How to stop the rotation of an activity only for a specific fragment in TabLayout?

Question

I have an activity in which I have added a TabLayout. Each tab contains a fragment. I want to block the rotation only in a single fragment, not in all. This is the code that I'm using in a single fragment:

@Override
public void onResume() {
    super.onResume();
    if (activity != null) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
}

@Override
public void onPause() {
    super.onPause();
    if (activity != null) {
        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
}

But it stops the rotation in every fragment. How to solve this? Thanks!

Answer 1

You could try to override setUserVisibleHint(boolean isVisibleToUser) in the Fragment to know when the fragment is actually shown, eg. :

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
 super.setUserVisibleHint(isVisibleToUser);
if(isVisibleToUser && null != activity) { 
 activity.setRequestedOrientation(
  ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
else if(!isVisibleToUser && null != activity) {
 activity.setRequestedOrientation(
  ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
  }
 }

https://developer.android.com/reference/android/app/Fragment.html#setUserVisibleHint

Or put it elsewhere than onResume()/onPause() and where the activity will not be null, eg. onAttach()