Question

A user is getting an error on their phone when executing the code below, I am checking to see if the user is currently on a call or not before I run an AsyncTask making a Web Service call. The reason I am doing this is because some people are losing internet connection when on a call so i check every 5 seconds to see if they are on a call or not. If they are not then AsyncTask gets called

do{
        Handler handler = new Handler();
        handler.postDelayed(new Runnable(){

            @Override
            public void run() {

                 onCall = ((TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE))
                        .getCallState() != TelephonyManager.CALL_STATE_IDLE;
                 if(!onCall){
                     new CallRegWS().execute();
                 }  
            }
        },5000);
    }while(onCall);

I do not have the full stack trace only this showing me the error

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

obviously not too helpful but that is all I have to go on. they keep getting that error so it must be happening when I create the handler.

All this is done in the main thread so I dont know what the problem is, any insight on how I could fix this?

Update
this is called from a service and the method is in a separate class

Answer 1

Try Handler handler = new Handler(Looper.getMainLooper());

Also, see this post regarding this error: http://levinotik.com/loopers-handlers-runtimeexceptions-explained/