Sending Message from Service to Activity

Question

I have a Service and i try to send message to my primary Activity just like this:

public void callAsynchronousTask() {
    final Handler handler = new Handler();
    Timer timer = new Timer();
    TimerTask doAsynchronousTask = new TimerTask() {
        @Override
        public void run() {
            handler.post(new Runnable() {
                public void run() {
                    try {
                        Message m = new Message();
                        m.arg1 = 10;
                        m.arg2 = 15;
                        handler.sendMessage(m);
                        Log.i("Sent", "!");

                    } catch (Exception e) {}
                }
            });
        }

};
timer.schedule(doAsynchronousTask, 0, 3000); 
}

How can i fetch this message data in my Activity ?

score 2 · Answer 1 · answered Feb 22 '13 at 14:25

In your activity, you should make a handler like this, and pass the reference to the handler to the service before you start it...

handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
    //msg.arg1
  }
};

but right now you are creating a handler inside the service but thats not what you wanted to do!

JoxTraex · Answer 2 · 2013-02-22T14:27:32.997

1

Another way would be to bind your Activity to your Service so that they can communicate.

Reference http://developer.android.com/reference/android/content/Context.html#bindService(android.content.Intent, android.content.ServiceConnection, int)

edited Feb 22 '13 at 14:27

answered Feb 22 '13 at 14:22

JoxTraex

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My question is how to fetch data from a sent message – Adam Varhegyi Feb 22 '13 at 14:25
1

Moreso you should be trying to figure out a better way to have your Activity communicate with your service. – JoxTraex Feb 22 '13 at 14:28
2

Jox's approach is what you want here. Read about [Bound Services here](http://developer.android.com/guide/components/bound-services.html) - you'll see that you can provide a callback method which in your instance can expose a ````getArgs(Integer...)```` method or better. +1 – BrantApps Feb 22 '13 at 14:32

score 0 · Answer 3 · answered Feb 22 '13 at 14:29

0

put your data in message.obj and take it from this field in your activity. Your data can be a class that you can define how you want it.

answered Feb 22 '13 at 14:29

Buda Gavril

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I need the code in my Activity, my problem is to receive the data, not to send it. – Adam Varhegyi Feb 22 '13 at 14:35
make your activity to implement Handler.Callback and put your code in method public boolean onMessage(Message message) – Buda Gavril Feb 22 '13 at 14:49

score 0 · Answer 4 · edited May 23 '17 at 10:27

0

There is simple example project (which is created by CommonsWare) which shows how to send messages from Service to Activity via Handler. Check it out

edited May 23 '17 at 10:27

Community

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answered Feb 22 '13 at 15:08

ashakirov

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score 0 · Answer 5 · answered Feb 25 '15 at 05:41

        //use this code to send data to activity

         Bundle data = new Bundle();
            data.putString("data", result);
            Message msg = Message.obtain();
            msg.setData(data);
            replyTo.sendMessage(msg);        //replyTo is handler declared in your main_Activity 






    //Pass this **replyTo** handler when you call your service from mainActivity..
          Handler replyTo= new Handler() {
            public void handleMessage(Message msg) {
            //get data here and do what you want..
        };
        };

Hope it helps..!

Sending Message from Service to Activity

5 Answers5