如何避免为每个视图添加注入方法？

Question

目前,要在活动中获取Picasso的实例,我需要向AppComponent添加注入方法.如何避免添加inject方法,因为我有很多片段和视图应该注入:

AppComponent.class:

@ForApplication
@Singleton
@Component(
        modules = {AppModule.class,OkHttpClientModule.class,NetworkApiModule.class,NetworkAuthModule.class})
public interface AppComponent {
    void inject(Fragment1 obj);
    void inject(Fragment2 obj);
    void inject(Fragment3 obj);
    void inject(Fragment4 obj);    
    void inject(Fragment5 obj);    
    void inject(Fragment6 obj);
    ...
    }

Fragment1.class

public class Fragment1 extends Fragment {
    @Inject Picasso mPicasso;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MyApplication.getComponent(getContext()).inject(this);
    }
}

我的课程 :

AppModule.class:

@Module
public class AppModule {
    private MyApplication mApplication;

    public AppModule(@NonNull MyApplication mApplication) {
        this.mApplication = mApplication;
    }

    @Provides
    @NonNull
    @Singleton
    public Application provideApplication() {
        return mApplication;
    }


   @Provides
   @ForApplication
    Context provideContext(){
        return mApplication;
    }

    @Provides
    @Singleton
    Picasso providesPicasso(@ForApplication Context context) {
        return new Picasso.Builder(context).build();
    }
}

ForApplication.class:

@Scope
@Retention(RUNTIME)
public @interface ForApplication {
}

MyApplication.class

public class MyApplicationextends Application {
    static Context mContext;
    private AppComponent component;
    @Override
    public void onCreate() {
        super.onCreate();
        mContext = this;

        setupComponent();
    }

    private void setupComponent() {
        component = DaggerAppComponent.builder().appModule(new AppModule(this)).build();
        component.inject(this);
    }

    public AppComponent getComponent() {
        if (component==null)
            setupComponent();
        return component;
    }



public static AppComponent getComponent(Context context) {
        return ((MyApplication) context.getApplicationContext()).getComponent();
    }

UPDATE

我还想为片段注入适配器,如果我要向BaseFragment添加注入,那么BaseFragment将为所有子片段提供所有适配器

Answer 1

我通过使用lombok 库添加委托类解决了这个问题

@Accessors(prefix = "m")
public class AdapterDelegate {
    @Getter @Inject Lazy<FlatAdapter> mFlatAdapterLazy;
    public AdapterDelegate(){
       MyApplication.getComponent(MyApplication.getContext()).inject(this);
    }

    public static AdapterDelegate get() {
        return new AdapterDelegate();
    }
}

并且在一个活动中

public class MainActivity extends Activity {
    FlatAdapter mFlatAdapter = AdapterDelegate.get().getFlatAdapterLazy().get();