Java 匕首注入类使用匕首保持为空

我正在尝试将

CacheManager

的一个实例注入

getTorDepository

哪个Dagger可能成功，因为我没有收到任何与Dagger相关的错误。但是在

getTorDepository

中使用

cacheManager

时，我会得到一个NullPointerException

public class GetTodoRepository {

    @Inject
    public CacheManager cacheManager;

    public RetrofitService retrofitService;
    private ResultListener listener;

    public GetTodoRepository(@NonNull ResultListener listener) {
        this.retrofitService = new RetrofitService();
        this.listener = listener;
    }
}

@Module
public class AppModule {

    private Application application;

    public AppModule(Application application) {
        this.application = application;
    }

    @Provides
    @Singleton
    public Context providesApplicationContext() {
        return application.getApplicationContext();
    }

    @Provides
    @Singleton
    public CacheManager provideCacheManager(Context Context) {
        return new CacheManager(Context);
    }

}



@Singleton
@Component(modules = AppModule.class)
public interface TodoComponents {
    void inject(MainViewModel mainViewModel);
    void inject(CacheManager cacheManager);
    void inject(GetTodoRepository getTodoRepository);
    void inject(PostTodoRepository postTodoRepository);
}

1）在应用程序类中设置匕首（组件）

public class TodoApplication extends Application {

private static AppComponent components;

@Override
public void onCreate() {
    super.onCreate();
    components = DaggerAppComponent.builder()
            .appModule(new AppModule(this))
            .build();
}


public static AppComponent getAppComponent() {
    return components;
}

public GetTodoRepository(@NonNull ResultListener listener) {
    this.listener = listener;
    TodoApplication.getAppComponent().inject(this);
}

}

2）从注入目标类中的

应用程序

类调用

组件

对象

public class TodoApplication extends Application {

private static AppComponent components;

@Override
public void onCreate() {
    super.onCreate();
    components = DaggerAppComponent.builder()
            .appModule(new AppModule(this))
            .build();
}


public static AppComponent getAppComponent() {
    return components;
}

public GetTodoRepository(@NonNull ResultListener listener) {
    this.listener = listener;
    TodoApplication.getAppComponent().inject(this);
}

---

您的组件看起来像什么？@Md.Asaduzzaman组件类现在在问题中可见，您必须将

getToOrepository

注入dagger。你做了吗？@Md.Asaduzzaman我只做了我粘贴的东西。给匕首注射是什么意思？