I have some trouble with understanding of singleTop concept with launching Activities.
we have some activities A,B,C,D and singleTop is defined with activity B in manifest file.
As i read if we will go A->B->C->D->D than instance of D activity will not create and D will be top on the stack.
But if we will go A->B->C->D->B than what will happen? Which activity will be launch and which will be top on stack?
Please suggest.
The launch mode singleTop applies only for Activities that are on top of the stack.
Let the stack be A-B-C-D (D on top) and D is an activity with singleTop launch mode. If you add another instance to this stack then D will not be instantiated again and the existing instance of D will receive a callback to onNewIntent().
Stack: A-B-C-D
But if the stack was like A-B-C-D-B (B on top) and then you launch an activity of D, then it will simply create a new instance of D and put at the top of the stack. This is because D was not at the top of the stack.
Stack: A-B-C-D-B-D