Appcompat Mode_night_auto Not Working

AppCompatDelegate.MODE_NIGHT_AUTO is not updating my existing activity and I'm not sure why. I dynamically allow the user to change night mode. If the user changes the mode to auto

Solution 1:

In case anyone else wants to know what I did to solve this (not sure if it is the right way to do it though):

private int mCurrentNightMode;

@OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
   mCurrentNightMode = getCurrentNightMode();
}

@OverrideprotectedvoidonPostResume() {
    super.onPostResume();

    if (hasNightModeChanged()) {
        delayedRecreate();
    }

}

privatevoiddelayedRecreate() {
    Handler handler = newHandler();
    handler.postDelayed(this::recreate, 1);
}

privatebooleanhasNightModeChanged() {
    getDelegate().applyDayNight();
    return mCurrentNightMode != getCurrentNightMode();
}

private int getCurrentNightMode() {
    returngetResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
}

Solution 2:

It's been fixed in AppCompat 24.2.0. Revision history lists this as a "behaviour change" for 24.2.0:

If you use the appcompat library's day/night functionality, the system now automatically recreates your activity whenever the day/night mode changes (either because of the time of day, or because of a call to AppCompatDelegate.setLocalNightMode()).