package com.cqupt.util;import java.util.LinkedList;import java.util.List;import android.app.Activity;import android.app.Application;public class ExitApplication extends Application {	private List
    
      activityList = new LinkedList();	private static ExitApplication instance;	private ExitApplication()	{	}	//单例模式中获取唯一的ExitApplication实例	public static ExitApplication getInstance()	{	if(null == instance)	{	instance = new ExitApplication();	}	return instance; 	}	//添加Activity到容器中	public void addActivity(Activity activity)	{		activityList.add(activity);	}	//遍历所有Activity并finish	public void exit()	{		for(Activity activity : activityList)		{			activity.finish();		}		System.exit(0);	}	}
    

在每个Activity的OnCreate方法里面写上

ExitApplication.getInstance().addActivity(this);

在要结束程序的地方：

if (!isExit) {					Toast.makeText(MoreActivity.this, "再点一次退出程序", Toast.LENGTH_SHORT).show();					isExit = true;				}else{					ExitApplication.getInstance().exit();				}

转载自：