Android: Only one Looper may be created per thread

Question

I am having a problem with Android looper. I have a class that has extended AsynTask. Inside doInBackground() method i have Looper.prepare() and some code below.

It runs well and good for the first time but after that it gives an exception " Only one Looper may be created per thread" .

There seems some solution to use Looper.quit() but i am unable to implement it.

Any help will be appreciated.

It does seem to me that Looper.quit() is what you needed here. In android API documentation, it is clearly stated that "Be sure to call loop() after calling this method, and end it by calling quit()". — onlygo, Oct 08 '10 at 07:39
I mean that i am not able to find quit() inside Looper. It shows getMainLooper, myLooper(), loop(), myQueue(), prepare(), prepareMainLooper() but not quit(). — viv, Oct 08 '10 at 07:58

score 3 · Answer 1 · edited Dec 14 '11 at 02:59

3

class LooperThread extends Thread {
      public Handler mHandler;

      public void run() {
          Looper.prepare();

          mHandler = new Handler() {
              public void handleMessage(Message msg) {
                  // process incoming messages here
              }
          };

          Looper.loop();
      }
  }

edited Dec 14 '11 at 02:59

Lalit Poptani

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answered Dec 14 '11 at 02:38

qjbagu

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score 0 · Answer 2 · answered Jan 15 '13 at 18:29

0

getActivity().runOnUiThread (new Thread(new Runnable() { 
    public void run() {
        Looper.myLooper();
        getActivity().invalidateOptionsMenu();
    }
}));

answered Jan 15 '13 at 18:29

Michael Assraf

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score 0 · Answer 3 · answered Sep 01 '15 at 11:59

0

Just add the following check.

 if (Looper.myLooper() == null)
     Looper.prepare();

answered Sep 01 '15 at 11:59

Aown Raza

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http://stackoverflow.com/questions/23038682/java-lang-runtimeexception-only-one-looper-may-be-created-per-thread/24115631#24115631 – Aown Raza Sep 01 '15 at 12:01

score 0 · Answer 4 · answered Jun 16 '11 at 13:40

0

Try...

Looper.getMainLooper().quit();

answered Jun 16 '11 at 13:40

sasykes

66
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Android: Only one Looper may be created per thread

4 Answers4