android - 在 Binder 接口(interface)中返回服务实例是否安全？

Question

我有这样的服务:

public MyService extends Service {

    // ...

    IBinder binder = new MyBinder();

    @Override
    public IBinder onBind(Intent intent) {
        return binder;
    }

    public class MyBinder extends Binder {

        public MyService getService() {
            return MyService.this;
        }
    }

    // ...
}   

在 Activity 中，我收到 Binder 从而获得 Service 实例，之后我可以访问它的所有方法。我想知道，这样做安全吗？或者我应该只通过 Binder 接口(interface)与 Service 交互？谢谢!

Answer 1

In Activity I receive Binder thereby get Service instance, and after that I have access to all its methods. I want to know, is it safe to do like that? Or I should interact with Service only through Binder interface?

Binder 是返回的内容，您只需转换为您知道的服务类即可。你这样做的方式是只使用 Binder ......

您完成它的方式通常就是它的完成方式。这是直接取自此处找到的“官方”示例的“本地服务”模式:http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/app/LocalService.html在您的服务类上调用方法的其他方法非常老套(相信我，我以前尝试过)。

例子:

private ServiceConnection mConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {
            // This is called when the connection with the service has been
            // established, giving us the service object we can use to
            // interact with the service.  Because we have bound to a explicit
            // service that we know is running in our own process, we can
            // cast its IBinder to a concrete class and directly access it.
            myService = ((MyService.LocalBinder)service).getService();



        }

        public void onServiceDisconnected(ComponentName className) {
            // This is called when the connection with the service has been
            // unexpectedly disconnected -- that is, its process crashed.
            // Because it is running in our same process, we should never
            // see this happen.

        }
    };