java - Dagger2将交互器注入(inject)到演示者中

我正在尝试设置MVP应用程序，我想将交互器注入Presenter类，而不是使用new关键字。

请参见下面的示例：

//演示者实现示例

public class ExamplePresenterImpl implements ExamplePresenter{

        private final Application application;
        private ExampleView exampleView;
        private ExampleInteractorImpl interactor;

        public ExamplePresenterImpl(Application application){
            this.application = application;
            // I WANT TO GET RID OF THIS AND INJECT INSTEAD.
            interactor = new ExampleInteractorImpl(application);
        }

        @Override
        public void setView(ExampleView exampleView){
            this.exampleView = exampleView;
        }

        public void callInteractorMethod(){
            // call Fetch method from Interactor
            interactor.fetchData();
        }

    }

//交互器

public class ExampleInteractorImpl implements ExampleInteractor {

        private final Application application;

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

        public List<String> fetchData(){
             // return value to the called function
        }

}

最佳答案

您可以将交互器传递到presenter的构造函数中：

public class MyPresenterImpl implements MyPresenter {
    private MyView view;
    private MyInteractor interactor;

    public MyPresenterImpl(MyView view, MyInteractor interactor) {
        this.view = view;
        this.interactor = interactor;
    }
}

然后在您的模块中：

@Singleton @Provides
public MyInteractor provideMyInteractor(Dependencies...){
    return new MyInteractorImpl(your_dependencies);
}

@Singleton @Provides
public MyPresenter provideMyPresenter(MyView view, MyInteractor interactor){
    return new MyPresenterImpl(view, interactor);
}

或者，您可以使用@Inject批注对Presenter和Interactor构造函数进行批注。

我以一个简单的登录页面为例，如果需要，您可以看一下：

https://github.com/omaflak/Dagger2-MVP