Dagger2 子组件错误 - 必须在何处注释方法 ArrayAdapter

Question

我使用 https://guides.codepath.com/android/Dependency-Injection-with-Dagger-2 的 dagger2 演示。我想在 DemoDaggerSubActivity.java.

中使用子组件进行 ArrayAdapter 注入

我的Application.java

@Override public void onCreate() {
    super.onCreate();

    mApplicationComponent = DaggerApplicationComponent.builder()
            .applicationModule(new ApplicationModule(this))
            .build();
}


public ApplicationComponent getApplicationComponent() {
    return mApplicationComponent;
}

我的MyActivityModule.java

@Module
public class MyActivityModule {
private final DemoDaggerSubActivity activity;

// must be instantiated with an activity
public MyActivityModule(DemoDaggerSubActivity activity) { this.activity = activity; }

@Provides
@MyActivityScope
@Named("my_list")
public ArrayAdapter providesMyListAdapter() {
    return new ArrayAdapter<String>(activity, android.R.layout.activity_list_item);
}

}

我的MyActivitySubComponent.java

@MyActivityScope
@Subcomponent(modules={ MyActivityModule.class })
public interface MyActivitySubComponent {
    @Named("my_list") ArrayAdapter myListAdapter();
}

我的ApplicationComponent.java

@Singleton
@Component( modules = {ApplicationModule.class} )
public interface ApplicationComponent {
void inject(DemoDaggerSubActivity activity);

// factory method to instantiate the subcomponent defined here (passing in the module instance)
MyActivitySubComponent newMyActivitySubcomponent(MyActivityModule activityModule);

}

我的DemoDaggerSubActivity.java

@Inject @Named("my_list")
ArrayAdapter arrayAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

((AttendanceApplication) getApplication()).getApplicationComponent().newMyActivitySubcomponent(new MyActivityModule(this)).inject(this);

}

项目重建后出现错误

我在哪里注释方法 ArrayAdapter ？

Answer 1

必须从 ApplicationComponent.java 中删除注入方法并将其放入 MyActivitySubComponent.java

新MyActivitySubComponent.java

@MyActivityScope
@Subcomponent(modules={ MyActivityModule.class })
public interface MyActivitySubComponent {

    void inject(DemoDaggerSubActivity activity);

    @Named("my_list") ArrayAdapter myListAdapter();
}

新ApplicationComponent.java

@Singleton
@Component( modules = {ApplicationModule.class} )
public interface ApplicationComponent {

    // factory method to instantiate the subcomponent defined here (passing in the module instance)
    MyActivitySubComponent newMyActivitySubcomponent(MyActivityModule activityModule);

}

Dagger2 子组件错误 - 必须在何处注释方法 ArrayAdapter

Dagger2 Subcomponent error - where have to annotate method ArrayAdapter

android

dagger

dagger-2