学步园

1、继承一个Application写一个exitapplication类：

public class exitapplication extends Application {

private List<Activity> activityList = new LinkedList<Activity>();
private static exitapplication instance;

            private exitapplication()
            {
            }
             //单例模式中获取唯一的MyApplication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);
            }
}

2、在每个Activity中把该activity添加进类exitapplication，this代表该Activity

exitapplication.getInstance().addActivity(this);// 添加Activity到容器中，以便应用完全退出

3、在退出应用时调用exitapplicaition

exitapplication.getInstance().exit();