如何保持对绑定服务的轮询？(How to keep polling a bound service?)

 我在互联网上查了一下，但找不到涵盖我的情景的例子。 我想做的是： 
 
 
 
 1）一旦我的活动开始（完成）就开始并绑定到服务 
 
 
 2）然后服务将自己绑定到另一个服务，寻找来自连接设备的用户输入，并将字符串保存到变量（完成） 
 
 
 3）我想将此字符串发送回活动，因此我可以检查它是什么，并基于它来进行网络呼叫。 
 
 
 现在排名第3）是我的挑战。 我设法用一个运行一秒钟的Timer，然后检查服务中写入的值，但不知怎的，这似乎不是正确的方式，我认为可能有一个更成熟的解决方案。 但是，我似乎无法弄明白。 
 
 我从文档中获取了代码，只添加了计时器。 在这个例子中只有一个服务只生成一个随机数（这通常会被我的第二个服务所取代）。 这是服务的代码： 
 
public class LocalService extends Service {

    private final IBinder mBinder = new LocalBinder();

    private final Random mGenerator = new Random();

    public class LocalBinder extends Binder {
        LocalService getService() {
            return LocalService.this;
        }
    }

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

    public int getRandomNumber() {
        return mGenerator.nextInt(100);
    }
}
 
 这是我活动中的代码： 
 
public class MainActivity extends AppCompatActivity {

    LocalService mService;
    boolean mBound = false;
    Timer timer;

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

        timer = new Timer();
    }

    @Override
    protected void onStart() {
        super.onStart();
        Intent intent = new Intent(this, LocalService.class);
        bindService(intent, mConnection, Context.BIND_AUTO_CREATE);

        timer.schedule(new MyTimerTask(new Handler(), this), 1000, 1000); // run on every second
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mBound) {
            unbindService(mConnection);
            mBound = false;
        }

        timer.cancel();
        timer.purge();
    }

    private class MyTimerTask extends TimerTask {
        Handler handler;
        MainActivity ref;

        public MyTimerTask(Handler handler, MainActivity ref) {
            super();
            this.handler = handler;
            this.ref = ref;
        }

        @Override
        public void run() {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    if (mBound) {
                        int num = ref.mService.getRandomNumber();
                        // just as an example, raise a toast to see if it works
                        // but otherwise the value will be handled
                        Toast.makeText(ref, "number: " + num, Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    }

    private ServiceConnection mConnection = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName className,
                                       IBinder service) {
            LocalService.LocalBinder binder = (LocalService.LocalBinder) service;
            mService = binder.getService();
            mBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            mBound = false;
        }
    };
}
 
 我的问题是：这是一个好的方法（它的工作原理）还是不好的，有什么选择？ 

I looked up on the internet, but couldn't find an example covering my scenario. What I am trying to do is:
 
 
 
1) To start and bind to a service as soon as my activity starts (done)
 
 
2) The service then binds itself to another service looking for a user input from a connected device, and saves a string a string to a variable (done) 
 
 
3) I would like to send back this string to the activity, so I can check what it is and based on it to make a network call.
 
 
Now number 3) is my challenge. I managed to do it with a Timer that runs for one second and then checks the value written in the service, but somehow this doesn't seem to be the right way and I think that there might be a more mature solution. However, I can't seem to figure it out.
 
I've taken the code from the documentation and only added the timer. It is just one service in this example that just generates a random number (this will normally be replaced by my second service). This is the code for the service:
 
public class LocalService extends Service {

    private final IBinder mBinder = new LocalBinder();

    private final Random mGenerator = new Random();

    public class LocalBinder extends Binder {
        LocalService getService() {
            return LocalService.this;
        }
    }

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

    public int getRandomNumber() {
        return mGenerator.nextInt(100);
    }
}
 
And this is the code in my activity:
 
public class MainActivity extends AppCompatActivity {

    LocalService mService;
    boolean mBound = false;
    Timer timer;

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

        timer = new Timer();
    }

    @Override
    protected void onStart() {
        super.onStart();
        Intent intent = new Intent(this, LocalService.class);
        bindService(intent, mConnection, Context.BIND_AUTO_CREATE);

        timer.schedule(new MyTimerTask(new Handler(), this), 1000, 1000); // run on every second
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mBound) {
            unbindService(mConnection);
            mBound = false;
        }

        timer.cancel();
        timer.purge();
    }

    private class MyTimerTask extends TimerTask {
        Handler handler;
        MainActivity ref;

        public MyTimerTask(Handler handler, MainActivity ref) {
            super();
            this.handler = handler;
            this.ref = ref;
        }

        @Override
        public void run() {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    if (mBound) {
                        int num = ref.mService.getRandomNumber();
                        // just as an example, raise a toast to see if it works
                        // but otherwise the value will be handled
                        Toast.makeText(ref, "number: " + num, Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    }

    private ServiceConnection mConnection = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName className,
                                       IBinder service) {
            LocalService.LocalBinder binder = (LocalService.LocalBinder) service;
            mService = binder.getService();
            mBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            mBound = false;
        }
    };
}
 
My question is: is this a good approach (it works) or is it bad and what's the alternative?