AppModule - Used to inject fragments, service, activities with other modules

AppModule.java

@Module(includes = {
  AndroidInjectionModule.class, RepositoryModule.class,
  MySharedPreferencesModule.class
  ViewModelModule.class, LocalRepositoryModule.class, MQTTModule.class
})
abstract class AppModule {
     /*
   * Singleton annotation isn't necessary since Application instance is unique but is here for
   * convention. In general, providing Activity, Fragment, BroadcastReceiver, etc does not require
   * them to be scoped since they are the components being injected and their instance is unique.
   *
   * However, having a scope annotation makes the module easier to read. We wouldn't have to look
   * at what is being provided in order to understand its scope.*/

  abstract Application application(SmartHomeApplication app);
  
  // Injecting Activities
  @PerActivity
  @ContributesAndroidInjector(modules = { ActivityModule.class })
  abstract SplashScreenActivity splashScreenActivityInjector();

  @PerActivity
  @ContributesAndroidInjector(modules = { ActivityModule.class })
  abstract HomeScreenActivity mainActivityInjector();

  @PerActivity
  @ContributesAndroidInjector(modules = {ActivityModule.class})
  abstract LoginActivity loginActivityInjector();

  @PerActivity
  @ContributesAndroidInjector(modules = {ActivityModule.class})
  abstract RegistrationActivity registrationActivityInjector();
  
  // Injecting Services
  @PerService
  @ContributesAndroidInjector
  abstract VoiceProcessingService voiceProcessingServiceInjector();
  
  // Injecting Fragments
  @ContributesAndroidInjector
  abstract MyFavoritesFragment myFavoritesFragmentInjector();
}