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  1. ,
    via vogella.com by Unknown author

    Any worker thread runs in background, since it is not intended to loop, is not connected to a Looper.for example doInBackground(). its implementation returns will be passed to onPostExecute() which runs on the UI thread.

Solutions on the web

via Stack Overflow by Single-minded Heartsome
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by Unknown author, 2 years ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by jules43
, 3 weeks ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by Challice Genest
, 2 years ago
Can't create handler inside thread that has not called Looper.prepare()
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:197) at android.os.Handler.<init>(Handler.java:111) at android.app.Dialog.<init>(Dialog.java:111) at android.app.AlertDialog.<init>(AlertDialog.java:114) at android.app.AlertDialog$Builder.create(AlertDialog.java:931) at ir.blog.trafik.BackGround.onPreExecute(BackGround.java:88) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586) at android.os.AsyncTask.execute(AsyncTask.java:534) at ir.blog.trafik.locationService.json_maker(locationService.java:538) at ir.blog.trafik.locationService$1.run(locationService.java:588) at java.util.Timer$TimerImpl.run(Timer.java:284)