In Fragment on back button pressed Activity is blank

Question

I have an Activity and many fragments inflated in same FrameLayout

Answer 1

If you have more than one fragment been used in the activity or even if you have only one fragment then the first fragment should not have addToBackStack defined. Since this allows back navigation and prior to this fragment the empty activity layout will be displayed.

 // fragmentTransaction.addToBackStack() // dont include this for your first fragment.

But for the other fragment you need to have this defined otherwise the back will not navigate to earlier screen (fragment) instead the application might shutdown.

Answer 2

Sorry for the late response.

You don't have to add ft.addToBackStack(null); while adding first fragment.

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, profileFragment);
// ft.addToBackStack(null); --remove this line.
ft.commit();
// ... rest of code

Answer 3

Just don't add the first fragment to back stack

Here is the Kotlin code that worked for me.

    val ft = supportFragmentManager.beginTransaction().replace(container, frag)
    if (!supportFragmentManager.fragments.isEmpty()) ft.addToBackStack(null)
    ft.commit()

Answer 4

I still could not fix the issue through getBackStackEntryCount() and I solved my issue by making the main page a fragment too, so in the end I have an activity with a FrameLayout only; and all other fragments including the main page I inflate into that layout. This solved my issue.

Answer 5

I had the same problem when dealing with Firebase's Ui Login screen. When back button was pressed it left a blank screen.

To solve the problem I just called finish() in my onStop() method for said Activity. Worked like a charm.