Android 关闭多个Activity

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);             }}@Overridepublic void onLowMemory() {    super.onLowMemory();      System.gc();}}在每个Activity的onCreate方法中添加类似代码：[java] public void onCreate(Bundle savedInstanceState) {             super.onCreate(savedInstanceState);                SysApplication.getInstance().addActivity(this);            }       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();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方法附：此方法也可参考链接：http://maosidiaoxian.iteye.com/blog/1404725复制代码 方法二、使用广播复制代码//2.2退出整个应用难免让人困扰，曾经一度的尝试一下方式：ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);     manager.killBackgroundProcesses(package);//不行android.os.Process.killProcess(android.os.Process.myPid());  // 也不行manager.restartPackage(package); // 还是不行Intent MyIntent = new Intent(Intent.ACTION_MAIN);   MyIntent.addCategory(Intent.CATEGORY_HOME);   startActivity(MyIntent);   finish();//这个只是退回到桌面，如果打开多个Activity关闭重新打开也会有问题，还是还是不行//看到有人说广播机制，发现是个好东东，能彻底解决这个问题，废话不说看代码：public abstract class EnterActivity extends BaseActivity {   ...// 写一个广播的内部类，当收到动作时，结束activity  private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {    @Override       public void onReceive(Context context, Intent intent) {            unregisterReceiver(this); // 这句话必须要写要不会报错，不写虽然能关闭，会报一堆错            ((Activity) context).finish();          }       };   @Override   public void onResume() {      super.onResume();// 在当前的activity中注册广播IntentFilter filter = new IntentFilter();     filter.addAction(Attribute.PAGENAME);     registerReceiver(this.broadcastReceiver, filter); // 注册}public void close() {    Intent intent = new Intent();       intent.setAction(Attribute.PAGENAME); // 说明动作         sendBroadcast(intent);// 该函数用于发送广播       finish();       }      ... }别人写的缺了个地方(unregisterReceiver)这个必须要加，不然会出一堆错，找了个最简单的方法。

感谢原作者   http://www.cnblogs.com/yejiurui/archive/2012/12/30/2839463.html