如何使用AndroidInjector在模块内部获取MainActivity

@module
public abstract class MainActivitymodule {
  @ContributesAndroidInjector
  abstract MainActivity contributesmainActivity();
}

@Singleton
@Component(modules = {
    AndroidSupporTinjectionModule.class,AndroidInjectionModule.class,AppModule.class,MainActivitymodule.class
})
public interface ApplicationComponent {
  void inject(BaseApplication baseApplication);

  @Component.builder
  interface Builder {
    @BindsInstance
    Builder application(Application application);

    ApplicationComponent build();
  }
}

@module
public abstract class AppModule {}

public class MainActivity extends AppCompatActivity implements 
  HasSupportFragmenTinjector {
  @Inject
  DispatchingAndroidInjector<Fragment> dispatchingAndroidInjector;
  @Inject
  whatever whatever;

  @Override
  protected void onCreate(Bundle savedInstanceStatE) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceStatE);
    setContentView(R.layout.activity_main);
  }

  @Override
  public AndroidInjector<Fragment> supportFragmenTinjector() {
    return dispatchingAndroidInjector;
  }
}


public class BaseApplication extends Application implements 
  HasActivityInjector {
  @Inject
  DispatchingAndroidInjector<Activity> dispatchingAndroidInjector;

  @Override
  public AndroidInjector<Activity> activityInjector() {
    return dispatchingAndroidInjector;
  }

  @Override
  public void onCreate() {
    DaggerApplicationComponent.builder()
            .application(this)
            .build()
            .inject(this);
    super.onCreate();
  }
}

public class whatever {
   private final FragmentManager fragmentManager;

   @Inject
   whatever(MainActivity mainActivity) {
    this.fragmentManager = mainActivity.getSupportFragmentManager();
   }
}

一个非常简单的例子.基本上连接所有能够获得对象的东西随着正确的片段管理器被注入.这没关系并且有效.

但是,如果我想在模块中使用主要活动怎么办？假设我想通过更改构造函数参数来实现whatever显式地将依赖项公开给片段管理器：

@Inject
whatever(FragmentManager fragmentManager) {...}

我现在需要提供这种依赖.怎么去做呢？所以我尝试了以下内容：

@module
public abstract class MainActivitymodule {
  @ContributesAndroidInjector
  abstract MainActivity contributesmainActivity();

  @Provides
  static FragmentManager providesFragmentManager(MainActivity activity) {
     return activity.getSupportFragmentManager();
  }
}

现在匕首抱怨它找不到MainActivity的@Providers.我认为@ContributesAndroidInjector方法能够提供活动.对于在第一种情况下注入依赖项没有问题,我也有点疑惑,但现在它无法做到.

我也尝试为此建立一个工厂,例如：

public FragmentManagerFactory {
   private final FragmentManager fm;

   @Inject
   FragmentManagerFactory(MainActivity mainActivity){
     this.fm = mainActivity.getSupportFragmentManager();
   }

   public FragmentManager get() {
     return fm;
   }
}

@module
public abstract class MainActivitymodule {
  @ContributesAndroidInjector
  abstract MainActivity contributesmainActivity();

  @Provides
  static FragmentManager providesFragmentManager(FragmentManagerFactory fragmentManagerFactory) {
     return fragmentManagerFactory.get();
  }
}

最终会出现同样的错误.

有没有人设法做到这一点？在它变得非常简单之前,只需使用MainActivity实例构建模块就可以将其存储在一个字段中并提供它.现在……一切都发生在窗帘后面.

非常感谢一些帮助！