On orientation change, all life cycle functions of the Activity are called, because it is reconstructed from zero. Your application must take this into account. The current activity goes onPause() onStop() onDestroy(), then the new Activity goes onCreate() onStart() onResume(), in that order. Therefore you must store the fact that you have logged in, in … Read more
As far as I can understand, you want to know that what does happen with application data when following actions performed: When exits from Application using device back button When application goes background after tapping Home button When application removed from recent application list 1. When exit from Application using device back button When user … Read more
The fact that you have created a constructor for the Something class public Something(Activity a) { click(); } instead of using onCreate() is probably the source of the error. Something is derived from Activity, in which you have to override onCreate() at the very least, and set the View of your Activity in it. You … Read more