Splash Screen Recreating After Calling AppCompatDelegate.setDefaultNightMode

Question

I am using the AppCompatDelegate.setDefaultNightMode(mode); to set the Night Mode in my Android Application, whenever the user chooses any mode that preference configuration in the Shared Preferences on their device, now while I use the shared preferences to set the UI mode when the app starts from the Splash Screen Activity, the activity is getting recreated and then there are 2 instances of my app, as the Splash Screen intents to Landing Activity.

Here is my SplashScreen.java

  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash_screen);
        SharedPreferences prefs = getSharedPreferences(UI_MODE, MODE_PRIVATE);
        name = prefs.getString("uiMode", "System");
        applyUI();
        fireSplashScreen();
    }

    private void applyUI() {
        if (name.equals("Dark")){
            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
        }
        else if (name.equals("Light")){
            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
        }
        else {
            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
        }
 private void fireSplashScreen() {
         Intent i = new Intent(SplashScreen.this, Landing.class);
            startActivity(i);
            finish();
    }

What can I do to avoid creating multiple instances of the Landing Activity?

Answer 1

Make sure to call AppCompatDelegate.setDefaultNightMode() as soon as possible. E.g. before calling super.onCreate(). Ideally, you would want to call it in Application.onCreate(). Also, make sure to use the latest version of AppCompat (at least 1.1.0) or you might face this issue anyway.

See this answer for more details.