Set landscape orientation for fragment in Single Activity Architecture

Question

How to achieve to lock screen orientation for only one Fragment in Single Activity Architecture (only one Activity for whole app)?

Is there better solution than specify requested orientation in each Fragment? I'm trying to avoid putting activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED to each unrelated Fragment

Answer 1

Let me start by saying that @madlymad has the right idea, and you should create a BaseFragment class if you haven't already.

However if for some reason you can't or don't want to, you can instead set the orientation in the Fragment's onAttached(), onCreate() or onCreateView()

activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT

and then reset in their respective counterparts onDetached(), onDestroy() or onDestroyView()

activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED

This will ensure that you only get different orientation in the correct fragment.

Answer 2

Add below line where you want to fragment in Landscape Mode:

     @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            // Inflate the layout for this fragment 
            //ADD BELOW LINE
            getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

            view = inflater.inflate(R.layout.fragment_dashboard, container, false);

       return view;
    }

If you add above code in fragment then all fragment are show in Landscape mode. But You want to a single fragment. so in Other Fragment add below code

     @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            // Inflate the layout for this fragment
            //ADD BELOW LINE
            getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 

            view = inflater.inflate(R.layout.fragment_inventory, container, false);


            return view;
        }

Note: No need to add Orientation in manifest.xml

Answer 3

I would extend the Fragment and create a BaseFragment for all my fragments. At this base fragment I would use the activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR

public abstract class BaseFragment extends Fragment {
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if(isVisibleToUser) {
            Activity a = getActivity();
            if(a != null)
             a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
        }
    }
}

For the specific locked fragment I would just use the activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE.

public class LandscapeFragment extends BaseFragment {
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if(isVisibleToUser) {
            Activity a = getActivity();
            if(a != null)
             a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        }
    }
}

The only change you would now have is to make all your fragments extend the BaseFragment instead of Fragment, but this can be beneficial in other shared features as well.

---

I am not familiar with Kotlin but Kotlin code may be like this:

abstract class BaseFragment : Fragment() {
  override fun setUserVisibleHint(isVisibleToUser : Boolean){
     super.setUserVisibleHint(isVisibleToUser)
     if(isVisibleToUser) {
       getActivity()?.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR)    
     }
  }
}

class LandscapeFragment : BaseFragment() {
    override fun setUserVisibleHint(isVisibleToUser : Boolean) {
        super.setUserVisibleHint(isVisibleToUser)
        if(isVisibleToUser) {
             getActivity()?.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
        }
    }
}