Android Dagger 2 Dependency Not Introduced

Question

I'm trying to use Dagger 2 in my applications, but I had problems with the entity repository, and I did not understand what I was missing.

Here is my application component:

@Singleton
@Component(
        modules = {
                AndroidModule.class,
                RepositoryModule.class
        }
)

public interface ApplicationComponent {
    void inject(AndroidApplication app);
    IDependenceyRepository dependencyRepository();
}

My modules:

@Module
public class RepositoryModule {
    @Provides @Singleton IDependenceyRepository provideDependendencyRepository(Context context) {
        return new DependencyRepository(context);
    }
}

@Module
public class AndroidModule {
    private final AndroidApplication app;

    public AndroidModule(AndroidApplication app) {
        this.app = app;
    }

    @Provides @Singleton Context provideApplicationContext() {
        return app;
    }
}

My AndroidApplication:

public class AndroidApplication extends Application {
    private ApplicationComponent component;

    @Override
    public void onCreate() {
        super.onCreate();
        setupGraph();
    }

    private void setupGraph() {
        component = DaggerApplicationComponent.builder()
                .androidModule(new AndroidModule(this))
                .repositoryModule(new RepositoryModule())
                .build();
        component.inject(this);
    }

    public ApplicationComponent component() {
        return component;
    }
}

And here is my activity:

public class MainActivity extends Activity {
    @Inject
    IDependenceyRepository repository;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.testRepository();
    }

    private void testRepository() {
        Dependency dep = new Dependency();
        dep.setDescription("XXX");
        dep.setName("AAAA");

        try {
            repository.save(dep);
            Log.d("", repository.queryAll().get(0).getName());
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

What happens is that I get a null pointer exception in the repository. It is not administered.

If I add this line, then:

repository = ((AndroidApplication) getApplication()).component().dependencyRepository();

This works, but the DI point should not worry about it, or am I mistaken about it?

I tried another example and tutorials, but I was not able to solve my problem.

Thanks in advance,

Answer 1

david.mihola : , @Inject, ( void inject(MyClass)) .

( , ), :

public class BaseActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ((AndroidApplication) getApplication()).component().inject(this);
    }
} 

:

void inject(BaseActivity);

, @Inject, :

public class ActualActivity extends BaseActivity {
    @Inject IDependenceyRepository repo;
}

, , , (, Dagger 1).