朝花夕拾-android 自定义application 管理activity的生命周期

为了安全退出多个已创建的activity?

可以自定义application:myapplication.

增加一个list成员保存,一些关键的已创建的activity实例:

 1 private List<Activity> activityList = new LinkedList<Activity>();

 2 

 3 // 保存 所有activity的this

 4     public void addActivity(Activity activity) {

 5         activityList.add(activity);

 6     }

 7 

 8 public void exit() {

 9         // save cache data to db

10         CacheManager cacheManager = CacheManager.getInstance(this);

11         cacheManager.saveNewCache1ToDB();

12         this.msgNewListMap.clear();

13         for (Activity activity : activityList) {

14             activity.finish();

15         }

16     }

然后在activit创建的时候,oncreate中添加该activity到list中

1 MyApplication.getInstance().addActivity(ChatListActivity.this);

在程序退出时,例如双击返回键退出程序,调用application的exit方法:

 1 // 退出

 2     @Override

 3     public boolean onKeyDown(int keyCode, KeyEvent event) {

 4         // TODO Auto-generated method stub

 5         if (keyCode == KeyEvent.KEYCODE_BACK) {

 6             long currentTime = System.currentTimeMillis();

 7             if ((currentTime - touchTime) >= waitTime) {

 8                 showCustomToast(R.string.main_exit);

 9                 touchTime = currentTime;

10             } else {

11                 // android.os.Process.killProcess(android.os.Process.myPid());

12                 MyApplication.getInstance().exit();

13             }

14             return true;

15 

16         }

17         return super.onKeyDown(keyCode, event);

18     }

代码完整路径:http://git.oschina.net/zj2012zy/Android-Demo/tree/master/CustomApplication

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