Android第十一周、十二周作业

<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="内部存储:"
        android:textSize="38sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/et_out"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:gravity="center"
            android:hint="请输入要保存的内容" />

        <Button
            android:id="@+id/btn_output"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="click_output"
            android:text="写入" />
    </LinearLayout>        
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/et_in"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="3"
            android:gravity="center"
            android:hint="输出已保存的内容" />

        <Button
            android:id="@+id/btn_input"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="click_input"
            android:text="读取" />

    </LinearLayout>       
</LinearLayout>

package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private EditText et_out, et_in;

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

        initView();     //findViewByiId 初始化
    }


    private void initView() {   //findViewByiId 初始化
        et_out = findViewById(R.id.et_out);
        et_in = findViewById(R.id.et_in);
    }       //findViewByiId 初始化

    public void click_output(View view) {       //写入输入框内的字符串
        String fileName = "data.txt";       //创建储存文件
        String content = et_out.getText().toString();   //获取储存字符串
        FileOutputStream fos = null;        //创建创建 FilOutputStream 对象 使用其 write() 方法储存数据
        try {
            fos = openFileOutput(fileName, MODE_PRIVATE);   //打开 并获取 输出流对象 （文件名， 操作模式）
            fos.write(content.getBytes());      //wirte()方法  将数据写入文件
        } catch (Exception e) {
            e.printStackTrace();        //抛出异常
        } finally {
            try {
                if (fos != null) {
                    fos.close();        //关闭输出流
                }
            } catch (IOException e) {
                e.printStackTrace();        //抛出异常
            }
        }
        Toast.makeText(MainActivity.this, content + "写入成功！", Toast.LENGTH_SHORT).show();
    }       //写入输入框内的字符串

    public void click_input(View view) {
        String content = "";       //创建 空字符串变量 获取 已保存的 字符串
        FileInputStream fis = null;     //创建 FileInputStream 对象
        try {
            fis = openFileInput("data.txt");        //获得文件输入流对象
            byte[] buffer = new byte[fis.available()];      //创建缓冲区，并获取文件长度
            fis.read(buffer);                   //将文件内容读取到 buffer 缓冲区
            content = new String(buffer);       //转换成字符串
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (fis != null) {
                    fis.close();            //关闭输入流
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        et_in.setText(content);
        Toast.makeText(MainActivity.this, content + "读取成功！", Toast.LENGTH_SHORT).show();
    }       //输出字符串至 输出框
}

　　

import java.io.File;
import java.util.Map;
import android.os.Bundle;
import android.app.Activity;
import android.content.DialogInterface.OnClickListener;
import android.content.SharedPreferences.Editor;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Toast;
 
import androidx.annotation.CheckResult;
import androidx.appcompat.app.AppCompatActivity;
 
public class MainActivity extends AppCompatActivity implements android.view.View.OnClickListener{
 
    private EditText et_account;
    private EditText et_password;
    private Button btn_login;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        Map<String, String> userInfo=FileSaveQQ.getUserInfo(this);
        if(userInfo!=null){
            et_account.setText(userInfo.get("account"));
            et_password.setText(userInfo.get("password"));
        }
    }
    private void initView() {
        // TODO Auto-generated method stub
        et_account=(EditText)findViewById(R.id.et_account);
        et_password=(EditText)findViewById(R.id.et_password);
        btn_login=(Button)findViewById(R.id.btn_login);
        btn_login.setOnClickListener(this);
        CheckBox cb1=findViewById(R.id.cb_1);
        cb1.setOnClickListener(this);
        CheckBox cb2=findViewById(R.id.cb_2);
        cb2.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(v.getId()){
            case R.id.btn_login:
                String account=et_account.getText().toString().trim();
                String password=et_password.getText().toString();
                if(TextUtils.isEmpty(account)){
                    Toast.makeText(this, "请输入账号", Toast.LENGTH_SHORT).show();
                    return;
                }
                if(TextUtils.isEmpty(password)){
                    Toast.makeText(this, "请输入密码", Toast.LENGTH_SHORT).show();
                    return;
                }
                Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();
 
        }
 
    }
 
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
        switch (compoundButton.getId()){
            case R.id.cb_1 :
                String account=et_account.getText().toString().trim();
                String password=et_password.getText().toString();
                boolean isSaveSuccess=FileSaveQQ.saveUserInfo(this, account, password);
                if(isSaveSuccess&&b){
                    Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show();
                }else{
                    Toast.makeText(this, "保存失败", Toast.LENGTH_SHORT).show();
                    et_account.setText(null);
                    et_password.setText(null);
                }
 
                break;
            case R.id.cb_2: account=et_account.getText().toString().trim();
                password=et_password.getText().toString();
                if(TextUtils.isEmpty(account)){
                    Toast.makeText(this, "请输入账号", Toast.LENGTH_SHORT).show();
                    return;
                }
                if(TextUtils.isEmpty(password)){
                    Toast.makeText(this, "请输入密码", Toast.LENGTH_SHORT).show();
                    return;
                }
                if(b)
                    Toast.makeText(this, "登录成功", Toast.LENGTH_SHORT).show();
                else{
                    Toast.makeText(this, "请登录", Toast.LENGTH_SHORT).show();
                }
 
        }
    }
}

　　

import android.content.Context;
import android.content.SharedPreferences;
 
import java.util.HashMap;
import java.util.Map;
 
 class FileSaveQQ{
    private static String password;
 
    public static boolean saveUserInfo(Context context, String account, String password) {
        FileSaveQQ.password = password;
        SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);
        SharedPreferences.Editor edit=sp.edit();
        edit.putString("userName", account);
        edit.putString("pwd",password);
        edit.commit();
        return true;
    }
    public  static Map<String,String > getUserInfo(Context context){
        SharedPreferences sp=context.getSharedPreferences("data", Context.MODE_PRIVATE);
        String account=sp.getString("useName",null);
        String password=sp.getString("pwd",null);
        Map<String,String > userMap=new HashMap<String, String>();
        userMap.put("account",account);
        userMap.put("password",password);
        return userMap;
 
    }
}

　　

<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:orientation="vertical">
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:orientation="horizontal"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="账号"
            android:textColor="#000"
            android:textSize="20sp"
            />
        <EditText
            android:id="@+id/et_account"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:hint="请输入用户名"
            android:background="@null"
            android:padding="10dp"
            />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:orientation="horizontal"
        >
        <TextView
            android:id="@+id/tv_password"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="密码"
            android:textColor="#000"
            android:textSize="20sp"
            />
        <EditText
            android:id="@+id/et_password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:background="@null"
            android:hint="请输入密码"
            android:inputType="textPassword"
            android:padding="10dp"
            />
    </LinearLayout>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:orientation="horizontal"
        >
 
        <CheckBox
            android:id="@+id/cb_1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:layout_marginStart="3dp"
            android:layout_marginTop="19dp"
            android:text="记住密码"
            android:textSize="20sp"
            />
 
        <CheckBox
            android:id="@+id/cb_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:layout_marginStart="140dp"
            android:layout_marginTop="19dp"
            android:text="自动登录"
            android:textSize="20sp"
            />
 
        <Button
            android:id="@+id/btn_login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="280dp"
            android:layout_marginTop="15dp"
            android:background="#2481BE"
            android:text="登录"
            android:textColor="@android:color/white"
            android:textSize="20sp" />
 
    </RelativeLayout>
 
 
</LinearLayout>