Fragment's onResume() not called when popped from backstack

Question

Hi I am developing android application in which I am using I am using single Activity and 3 fragments. So consider I have 3 fragments A B C. When I switch from A to B, I am adding Fragment to backstack and simillar for B to C. Now when I click back from C it shows me B and similar for B to A as well.

But thing is that when I come from C to B or B to A, it's not calling onResume() or any other life cycle methods of Fragment.

What I want to do actually for every Fragment I have different title in ActionBar. So, in my code, when I move from A to B or B to c, I am changing activity title inside fragment. But when I click on back it not changing according to that.

What is the actual problem? Why after pop from backstack its not calling onResume() for my Fragment? How do I solve this problem? Need Help. Thank you.

Answer 1

onResume() of the Fragment is called only when the Activity is resumed. So this wont help you. Even I'm facing similar issue right now. You can implement OnBackStackChangedListener and get the fragment name in the top of the stack and set the ActionBar title based on that.

private FragmentManager.OnBackStackChangedListener getListener() {     FragmentManager.OnBackStackChangedListener result = new FragmentManager.OnBackStackChangedListener()     {         public void onBackStackChanged()         {             FragmentManager manager = getFragmentManager();              if (manager != null)             {                 if(manager.getBackStackEntryCount() >= 1){                     String topOnStack = manager.getBackStackEntryAt(manager.getBackStackEntryCount()-1).getName();                     Log.i("TOP ON BACK STACK",topOnStack);                 }                 }             }     };      return result; }