AndroidInjector <android.app.Activity>不能提供@ Provide或者@ Produces注解的方法

我在尝试从Dagger v2.11中获取新的Android Dagger类时遇到了错误。 我不确定问题是什么，因为我已经考虑到了https://google.github.io/dagger//android.html上的Android文档，仍然无法解决这个问题。 有关这个设置有什么问题的任何想法？

我的应用程序：

public class MyApplication extends Application implements HasActivityInjector { @Inject AndroidInjector<Activity> androidInjector; @Override public void onCreate() { super.onCreate(); AppInjector.init(this); } @Override public AndroidInjector<Activity> activityInjector() { return androidInjector; } } 

AppComponent：

 @Singleton @Component(modules = { AndroidSupportInjectionModule.class, AppModule.class, ActivityModule.class, }) public interface AppComponent { @Component.Builder interface Builder { @BindsInstance Builder application(Application application); AppComponent build(); } void inject(MyApplication myApplication); } 

ActivityModule：

 @Module abstract class ActivityModule { @ContributesAndroidInjector(modules = FragmentModule.class) abstract MainActivity contributeMainActivity(); // all other activities defined as above } 

FragmentModule：

 @Module abstract class FragmentModule { @ContributesAndroidInjector abstract MyFragment contributeMyFragment(); } 

AppInjector：

  public static void init(MyApplication myApplication) { DaggerAppComponent.builder().application(myApplication) .build().inject(myApplication); myApplication .registerActivityLifecycleCallbacks(new Application.ActivityLifecycleCallbacks() { @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) { handleActivity(activity); } @Override public void onActivityStarted(Activity activity) { } @Override public void onActivityResumed(Activity activity) { } @Override public void onActivityPaused(Activity activity) { } @Override public void onActivityStopped(Activity activity) { } @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) { } @Override public void onActivityDestroyed(Activity activity) { } }); } private static void handleActivity(Activity activity) { if (activity instanceof HasSupportFragmentInjector) { AndroidInjection.inject(activity); } if (activity instanceof FragmentActivity) { ((FragmentActivity) activity).getSupportFragmentManager() .registerFragmentLifecycleCallbacks( new FragmentManager.FragmentLifecycleCallbacks() { @Override public void onFragmentCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) { if (f instanceof Injectable) { AndroidSupportInjection.inject(f); } } }, true); } } 

的AppModule：

 @Module(includes = ViewModelModule.class) class AppModule { @Singleton @Provides UserDao provideUserDao(MyDatabase db) { return db.userDao(); } // all other DAOs } 

ViewModelModule：

 @Module abstract class ViewModelModule { @Binds @IntoMap @ViewModelKey(UserViewModel.class) abstract ViewModel bindUserViewModel(UserViewModel userViewModel); } 

主要活动：

 public class MainActivity extends AppCompatActivity implements HasSupportFragmentInjector { @Inject AndroidInjector<Fragment> androidInjector; @Override public AndroidInjector<Fragment> supportFragmentInjector() { return androidInjector; } } 

堆栈跟踪：

 Error:(29, 10) error: dagger.android.AndroidInjector<android.app.Activity> cannot be provided without an @Provides- or @Produces-annotated method. dagger.android.AndroidInjector<android.app.Activity> is injected at com.myapp.MyApplication.androidInjector com.myapp.MyApplication is injected at com.myapp.dagger.AppComponent.inject(myApplication) 

Answer 1

尝试将AndroidInjector替换为androidInjector变量的DispatchingAndroidInjector 。 这对我有用。 这是我的（kotlin）

 class PodcastApp : Application(), HasActivityInjector { @Inject lateinit var dispatchingAndroidInjector : DispatchingAndroidInjector<Activity> companion object { lateinit var instance: PodcastApp } override fun onCreate() { super.onCreate() instance = this FirebaseApp.initializeApp(this) if (BuildConfig.DEBUG) { Timber.plant(Timber.DebugTree()) Stetho.initializeWithDefaults(this) AppInjector.init(this) } } override fun activityInjector(): AndroidInjector<Activity> { return dispatchingAndroidInjector } 

}