dagger_singleton.java

@Singleton
class MyDatabase implements Database {
    
  @Inject
  MyDatabase(@Named("ApplicationContext") Context context) {
      // more code
  }
}

/**************************************************************/
@Module
class DatabaseModule {
    MyDatabase dbImpl;
  
    @Inject
    DatabaseModule(MyDatabase myDB) {
    	this.dbImpl = myDB;
    }
  
    @Provides
    @Singleton
    Database getDatabase() {
    	return dbImpl;
    }
}