Android学习笔记--AlertDialog应用

1. 自定义实现带图标的TextView

IconTextView.java

package com.evor.andtest;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.TextView;

public class IconTextView extends TextView {
    // 命名空间的值
    private final String namespace = "http://net.blogjava.mobile";
    // 保存图像资源ID的变量
    private int resourceId = 0;
    private Bitmap bitmap;

    public IconTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // getAttributeResourceValue方法用来获得组件属性的值，在本例中需要通过该方法的第1个参数指
        // 定命名空间的值。该方法的第2个参数表示组件属性名（不包括命名空间名称），第3个参数表示默
        // 认值，也就是如果该属性不存在，则返回第3个参数指定的值
        resourceId = attrs.getAttributeResourceValue(namespace, "iconSrc", 0);
        if (resourceId > 0)
            // 如果成功获得图像资源的ID，装载这个图像资源，并创建Bitmap对象
            bitmap = BitmapFactory.decodeResource(getResources(), resourceId);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (bitmap != null) {
            // 从原图上截取图像的区域，在本例中为整个图像
            Rect src = new Rect();
            // 将截取的图像复制到bitmap上的目标区域，在本例中与复制区域相同
            Rect target = new Rect();
            src.left = 0;
            src.top = 0;
            src.right = bitmap.getWidth();
            src.bottom = bitmap.getHeight();
            int textHeight = (int) getTextSize();
            target.left = 0;
            // 计算图像复制到目标区域的纵坐标。由于TextView组件的文本内容并不是
            // 从最顶端开始绘制的，因此，需要重新计算绘制图像的纵坐标
            target.top = (int) ((getMeasuredHeight() - getTextSize()) / 2) + 1;
            target.bottom = target.top + textHeight;
            // 为了保证图像不变形，需要根据图像高度重新计算图像的宽度
            target.right = (int) (textHeight * (bitmap.getWidth() / (float) bitmap
                    .getHeight()));
            // 开始绘制图像
            canvas.drawBitmap(bitmap, src, target, getPaint());
            // 将TextView中的文本向右移动一定的距离（在本例中移动了图像宽度加2个象素点的位置）
            canvas.translate(target.right + 2, 0);
        }
        super.onDraw(canvas);
    }
}

MainActivity.java  （另外还实现了获取系统当前时间的功能）

package com.evor.andtest;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.AlertDialog;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends ActionBarActivity implements OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Button btnShowDate = (Button)findViewById(R.id.btnShowDate);
        Button btnShowTime = (Button)findViewById(R.id.btnShowTime);        
        btnShowDate.setOnClickListener(this);
        btnShowTime.setOnClickListener(this);        
    }
    
    private void showDialog(String title,String msg){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(title);
        builder.setMessage(msg);
        builder.setPositiveButton("确定", null);
        builder.create().show();
    }    
    
    public void onClick(View v){
        switch(v.getId()){
        case R.id.btnShowDate:{
            SimpleDateFormat sdf = new  SimpleDateFormat("yyyy-MM-dd");
            showDialog("当前日期",sdf.format(new Date()));
            break;            
        }
        case R.id.btnShowTime:{
            SimpleDateFormat sdf = new  SimpleDateFormat("HH:mm:ss");
            showDialog("当前时间",sdf.format(new Date()));
            break;            
        }
        
        }
    }
    
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:mobile="http://net.blogjava.mobile"
    xmlns:tools="http://schemas.android.com/tools"    
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.evor.andtest.MainActivity" >

    <Button
        android:id="@+id/btnShowDate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示当前日期"
        />
    
    <Button
        android:id="@+id/btnShowTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="显示当前时间"
        />
    
    <com.evor.andtest.IconTextView
        android:id ="@+id/txtFace1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="测试TextView"
        mobile:iconSrc="@drawable/ic_launcher"
        />
    
    <com.evor.andtest.IconTextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="测试TextView"
        android:textSize="24dp"
        mobile:iconSrc="@drawable/ic_launcher"
        />
    
 
</LinearLayout>

实现效果：

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2.含有3个按钮的AlertDialog

MainActivity.java

package com.evor.test;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.example.andtest002alertdialog.R;

public class MainActivity extends ActionBarActivity implements OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn = (Button)findViewById(R.id.btn1);
        btn.setOnClickListener(this);        
    }
    
    @Override
    public void onClick(View v) {
        Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("是否覆盖文件");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //单击确定按钮后，显示一个无按钮的对话框-
                new AlertDialog.Builder(MainActivity.this).setMessage("文件已被覆盖").create().show();
            }
        });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                // 单击取消按钮后，显示一个无按钮的对话框
                new AlertDialog.Builder(MainActivity.this).setMessage("取消了操作").create().show();
                
            }
        });
        builder.setNeutralButton("忽略", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //单击取消按钮后，显示一个无按钮的对话框
                new AlertDialog.Builder(MainActivity.this).setMessage("忽略覆盖操作").create().show();
                
            }
        }).show();
        
//        //以上代码这样写也可以
//        new AlertDialog.Builder(this)
//            .setTitle("是否覆盖文件")
//            .setPositiveButton("确定", new DialogInterface.OnClickListener() {
//                @Override
//                public void onClick(DialogInterface dialog, int which) {
//                    //单击确定按钮后，显示一个无按钮的对话框-
//                    new AlertDialog.Builder(MainActivity.this).setMessage("文件已被覆盖").create().show();
//                }
//            })
//            .setNegativeButton("取消", new DialogInterface.OnClickListener() {
//                @Override
//                public void onClick(DialogInterface dialog, int which) {
//                    // 单击取消按钮后，显示一个无按钮的对话框
//                    new AlertDialog.Builder(MainActivity.this).setMessage("取消了操作").create().show();
//                    
//                }
//            })
//            .setNeutralButton("忽略", new DialogInterface.OnClickListener() {
//                @Override
//                public void onClick(DialogInterface dialog, int which) {
//                    //单击取消按钮后，显示一个无按钮的对话框
//                    new AlertDialog.Builder(MainActivity.this).setMessage("忽略覆盖操作").create().show();
//                    
//                }
//            }).show();
        
    }
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.evor.test.MainActivity" >

    <Button
        android:id="@+id/btn1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="确认/取消对话框"
        />

</LinearLayout>

 实现效果：

 

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3.用AlertDialog实现单选框、多选框

MainActivity.java

package com.evor.test;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;

public class MainActivity extends ActionBarActivity implements OnClickListener{

    //列表对话框的字符串数组数据源
    private String[] provinces = new String[]{
            "辽宁省","山东省","河北省","福建省","广东省","黑龙江省"
    };
    //单击事件类的对象实例
    private ButtonOnClick buttonOnClick = new ButtonOnClick(1);
    
    //用于保存多选列表对话框中的ListView对象
    private ListView listView = null;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn1 = (Button)findViewById(R.id.btn1);
        Button btn2 = (Button)findViewById(R.id.btn2);
        Button btn3 = (Button)findViewById(R.id.btn3);
        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);        
    }

    
    //显示简单列表对话框
    private void showListDialog(){
        new AlertDialog.Builder(this).setTitle("选择省份")
            .setItems(provinces,new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    final AlertDialog ad = new AlertDialog.Builder(MainActivity.this)
                        .setMessage("您已经选择了:"+which+":"+provinces[which]).show(); 
                    Handler handler = new Handler();
                    //设置定时器，5S后调用run方法,使对话框自动消失
                    handler.postDelayed(new Runnable(){
                        @Override
                        public void run() {
                            ad.dismiss();                            
                        }                        
                    }, 5000);
                }
            }).show();
    }
    
    //显示单选列表对话框
    private void showSingleChoiceDialog(){
        new AlertDialog.Builder(this).setTitle("选择省份")
            .setSingleChoiceItems(provinces, 1, buttonOnClick)
            .setPositiveButton("确定",buttonOnClick)
            .setNegativeButton("取消", buttonOnClick).show();
    }
    
    //显示多选列表对话框(演示了另一种创建对话框的方法)
    private void showMultiChoseDialog(){
        Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("选择省份");
        //设置选项
        builder.setMultiChoiceItems(provinces, new boolean[]{false,false,false,false,false,false},
                new DialogInterface.OnMultiChoiceClickListener() {                                
            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
            }
        });
        //设置确定按钮
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {                        
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //int count = listView.getCount();
                String s = "您选择了：";
                for(int i = 0 ;i < provinces.length ; i++){
                    if(listView.getCheckedItemPositions().get(i)==true)
                        s= s + i+":"+listView.getAdapter().getItem(i);
                }
                if(listView.getCheckedItemPositions().size()>0){
                    new AlertDialog.Builder(MainActivity.this).setMessage(s).show();
                }else{
                    new AlertDialog.Builder(MainActivity.this).setMessage("未选择任何省份").show();
                }
            }
        });
        //设置取消按钮
        builder.setNegativeButton("取消", null);
        //创建对话框
        AlertDialog ad = builder.create();                    
        listView = ad.getListView();
        ad.show();
    }
    
    
    
    //确定对话框内选择的是什么
    private class ButtonOnClick implements DialogInterface.OnClickListener{
        private int index; //表示省份数组的索引
        public ButtonOnClick(int index){
            this.index = index;        
        }        
        @Override
        public void onClick(DialogInterface dialog, int which) {
            //which表示单击的按钮索引，所有列表项的索引都是大于等于0的，按钮的索引是小于0的
            if(which >=0){
                index = which; //如果单击的是列表项，保存列表项索引到index
                //如果想单击之后关闭对话框，可调用dialog.cancel()或者dialog.dismiss()
            }else{
                if(which == DialogInterface.BUTTON_POSITIVE){ //单击确定按钮
                    new AlertDialog.Builder(MainActivity.this)
                        .setMessage("选择了"+index+":"+provinces[index]).show();
                }
            }            
        }        
    }//END CLASS
    
    //响应按钮动作
    @Override
    public void onClick(View v) {
        switch(v.getId()){
        case R.id.btn1:{
            showListDialog();
            break;
        }
        case R.id.btn2:{
            showSingleChoiceDialog();
            break;
        }
        case R.id.btn3:{
            showMultiChoseDialog();
            break;
        }        
        }        
    }

}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.evor.test.MainActivity" >

    
    <Button
        android:id="@+id/btn1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="显示列表对话框"
        />
    
    <Button
        android:id="@+id/btn2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="显示单选列表对话框"
        />
    <Button
        android:id="@+id/btn3"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="显示多选列表对话框"
        />

</LinearLayout>

 

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4.用AlertDialog实现含编辑框的对话框

MainActivity.java

package com.evor.test;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TableLayout;

public class MainActivity extends ActionBarActivity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        final Builder builder = new AlertDialog.Builder(this);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn1 = (Button)findViewById(R.id.btn1);        
        
        btn1.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                builder.setTitle("含编辑框的对话框");
                TableLayout loginForm = (TableLayout)getLayoutInflater().inflate(R.layout.login, null);
                builder.setView(loginForm); //设置对话框显示的view对象
                builder.setPositiveButton("登录",
                        new DialogInterface.OnClickListener(){ //注意，要加前面的DialogInterface，否则会混淆
                            @Override
                            public void onClick(DialogInterface dialog,int which) {
                                //执行登录处理                                
                            }                    
                        });
                builder.setNegativeButton("取消", 
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // 取消登录                                
                            }
                        });
                builder.create().show();
            };
        });
    }//END onCreate
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.evor.test.MainActivity" >
    
    <Button
        android:id="@+id/btn1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="输入信息"
        />
    
  

</LinearLayout>

login.xml

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/loginForm"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TableRow>
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="用户名"
            android:textSize="10pt"            
            />
        <EditText
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="请填写登录账号"
            android:selectAllOnFocus="true"            
            />
    </TableRow>
    
    <TableRow>
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="密码"            
            android:textSize="10pt"            
            />
        <EditText
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:password="true"
            />
    </TableRow>
    
    <TableRow>
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="电话"            
            android:textSize="10pt"            
            />
        <EditText
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="请输入电话号码"
            />       
    </TableRow>
    
    <Button
        
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="注册"
        />    
</TableLayout>

实现效果：

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5.AlertDialog作为Activity的主题

MainActivity.java

package com.evor.test;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import android.app.Activity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnDismissListener;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

    private DateDialog dateDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnCurrentDate = (Button) findViewById(R.id.btn1);
        Button btnFinish = (Button) findViewById(R.id.btn2);
        MyOnClickListener mylistener = new MyOnClickListener();
        btnCurrentDate.setOnClickListener(mylistener);
        btnFinish.setOnClickListener(mylistener);
        dateDialog = new DateDialog(this);

    }// END onCreate

    class MyOnClickListener implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            switch(v.getId()){
            case R.id.btn1:{
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd",Locale.getDefault());
                dateDialog.setTitle("当前日期："+sdf.format(new Date()));
                dateDialog.setButton("确定", new OnClickListener(){
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                                            
                    }                
                });
                dateDialog.setOnDismissListener(new OnDismissListener(){
                    @Override
                    public void onDismiss(DialogInterface dialog) {
                        new DateDialog.Builder(MainActivity.this).create().show();                    
                    }                
                });
                dateDialog.show();
                break;
            }
            case R.id.btn2:
                finish();
                break;        
            }
        }//END onClick
    }//END inner class
    
    @Override
    public boolean onTouchEvent(MotionEvent event){
        finish();
        return true;
    }
}

DateDialog.java

package com.evor.test;

import android.app.AlertDialog;
import android.content.Context;
import android.view.MotionEvent;

public class DateDialog extends AlertDialog{
    public DateDialog(Context context){
        super(context);
    }
    
    //触摸屏幕任何地方都会出发该事件
    @Override
    public boolean onTouchEvent(MotionEvent event){
        dismiss();     //关闭对话框
        return super.onTouchEvent(event);
    }
    
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="horizontal"
    tools:context="com.evor.test.MainActivity" >
    
    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="当前日期"
        />
    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="关闭"
        />

</LinearLayout>

AndroidManifest.xml中需要修改的地方

<activity
　　android:name="com.evor.test.MainActivity"
　　android:label="@string/app_name" 
　　android:theme="@android:style/Theme.Dialog"> <!-- 设置主题为对话框形式 -->
　　。。。。。省略
</activity>

上面加了一行 android:theme="@android:style/Theme.Dialog"

实现效果：

 

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