So i'm developing an app with mvp pattern and i'm having issues using Dagger2
I have created an interface for my presenter called HelloPresenter.
And then i created an implementation for that interface called HelloPresenterImpl
My HelloPresenter
public interface HelloPresenter {
public void sayHello();
}
My HelloPresenterImpl
public class HelloPresenterImpl implements HelloPresenter {
StoryView storyView;
@Inject
public HelloPresenterImpl(StoryView storyView) {
this.storyView = storyView;
}
@Override
public void sayHello() {
Log.d(TAG, "hello there");
}
}
My component
@UserScope
@Component(dependencies = NetComponent.class, modules = RetrofitModule.class)
public interface StoryComponent {
void inject(MainActivity activity);
void inject(HelloPresenter helloPresenter);
}
My module
@Module
public class HelloModule {
@Provides
public HelloPresenter providesHelloPresenter(final HelloPresenterImpl presenter){
return presenter;
}
}
My BaseApplication
public class BaseApplication extends Application {
private NetComponent mNetComponent;
private StoryComponent mStoryComponent;
@Override
public void onCreate() {
super.onCreate();
mNetComponent = DaggerNetComponent.builder()
.appModule(new AppModule(this))
.netModule(new NetModule())
.build();
mStoryComponent = DaggerStoryComponent.builder()
.netComponent(mNetComponent)
.retrofitModule(new RetrofitModule())
.storyModule(new StoryModule())
.build();
}
public NetComponent getNetComponent() {
return mNetComponent;
}
public StoryComponent getStoryComponent() {
return mStoryComponent;
}
Now, when i try to inject it in my MainActivity, it throws an Error saying
Error:(18, 10) error: com.exampleapp.Hello.presenter.HelloPresenter cannot be provided without an @Provides- or @Produces-annotated method. com.exampleapp.Hello.presenter.HelloPresenter is injected at com.exampleapp.Hello.MainActivity.HelloPresenter com.exampleapp.Hello.MainActivity is injected at com.exampleapp.di.components.HelloComponent.inject(activity)
public class MainActivity extends AppCompatActivity {
@Inject
SharedPreferences mSharedPreferences;
@Inject
StoryInterface storyInterface;
@Inject
HelloPresenter helloPresenter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
((BaseApplication) getApplication()).getStoryComponent().inject(this);
helloPresenter.sayHello(); // This throws an Error
}
Please can someone point me in the right direction? Thanks
Without seeing the whole project, my guess is Dagger can't figure how to create HelloPresenterImpl instance because you don't provide StoryView. I think you'll need:
@Provides
public StoryView providesStoryView() {
return new StoryView();
}