Dagger 2 无法解析符号 'DaggerAppComponent'

Question

我正在尝试使用 retrofit 2、dagger 2 和 MVP 创建一个简单的应用程序，但我在与依赖项作斗争，实际上，这是我在尝试重建项目后遇到的错误 Error:Execution 失败对于任务“:app:compileDebugJavaWithJavac”。

java.lang.WhosebugError

以及在我提供 AppComponent 的 App class 中：无法解析符号 'DaggerAppComponent'

我将尝试向您展示我的项目，以便有人可以看到问题，第一个是我的 AppModule，其中包括 PresentationModule.class

@Module(includes = PresentationModule.class)
public class AppModule {
    private App app;

    public AppModule(App app) {
        this.app = app;
    }

    @Provides
    @Singleton
    public App provideApp() {
        return app;
    }
}

演示模块如下所示：

@Module(includes = InteractorModule.class)
public class PresentationModule {

    @Provides
    JokePresenter providePresenter(JokeInteractor jokeInteractor) {
        return new JokePresenterImpl(jokeInteractor);
    }
}

和交互模块：

@Module(includes = {NetworkModule.class, PresentationModule.class})
public class InteractorModule {

    @Provides
    JokeInteractor provideJokeInteractor(RetrofitService service, JokePresenter presenter) {
        return new JokeInteractorImpl(service, presenter);
    }
}

这是引用了视图和交互器的 JokePresenter：

public class JokePresenterImpl implements JokePresenter {

    private JokeView mJokeView;
    private List<String> mData = new ArrayList<>();
    private String mJoke;
    private JokeInteractor jokeInteractor;

    public JokePresenterImpl(JokeInteractor jokeInteractor) {
        this.jokeInteractor = jokeInteractor;
    }

    @Override
    public void setView(JokeView view) {
        this.mJokeView = view;
    }

    @Override
    public void getRandomJoke() {
        mJokeView.showProgress();
        jokeInteractor.getRandomJoke();
    }
}

以及具有 RetrofitService 和 JokePresenter 引用的 JokeInteractor：

public class JokeInteractorImpl implements JokeInteractor {

    private RetrofitService retrofitService;
    private JokePresenter presenter;

    public JokeInteractorImpl(RetrofitService service, JokePresenter presenter) {
        this.retrofitService = service;
        this.presenter = presenter;
    }

    @Override
    public void getRandomJoke() {
        retrofitService.getRandomJoke()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<RandomJokeResponse>() {
                    @Override
                    public void onCompleted() {
                        presenter.onRandomJokeCompleted();
                    }

                    @Override
                    public void onError(Throwable e) {
                        presenter.onError(e.getMessage());
                    }

                    @Override
                    public void onNext(RandomJokeResponse randomJokeResponse) {
                        presenter.onNextRandomJoke(randomJokeResponse);
                    }
                });
    }

Gradle 依赖关系：

  apt 'com.google.dagger:dagger-compiler:2.7'
  compile 'com.google.dagger:dagger:2.7'
  provided 'javax.annotation:jsr250-api:1.0'

    //retrofit
  compile 'com.squareup.retrofit2:retrofit:2.1.0'
  compile 'com.squareup.okhttp:okhttp:2.5.0'
  compile 'com.squareup.retrofit2:converter-gson:2.1.0'
  compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'

  //rx java
  compile 'io.reactivex:rxjava:1.1.6'
  compile 'io.reactivex:rxandroid:1.2.1'

 //dagger2
  compile 'com.google.dagger:dagger:2.0'
  provided 'org.glassfish:javax.annotation:10.0-b28'

有人能看出这里的问题吗？

Answer 1

查看执行情况：

@Module(includes = InteractorModule.class)
public class PresentationModule

和

@Module(includes = {NetworkModule.class, PresentationModule.class})
public class InteractorModule

你有循环依赖。您需要重新考虑您的设计。我建议将 Interactor 与 Presenter 解耦。

一个简单的解决方案：

将 getRandomJoke() 实现更改为 return Observable 并在 Presenter 内订阅它。并从 Interactor.

中删除 presenter 引用

互动者：

public class JokeInteractorImpl implements JokeInteractor {

    private RetrofitService retrofitService;

    public JokeInteractorImpl(RetrofitService service) {
        this.retrofitService = service;
    }

    @Override
    public Observable getRandomJoke() {
        return retrofitService.getRandomJoke()
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread());
    }
}

主持人：

@Override
public void getRandomJoke() {
    mJokeView.showProgress();
    jokeInteractor.getRandomJoke()
          .subscribe(new Observer<RandomJokeResponse>() {
                @Override
                public void onCompleted() {
                    onRandomJokeCompleted();
                }

                @Override
                public void onError(Throwable e) {
                    onError(e.getMessage());
                }

                @Override
                public void onNext(RandomJokeResponse randomJokeResponse) {
                    onNextRandomJoke(randomJokeResponse);
                }
            });
}

Answer 2

确保在您的 gradle

中添加依赖项

implementation 'com.google.dagger:dagger-android:2.15'
implementation 'com.google.dagger:dagger-android-support:2.13'
annotationProcessor 'com.google.dagger:dagger-android-processor:2.16'

Answer 3

确保在模块中添加 AndroidSupportInjectionModule::class。

像这样：

@Component(
    modules = [
        AndroidSupportInjectionModule::class,
       ....//Other module classes
    ]
)

Dagger 2 无法解析符号 'DaggerAppComponent'

Dagger 2 can not resolve symbol 'DaggerAppComponent'

mvp

android

dependency-injection

dagger-2