Dagger2 Error: Module Must Be Set

Question

我试图在 Dagger2 中做子范围。但是，我无法弄清楚这个编译错误：-> ...MyApplicationModule must be set 发生在我的 LogInFragment 中。如果有人会尝试阐明此错误。我真的很高兴。

这是 MyApplication Class:

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        MyInjector.initialize(this);
    }
}

这是 MyInjector Class:

public enum MyInjector {
    INSTANCE;

    MyApplicationComponent myApplicationComponent;


    private MyInjector() {
    }

    public static void initialize(MyApplication myApplication) {

        MyApplicationComponent myApplicationComponent = DaggerMyApplicationComponent.builder()
                .myApplicationModule(new MyApplicationModule(myApplication))
                .build();
        INSTANCE.myApplicationComponent = myApplicationComponent;
    }

    public static MyApplicationComponent get() {
        return INSTANCE.myApplicationComponent;
    }

}

这是 MyApplicationComponent Class:

@Component (modules = {MyApplicationModule.class}) 
public interface MyApplicationComponent { 

}

这是 MyApplicationModule Class

@Module
public class MyApplicationModule {

    private final MyApplication myApplication;

    public MyApplicationModule(MyApplication myApplication) {
        this.myApplication = myApplication;
    }

    @Singleton
    @Provides
    SharedPreferences providesSharedPreferences(Context context) {
        return context.getSharedPreferences("My_Pref", Context.MODE_PRIVATE);
    }

    @Singleton
    @Provides
    public Context providesMyApplicationContext() {
        return this.myApplication.getApplicationContext();
    }

    @Singleton
    @Provides
    public LocationManager providesLocationService(Context context) {
        return (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    }

    @Singleton
    @Provides
    public MyDatabaseManager providesMyDatabaseManager(Context context) {
        return MyDatabaseManager.getInstance(context);
    }

    @Singleton
    @Provides
    public AccountSystemModel providesAccountSystemModel(Context context) {
        return MyDatabaseManager.getInstance(context);
    }

    @Singleton
    @Provides
    public MyApplication providesMyApplication(){
        return this.myApplication;
    }

}

这是我尝试 Subscope

的地方

这是 MyLogIn 组件 Class

@Singleton
@Component(modules = {MyApplicationModule.class}, dependencies = {MyApplicationComponent.class})
public interface LogInComponent {
    LogInPresenter signInPresenter();
}

这就是 Compilation Error 发生的地方

这是MyLogInActivityFragment

@Override protected void injectDependencies() {
   logInComponent = DaggerLogInComponent.builder()
                    .myApplicationComponent(MyInjector.get())
                    .build();
}

Answer 1

您的 LogInComponent 取决于包含 MyApplicationModule 的 MyApplicationComponent。您也不应该在 LogInComponent 中声明相同的模块。删除它，它将编译。

另外，通过将它们添加到组件接口，确保在 MyApplicationComponent 中公开 LogInComponent 中所需的依赖项，如下所示：

@Component (modules = {MyApplicationModule.class}) 
public interface MyApplicationComponent { 
    Context context();
    SharedPreferences sharedPreferences();
    // ...
}

另一个提示——如果您需要 MyApplicationComponent 中的所有依赖项，您可能需要阅读 subcomponents。

Answer 2

错误可能是由 abstract class 模块引起的。 Dagger 不能使用抽象的模块类.

Dagger2 Error: Module Must Be Set

Dagger2 Error: Module Must Be Set

android

dagger

dagger-2