Question

我在项目中使用Roboguice进行DI。根据android文档，只能存在一个应用程序实例。但是操作系统和Roboguice创建的实例是不同的。

如何强制Roboguice注入由OS创建的应用程序并禁用新实例的创建？

一些代码说明了下面的情况

public class MyApplication extends Application {

    public static MyApplication getInstance() {
        if (instance == null) {
            throw new IllegalStateException("Application isn't initialized yet!");
        }
        return instance;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        instance = this;
    }
}

public class MyActivity extends RoboActivity {

    // roboApp and osApp two different objects but expected that roboApp the same as osApp        

    @Inject
    private MyApplication roboApp;

    private MyApplication osApp = MyApplication.getInstance();

}

Answer 1

RoboGuice不会致电MyApplication.getInstance()，而是致电new MyApplication()

您可以编写一个调用MyApplication.getInstance()的提供程序。这看起来像是：

 public MyAppProvider implements Provider<MyApplication> {
     @Override
     public MyApplication get() {
         return MyApplication.getInstance();
     }
 }

然后，您可以在模块中将其绑定为：bind(MyApplication.class).toProvider(MyAppProvider.class);

Roboguice创建自己的Application类实例

1 个答案: