android 关闭所有activity

import java.util.LinkedList;

import java.util.List;

import android.app.Activity;

import android.app.Application;

public class SysApplication extends Application {

private List<Activity> mList = new LinkedList<Activity>();

// 为了实现每次使用该类时不创建新的对象而创建的静态对象

private static SysApplication instance;

// 构造方法

private SysApplication() {

}

// 实例化一次

public synchronized static SysApplication getInstance() {

if (null == instance) {

instance = new SysApplication();

}

return instance;

}

// add Activity

public void addActivity(Activity activity) {

mList.add(activity);

}

// 关闭每一个list内的activity

public void exit() {

try {

for (Activity activity : mList) {

if (activity != null)

activity.finish();

}

} catch (Exception e) {

e.printStackTrace();

} finally {

System.exit(0);

}

}

// 杀进程

public void onLowMemory() {

super.onLowMemory();

System.gc();

}

}