If Android kills the process hosting your app, it still maintains the "saved instance state" of all active (non-finished) activities. This data is stored by the ActivityManager
. If the user returns to your application, Android will create a new process for the app, instantiate the Application
instance again and then create an instance of the top activity in the activity stack. It will then call onCreate()
on that activity instance passing it the "saved instance state" that was most recently saved for that activity.
If you reboot your phone, all this data is lost (Android does not save application state across reboots).
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…