How to quit from a looper?

Question

1. Looper.prepare();
2. Handler mHandler = new Handler() {
3. public void handleMessage(Message msg) {}
4. };
5. mHandler.post(gpsLocationListenerThread);
6. Looper.loop();
7.

I'm calling a Thread class from AsyncTask. When i call it using code from 1-6, it creates the Thread and runs it. But AsyncTask get stucked there. I need to run this other Thread without blocking my AsyncTask. How to make it happen?

public GPSLocationListenerThread(Context context){
    this.context = context;
    mlocManager = (LocationManager)context.getSystemService(context.LOCATION_SERVICE);
    mlocListener = new GPSLocationListener();
}

public void setHandler(Handler _h){
    this.mHandler = _h;
}

public void run(){
    mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 100, mlocListener); // in 1000 mseconds or in 100m change
    mlocManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 10000, 100, mlocListener); // in 1000 mseconds or in 100m change
    //mHandler.getLooper().quit();
    while (DataHolder.getDataHolderObject().isTripStarted()){
        try {
            this.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    mlocManager.removeUpdates(mlocListener);
}

9 times out of 10 there is no need to call a Thread from an AsyncTask What are you trying to do ? — njzk2, Oct 05 '12 at 11:58
I need to start the GPS Location listener depends on some other variable changers. AsyncTask is listening to those changers. But GPS Litener cannot be started from AsncTask either. — dinesh707, Oct 05 '12 at 12:01

score 0 · Answer 1 · answered Oct 05 '12 at 12:01

0

Well you need to call Looper.quit(); anyway or it will never quit. Where you need to call it i have no idea unless you post a bit more code :)

answered Oct 05 '12 at 12:01

Anders Vedal Pettersen

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I tried to call it at line 7, but i think it do not move to line 7 until the thread finishes. – dinesh707 Oct 05 '12 at 12:04
Can you post the gpsLocationListenerThread class? or at least parts of it if it's confidential – Anders Vedal Pettersen Oct 05 '12 at 12:09
I added the whole class. I have commented out one single line i tired. But it didnt work – dinesh707 Oct 05 '12 at 12:16
can you try adding this: try { Log.i("asd","here"); this.sleep(5000); } – Anders Vedal Pettersen Oct 05 '12 at 12:17
i tired it. It keeps waking up every 5 seconds. Nothing has happened from the quit command. – dinesh707 Oct 05 '12 at 12:18
Well, the first thing that comes to mind would be having the sleep(5000) just before/after mHandler.post(gpsLocationListenerThread);. But i'm not really sure tbh :/ sorry – Anders Vedal Pettersen Oct 05 '12 at 12:21

score 0 · Answer 2 · edited May 23 '17 at 12:28

0

Contrary to the documentation, it's not always needed to quit a looper.
And if you insist - you must call it on the same thread of the looper.
See my elaborate answer here.

edited May 23 '17 at 12:28

Community

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answered Nov 22 '13 at 00:19

Amir Uval

14,425
4
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How to quit from a looper?

2 Answers2