关闭所有activity

<span style="font-size:18px;">package com.layout;

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
*
*/
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();
}
}
在每个activity被创建时加上
<span><span>SysApplication.getInstance().addActivity(</span><span class="keyword">this</span><span>);
</span></span>
当你想关闭时，调用SysApplication的<span style="color:#0000ff;">exit方</span>法<span><span class="comment">
//关闭整个程序</span><span>  </span></span><span>
SysApplication.getInstance().exit(); 
</span>

</span>