CODEWITHSUNDEEP
androidandroid-activitylaunchmode
Gaurav Sharma
Gaurav Sharma

Reputation: 13

Launch singleTop between multiple activites

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.

Upvotes: 1

Views: 2196

Answers (1)

Harikumar Alangode
Harikumar Alangode

Reputation: 561

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

Upvotes: 1

Related Questions