彻底退出android程序的方法

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<Activity> 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：http://www.yoyong.com/archives/199