解决android退出整个应用方法

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不解释了，直接说下测试的例子

例子：三个Activity之间任意切换，然后在任意一个界面按下模拟器上的返回键，观察是否退出应用；

先创建一个广播接收器：

package com.study.test;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class MyBroadCast extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stub//Activity被销毁时如果没有解除注册，系统会报异常((Activity)context).unregisterReceiver(this);((Activity)context).finish();}}

工具类：

package com.study.test;import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;public class Util { Activity activity; public Util(Activity activity){ this.activity = activity; } /**  * 注册广播  */public  void  registerBroadcastReceiver() {IntentFilter intentFilter = new IntentFilter();intentFilter.addAction("CLOSE");activity.registerReceiver(new MyBroadCast(), intentFilter);}/** * 关闭Activity */public void exitApp(){Intent intent =new Intent();intent.setAction("CLOSE");activity.sendBroadcast(intent);activity.finish();}}

MainActivity

package com.study.test;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {Button btn1;Button btn2;TextView tv;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                tv = (TextView) findViewById(R.id.tv);        tv.setText("===========MainActivity===========");                btn1 = (Button) findViewById(R.id.btn1);        btn1.setText("to AActivity");        btn1.setOnClickListener(new ButtonClickListener());                btn2 = (Button) findViewById(R.id.btn2);        btn2.setText("to BActivity");        btn2.setOnClickListener(new ButtonClickListener());                    }        public class ButtonClickListener implements View.OnClickListener {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.btn1:startActivity(new Intent(MainActivity.this, AActivity.class));break;case R.id.btn2 :startActivity(new Intent(MainActivity.this, BActivity.class));break;}}        }        @Override    protected void onResume() {    // TODO Auto-generated method stub    super.onResume();    //注册广播    new Util(this).registerBroadcastReceiver();    }    @Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif(keyCode == KeyEvent.KEYCODE_BACK) {System.out.println("---------------->main");  new Util(this).exitApp();}return super.onKeyDown(keyCode, event);}}

AActivity

package com.study.test;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.TextView;public class AActivity extends Activity {Button btn1;Button btn2;TextView tv;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                tv = (TextView) findViewById(R.id.tv);        tv.setText("AActivity------------->");                btn1 = (Button) findViewById(R.id.btn1);        btn1.setText("to MainActivity");        btn1.setOnClickListener(new ButtonClickListener());                btn2 = (Button) findViewById(R.id.btn2);        btn2.setText("to BActivity");        btn2.setOnClickListener(new ButtonClickListener());    }        public class ButtonClickListener implements View.OnClickListener {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.btn1:startActivity(new Intent(AActivity.this, MainActivity.class));break;case R.id.btn2 :startActivity(new Intent(AActivity.this, BActivity.class));break;}}        }        @Override    protected void onResume() {    // TODO Auto-generated method stub    super.onResume();    new Util(this).registerBroadcastReceiver();        }@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif(keyCode == KeyEvent.KEYCODE_BACK) {System.out.println("---------------->a");new Util(this).exitApp();}return super.onKeyDown(keyCode, event);}    }

BActivity

package com.study.test;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.TextView;public class BActivity extends Activity {Button btn1;Button btn2;TextView tv;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                tv = (TextView) findViewById(R.id.tv);        tv.setText("BActivity------------->");                btn1 = (Button) findViewById(R.id.btn1);        btn1.setText("to MainActivity");        btn1.setOnClickListener(new ButtonClickListener());                btn2 = (Button) findViewById(R.id.btn2);        btn2.setText("to AActivity");        btn2.setOnClickListener(new ButtonClickListener());                    }        public class ButtonClickListener implements View.OnClickListener {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.btn1:startActivity(new Intent(BActivity.this, MainActivity.class));break;case R.id.btn2 :startActivity(new Intent(BActivity.this, AActivity.class));break;}}        }    @Override    protected void onResume() {    // TODO Auto-generated method stub    super.onResume();    //注册广播    new Util(this).registerBroadcastReceiver();    }    @Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif(keyCode == KeyEvent.KEYCODE_BACK) {System.out.println("---------------->BActivity界面"); new Util(this).exitApp();}return super.onKeyDown(keyCode, event);}}

布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:id="@+id/tv"         android:textSize="20dp"        android:textColor="@android:color/white"        />    <Button         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:id="@+id/btn1"        />        <Button         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:id="@+id/btn2"        />        <TextView             android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:textSize="18dp"            android:text="测试开始，三个Activity之间任意切换，然后在任何界面按下返回键都会安全的关闭整个应用"            /></LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.study.test"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="8" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:name=".MainActivity"            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=".AActivity"/>        <activity  android:name=".BActivity"/>    </application></manifest>

测试界面：

源码下载链接：

http://download.csdn.net/detail/sdefzhpk/4329553