" android:layout_height="fill_parent">
        <TextView android:layout_width="wrap_content" android:id="@+id/abc"
            android:layout_height="wrap_content" android:text="centerInParent=true"
            android:layout_centerInParent="true" />
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="marginLeft=20px"
            android:layout_marginLeft="20px" />
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="xxx"
            android:layout_below="@id/abc" android:layout_alignRight="@id/abc" />
    RelativeLayout>

LinearLayout>

res/values/strings.xml

xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello Layoutstring>
<string name="app_name">webabcd_layoutstring>
resources>

Main.java

代码

package com.webabcd.layout;

import android.app.Activity;
import android.os.Bundle;

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

2、上下文菜单，选项菜单，子菜单
res/layout/main.xml

代码

res/values/strings.xml

代码

xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello_contextMenu">Hello Context Menustring>
    <string name="hello_subMenu">Hello Context Sub Menustring>
    <string name="app_name">webabcd_menustring>
resources>

Main.java

代码

package com.webabcd.menu;

import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.TextView;
import android.widget.Toast;

// 演示两种菜单的实现方式：上下文菜单（通过在某元素上长按，来呼出菜单）和选项菜单（通过按手机上的菜单按钮，来呼出菜单）
public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 为 R.id.txt1 注册一个上下文菜单（在此 TextView 上长按，则会呼出上下文菜单）
        // 具体呼出的菜单内容需要重写 onCreateContextMenu 来创建
        TextView txt1 = (TextView) this.findViewById(R.id.txt1);
        this.registerForContextMenu(txt1);

        // 为 R.id.txt2 注册一个上下文菜单
        TextView txt2 = (TextView) this.findViewById(R.id.txt2);
        this.registerForContextMenu(txt2);
    }

    // 重写 onCreateContextMenu 用以创建上下文菜单
    // 重写 onContextItemSelected 用以响应上下文菜单
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        // 创建 R.id.txt1 的上下文菜单
        if (v == (TextView) this.findViewById(R.id.txt1)) {

            // ContextMenu.setIcon() - 设置菜单的图标
            // ContextMenu.setHeaderTitle() - 设置菜单的标题
            menu.setHeaderIcon(R.drawable.icon01);
            menu.setHeaderTitle("我是菜单");

            // 用 ContextMenu.add() 来增加菜单项，返回值为 MenuItem
            // 第一个参数：组ID
            // 第二个参数：菜单项ID
            // 第三个参数：顺序号
            // 第四个参数：菜单项上显示的内容
            menu.add(1, 0, 0, "菜单1");

            // MenuItem - 新增菜单项后的返回类型，针对菜单项的其他设置在此对象上操作
            menu.add(1, 1, 1, "菜单2").setCheckable(true);

        }
        // 创建 R.id.txt2 的上下文菜单（多级上下文菜单）
        else if (v == (TextView) this.findViewById(R.id.txt2)) {

            // ContextMenu.addSubMenu("菜单名称") - 用来添加子菜单。子菜单其实就是一个特殊的菜单
            SubMenu sub = menu.addSubMenu("父菜单1");
            sub.setIcon(R.drawable.icon01);
            sub.add(0, 0, 0, "菜单1");
            sub.add(0, 1, 1, "菜单2");
            sub.setGroupCheckable(1, true, true);

            SubMenu sub2 = menu.addSubMenu("父菜单2");
            sub2.setIcon(R.drawable.icon01);
            sub2.add(1, 0, 0, "菜单3");
            sub2.add(1, 1, 1, "菜单4");
            sub2.setGroupCheckable(1, true, false);

        }
    }


    // 重写 onCreateOptionsMenu 用以创建选项菜单
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        MenuItem menuItem = menu.add(0, 0, 0, "菜单111111111111111111111");

        // MenuItem.setIcon() - 设置菜单项的图标
        // MenuItem.setTitleCondensed() - 菜单的简标题，如果指定了简标题的话，菜单项上的标题将会以此简标题为准
        // MenuItem.setAlphabeticShortcut() - 设置选中此菜单项的快捷键
        // 注：菜单项超过 6 个的话，第 6 个菜单将会变为  More 菜单，多余的菜单会在单击 More 菜单之后显示出来
        menuItem.setIcon(R.drawable.icon01);
        menuItem.setTitleCondensed("菜单1");
        menuItem.setAlphabeticShortcut('a');

        menu.add(0, 1, 1, "菜单2").setIcon(R.drawable.icon02);
        menu.add(0, 2, 2, "菜单3").setIcon(R.drawable.icon03);
        menu.add(0, 3, 3, "菜单4");
        menu.add(0, 4, 4, "菜单5");
        menu.add(0, 5, 5, "菜单6");
        menu.add(0, 6, 6, "菜单7").setIcon(R.drawable.icon04);
        menu.add(0, 7, 7, "菜单8").setIcon(R.drawable.icon05);

        return true;
    }

    // 重写 onOptionsItemSelected 用以响应选项菜单
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        super.onOptionsItemSelected(item);

        Toast.makeText(Main.this, "被单击的菜单项为：" + String.valueOf(item.getItemId()), Toast.LENGTH_SHORT).show();

        return false;
    }
}

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