Can't set FLAG_ACTIVITY_SINGLE_TOP and FLAG_ACTIVITY_CLEAR_TOP in the same intent?

Question

I use the FLAG_ACTIVITY_SINGLE_TOP and FLAG_ACTIVITY_CLEAR_TOP flag to return to the previous "standard" activity. I use FLAG_ACTIVITY_SINGLE_TOP to prevent the re-creation of a new instance. But I found that the FLAG_ACTIVITY_SINGLE_TOP flag FLAG_ACTIVITY_SINGLE_TOP ignored, and the action completes and is recreated.

• Here is what I found in the docs. FLAG_ACTIVITY_CLEAR_TOP : it says that you can add FLAG_ACTIVITY_SINGLE_TOP when using FLAG_ACTIVITY_CLEAR_TOP to prevent "completion - re-creation".

• Here is another document. FLAG_ACTIVITY_CLEAR_TOP :

  Note. If the launch mode of the specified action is "standard", it is also removed from the stack, and a new instance is launched instead to process the incoming intent. This is because a new instance is always created for a new intention when the startup mode is "standard".

Did I misunderstand the first document?

Answer 1

The documentation states that FLAG_ACTIVITY_CLEAR_TOP is all you need to set. But you really have to set both to prevent the re-creation of activity.

This did the trick in my case: (The main one was the activity I wanted to return to)

  Intent tabIntent = new Intent(this, Main.class); tabIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(tabIntent); 

Answer 2

This may be useful: Android Intent.FLAG_ACTIVITY_SINGLE_TOP AND Intent.FLAG_ACTIVITY_CLEAR_TOP

Answer 3

Check this. Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED | Intent.FLAG_ACTIVITY_SINGLE_TOP)