android - Allow rotation/landscape in one fragment

Question

My app has a single Activity with a FragmentPagerAdapter with four fragments (Using the ViewPagerIndicator library). One of these fragments has designs for both a separate portrait and landscape layout, the other three do not and need to be fixed to portrait orientation.

My thought was to set android:configChanges="orientation" in the manifest and call getActivity().setRequestedScreenOrientation() in the onResume() of all the fragments, locking to SCREEN_ORIENTATION_PORTRAIT in three of them but to SCREEN_ORIENTATION_UNSPECIFIED in the one that needs to allow rotation, but this doesn't work. The app remains in portrait mode.

Is there a way to achieve this?

It isn't actually necessary for the actual activity to rotate if there is anyway to allow a fragment to change orientation without its activity doing so, but I have not found anything mentioning this being possible. It would also be equally ok if the activity rotates since the tab bar will be hidden when in landscape orientation.

Answer 1

Override setUserVisibleHint() in each fragment.

In the portrait only fragments:

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if(isVisibleToUser) {
        Activity a = getActivity();
        if(a != null) a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
}

in the the portrait/landscape fragment:

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if(isVisibleToUser) {
        Activity a = getActivity();
        if(a != null) a.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
    }
}

This will allow the whole activity to rotate in one fragment, but fix it to portrait in others.