用户杀死应用程序（android）后会清除什么？

Question

When a user manually kills an app, what data is cleared?

I have a bit of functionality that only properly clears the data on app kill and reopen, so clearly the system is clearing some data that I am missing.

Basically, I want to know what sort of delete/clear data is called programatically so that I can try and figure out what is being kept around on close/reopen that doesn't stick around for kill/reopen.

EDIT: I am basically trying to find out the difference between finish() of an activity that contains a webview and force-close/reopen

Answer 1

When you force close, the app will be completely removed from the memory. For example, all services will be closed, any static variables that you might be holding, everything will be cleared. However, persistent storage such as SharedPreferences will not be affected. Every value that was committed before the force closure of the app will be remain as they were.

Also, you cannot expect the lifecycle methods to be called on Force Close. So if you're doing anything inside onDestroy of a Service or an Activity, that'll most likely fail since the method is never called.