Dagger2 injecting issue in the main activity when using retrofit android

Question

I am facing an issue when injecting the retrofit service object using dagger2. Here is the details of my scenario:

Retrofit WebService Class:

public interface WebService {                                                               
    Observable<Name> searchName(@Query("id") String id);
}

Here is SubModule class:

@Module
public class SetupModule {

    @Provides
   MainActivity provideWebService(WebService webService) {
        return new MainActivity(webService);
    }
}

Here is SubComponent class:

@SetupScope
@Subcomponent(modules = SubModule.class)
public interface SubComponent {
    MainActivity inject(MainActivity mainActivity);
}

Here is AppComponent Class:

@Singleton
@Component(modules = {
        AppModule.class,
        NetworkModule.class})
public interface AppComponent
{
    SubComponent plus(SubModule subModule);
}

Here is the component creation in BaseApplication Class:

 public SubComponent createSubComponent()
    {
        subComponent = appComponent.plus(new subModule());
        return subComponent;
    }

Here is the MainActivity class:

 public MainActivity(WebService webService) {
        this.webService = webService;
    }

@Override
    protected void onCreate(Bundle savedInstanceState) {
((BaseApplication) getApplication()).createSubComponent().inject(this);
}

I am getting the webservice nullpointerexception when trying to access the searchName method in WebService interface from MainActivity.

Please help me to find out why webservice object getting null?

Answer 1

I think, at first you should remove WebService from activity constructor, and initiate service something like that:

@Inject
WebService webService;