Lock screen orientation when targeting Android API 27 with a non-opaque activity

Question

I have an activity that has android:windowIsTranslucent set to true and android:windowBackground set to a translucent background. I ju

Answer 1

The solution worked for me is deleting

android:screenOrientation="portrait" 

from all the full screen transparent activities which means their theme contains

true

Also to make sure that orientation works correct for below Oreo I added this to the onCreate() of the activities.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // This activity is a fullscreen transparent activity, so after Oreo Android doesn't allow fullscreen
    // transparent activities to specify android:screenOrientation="portrait" in the manifest. It will pick up
    // from the background activity. But for below Oreo we should make sure that requested orientation is portrait.
    if (VERSION.SDK_INT < VERSION_CODES.O) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
}