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退出多个activity的方法
1.使用List集合方式
用list保存activity实例，然后逐一干掉
import java.util.LinkedList;import java.util.List;import android.app.Activity;import android.app.AlertDialog;import android.app.Application;import android.content.DialogInterface;import android.content.Intent;public class SysApplication extends Application {private List<Activity> mList = new LinkedList<Activity>();private static SysApplication instance;private SysApplication() {}public synchronized static SysApplication getInstance() { if (null == instance) { instance = new SysApplication(); } return instance; }// add Activitypublic void addActivity(Activity activity) { mList.add(activity);} public void exit() { try { for (Activity activity : mList) { if (activity != null) activity.finish(); } } catch (Exception e) { e.printStackTrace(); } finally { // System.exit(0);//去掉这个 }}@Overridepublic void onLowMemory() { super.onLowMemory(); System.gc();}}在每个Activity的onCreate方法中添加类似代码： public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); SysApplication.getInstance().addActivity(this); }在需要退出程序的时候，调用：
SysApplication.getInstance().exit();
简而言之，通过单例模式把每个Activity 的引用添加到一个全局链表中，每次退出程序调用System.exit(0)时，先调用链表中Activity 的finish方法
优点：实现简单，逻辑清晰
2.使用广播
推荐！！好方便！！
基本逻辑就是：定义一个BaseActivity，在这个Activity中绑定广播，在广播的onReceive方法中调用finish();然后以后的Activity都继承这个Activity，退出时发送广播，退出BaseActivity，父activity都退出了，子activity肯定退出。
代码如下：
import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.support.v7.app.AppCompatActivity;public class BaseActivity extends AppCompatActivity { protected BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { finish(); } }; @Override public void onResume() { super.onResume(); // 在当前的activity中注册广播 IntentFilter filter = new IntentFilter(); filter.addAction("ExitApp"); this.registerReceiver(this.broadcastReceiver, filter); } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); //解除绑定 this.unregisterReceiver(this.broadcastReceiver); }}一个Activity实例：
import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.Toast;public class ActivityC extends BaseActivity { Button btn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activity_c); SysApplication.getInstance().addActivity(this); btn = (Button) findViewById(R.id.acticityc_btn); //关闭所有的activity btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { } }); } /** * 捕获手机物理菜单键 */ private long exitTime = 0; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK){//&& event.getAction() == KeyEvent.ACTION_DOWN if((System.currentTimeMillis()-exitTime) > 2000){ Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show(); exitTime = System.currentTimeMillis(); } else { myExit(); } return true; } return super.onKeyDown(keyCode, event); } protected void myExit() { //第二种退出方法 // SysApplication.getInstance().exit(); Intent intent = new Intent(); intent.setAction("ExitApp"); this.sendBroadcast(intent); //super.finish(); } @Override protected void onStop() { super.onStop(); Log.i("tag","ActivityC-onStop"); } @Override protected void onDestroy() { super.onDestroy(); Log.i("tag","ActivityC-onDestroy"); }}就是在退出的地方调用这个：
private long exitTime = 0; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK){//&& event.getAction() == KeyEvent.ACTION_DOWN if((System.currentTimeMillis()-exitTime) > 2000){ Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show(); exitTime = System.currentTimeMillis(); } else { myExit(); } return true; } return super.onKeyDown(keyCode, event); } protected void myExit() { //第二种退出方法 // SysApplication.getInstance().exit(); Intent intent = new Intent(); intent.setAction("ExitApp"); this.sendBroadcast(intent); //super.finish(); }优点：方便，方便！！只需要在退出的地方发送广播就可以！！
这是我的退出时的输出：
08-09 15:33:48.869 26919-26919/example.com.closeapp I/tag: MainActivity-onPause08-09 15:33:49.279 26919-26919/example.com.closeapp I/tag: MainActivity-onStop08-09 15:33:51.569 26919-26959/example.com.closeapp D/OpenGLRenderer: endAllStagingAnimators on 0x55850598b0 (RippleDrawable) with handle 0x558504151008-09 15:33:56.079 26919-26919/example.com.closeapp I/tag: MainActivity-onDestroy08-09 15:33:56.089 26919-26919/example.com.closeapp I/tag: ActivityB-onDestroy08-09 15:33:56.399 26919-26919/example.com.closeapp I/tag: ActivityC-onDestroy
退出多个activity的方法
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