not called Looper.prepare() when running a Timer from CallBack

Question

I'm in this code I am cycling through an attaylist of objects and assigning each object a callback, yet when I get to using a CountDownTimer, it crashes with Can't create handler inside thread that has not called Looper.prepare()

    for ( final ABoxActor a : actList )
    {

        ActorDamageListener adl = new ActorDamageListener(){
            public void ActorDestroyCallback() {
                Log.e("KILLED", a.getBitmapName() );
            }

            public void ActorDamageCallback(float damage) {
                Log.e("DAMAGED "+String.valueOf(damage), a.getBitmapName() );
                a.setSpriteCurrentFrame(10);

                //// THROWS Can't create handler inside thread that has not called Looper.prepare()
                CountDownTimer t = new CountDownTimer(500,500){
                    @Override
                    public void onFinish() {
                        a.setSpriteCurrentFrame(15);
                    }
                    @Override
                    public void onTick(long millisUntilFinished) {
                    }}.start();
                /////////////////////////////////       

            }
        };

        a.setListener(adl); 
    }

Any ideas what would be the easiest way to fix that? Can I somehow add this "looper" to my callback definition?

Thanks!

My answer here should help you: http://stackoverflow.com/questions/10403858/java-cant-create-handler-inside-thread-that-has-not-called-looper-prepare/10404099#10404099 — DeeV, Jun 11 '12 at 19:01

score 3 · Accepted Answer · answered Jun 11 '12 at 18:50

3

You are probably calling this code in your own thread. Each thead needs to have a Looper attached to be able to let a handler call back into the ui thread. Therefore you have to call Looper.prepare() to setup you looper so that the handler can call back to your ui thread.

answered Jun 11 '12 at 18:50

Moritz

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Thanks! :) But... how do I setup this looper? Simply adding "Looper.prepare();" gives "Only one Looper may be created per thread" error. – Roger Travis Jun 11 '12 at 18:59
I would expect that the thread calling your actordamangelistener needs to have a looper. – Moritz Jun 11 '12 at 19:17
hmm... tried adding this "Looper.prepare();" everywhere within the thread, still throws "Only one Looper may be created per thread" :) – Roger Travis Jun 11 '12 at 19:23

not called Looper.prepare() when running a Timer from CallBack

1 Answers1