没有@Inject 构造函数或@Provides-annotated 方法无法提供Android Dagger 2.11

Question

在我的项目中，我使用 Salut 库来使用 wi-fi direct。下面是类构造函数：

public Salut(SalutDataReceiver dataReceiver, 
             SalutServiceData salutServiceData, 
             SalutCallback deviceNotSupported) {
...
}

类 SalutDataReceiver 作为参数接受对活动的引用。他还接听电话。下面是类构造函数：

public SalutDataReceiver(Activity activity, SalutDataCallback dataCallback) {
}

由于与活动有严格的联系，我假设这个对象应该从外部转移。下面是模块和组件的类：

@Module
public class WifiCommunicationModule {

    public WifiCommunicationModule() {

    }

    @Provides
    @Singleton
    public Salut provideSalut(SalutDataReceiver dataReceiver) {
        SalutServiceData serviceData = new SalutServiceData("testService", 50489, "test");
        return new Salut(dataReceiver, serviceData, null);
    }
}


 @Singleton
 @Component(modules = {
            AppModule.class,
            WifiCommunicationModule.class
    })
    public interface MainComponent {
        void inject(MainActivity activity);
    }


public class MainActivity extends AppCompatActivity {

    @Inject
    Salut salut;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


    }
}

但在编译时抛出异常：

Error:(25, 10) error: com.peak.salut.SalutDataReceiver 不能 在没有 @Inject 构造函数或从 @Provides-annotated 的情况下提供 方法。 com.peak.salut.SalutDataReceiver 被注入 com.test.modules.WifiCommunicationModule.provideSalut(dataReceiver) com.peak.salut.Salut 注入于 com.test.views.activities.MainActivity.salut com.test.views.activities.MainActivity 被注入 com.test.components.MainComponent.inject(活动)

更新

先生。 @Zayniddin Mamarasulov 建议您从 SalutDataReceiver 创建一个派生类，并将构造函数标记为 @Inject。但不幸的是，这也不起作用

public class SalutDataReceiverExtension extends SalutDataReceiver {

    @Inject
    public SalutDataReceiverExtension(Activity activity, SalutDataCallback dataCallback) {
        super(activity, dataCallback);
    }
}


@Module
public class WifiCommunicationModule {

    public WifiCommunicationModule() {

    }

    @Provides
    @Singleton
    public Salut provideSalut(SalutDataReceiverExtension dataReceiver) {
        SalutServiceData serviceData = new SalutServiceData("testService", 50489, "test");
        return new Salut(dataReceiver, serviceData, null);
    }
}

Error:(25, 10) error: android.app.Activity 不能没有 @Inject 构造函数或来自 @Provides 注释的方法。 android.app.Activity 被注入在 com.test.implementation.SalutDataReceiverExtend.（活动，...） com.test.implementation.SalutDataReceiverExtend 被注入 com.test.modules.WifiCommunicationModule.provideSalut(dataReceiver) com.peak.salut.Salut 注入于 com.test.views.activities.MainActivity.salut com.test.views.activities.MainActivity 被注入 com.test.components.MainComponent.inject(活动)

Answer 1

像这样在 SalutDataReceiver 的构造函数中添加@Inject 注解：

@Inject
public SalutDataReceiver(Activity activity, SalutDataCallback dataCallback) {
}