如何使用Dagger2注入我的Retrofit DataService

@Module
public class RetrofitModule {
    @Provides
    public Retrofit provideRetrofit() {
        return new Retrofit.Builder()
                .baseUrl("https://api.example.com/")
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }
}

@Module
public class DataServiceModule {
    @Provides
    public DataService provideDataService(Retrofit retrofit) {
        return retrofit.create(DataService.class);
    }
}

@Component(modules = {RetrofitModule.class, DataServiceModule.class})
public interface AppComponent {
    void inject(MainActivity activity);
}

public class MainActivity extends AppCompatActivity {
    @Inject
    DataService dataService;

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

        // 创建Dagger2的AppComponent实例
        AppComponent appComponent = DaggerAppComponent.create();
        // 注入MainActivity实例
        appComponent.inject(this);

        // 现在可以使用dataService进行网络请求了
        // dataService.doSomething();
    }
}