package com.lgaoxiao.application;

import java.util.LinkedList;

import java.util.List;

import android.app.Activity;

import android.app.Application;

/**

 * 一个类 用来结束所有后台 activity

 *

 * @author Administrator

 * @see http://java--hhf.iteye.com/blog/1826880

 *

 */

public class SysApplication extends Application {

    // 运用list来保存们每一个activity是关键

    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();

    }

}