Android :应用程序由于内存限制而出栈时的状态

Question

请帮我解决这个问题。

1 > I am having application which Uses Service to retrieve data from server.
2 > Now on Pressing Home key and i have opened new application..
3 > I have opened around 20 application.
4 > So my application might go out of memory stack.
5 > now i am resuming my application, application crashes as i am opening activity of my
    application which is not in the stack.

有没有什么办法可以处理这个异常，并将我的活动重定向到主页或重新启动应用程序简历，而不是堆栈中……

Answer 1

确实是一个非常好的问题，我试着自己找出答案。

我甚至想知道杀死一个应用程序和重启手机有什么区别。

如果用户手动关闭一个应用程序或打开其他20个应用程序，他可能希望应用程序从头开始。为什么Android在手机重启后不能恢复状态？

此外，我还看到，当应用程序被(系统)终止时，全局变量在活动重新启动时变为null。这在某种程度上打破了Java的概念。如果你在应用程序中有某种状态，而应用程序删除了它，我希望应用程序重新启动。

我提出的解决方案是：

1. Handle the case of a state problem: Initiate a simple state (new Object()) as a global variable. For each Activity, in the methods onCreate/Start/Resume check that the state is null. If it's null launch the first activity with 'Intent.FLAG_ACTIVITY_CLEAR_TOP' - as if the application is relaunched.
 2. Try not to use global variables - Always put data in the intent.
 3. Lazy load global variables - If you do want to use global data, don't count on one time initialization. Lazy load them 'if (A.MY_DATA == null) {A.MY_DATA = new ...}' - Don't forget to do it in the background if it will take a long time (AsyncTask). Loading partial state needs to be done carefully because it may not comply to other loaded state objects.

第一点的缺点是，状态问题处理需要在每个活动上完成(AOP还没有在Android中实现)。

希望这能帮上忙。

Answer 2

使用SharedPreferences保存应用程序状态