当前,要在 Activity 中获取例如毕加索的实例,我需要向AppComponent添加注入(inject)方法。如何避免添加inject方法,因为我在应将其注入(inject)的地方有很多 fragment 和 View :
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);
}
}
我的类(class) :
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();
}
更新
我还希望为 fragment 插入适配器,如果我将Inject添加到BaseFragment,则BaseFragment将具有所有子 fragment 的所有适配器
最佳答案
一种解决方案是将继承用于注入(inject)。
只需使用@Inject Picasso实例定义一个BaseFragment,在DaggerComponent中为此BaseFragment创建一个注入(inject)方法,并在BaseFragment的onCreate方法中调用它。更具体的Fragment(例如Fragment1、2 ..)可以从此BaseFragment继承并使用Picasso实例。