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    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 Google Groups by Alexey Tikhvinsky, 10 months ago
Can't create handler inside > thread that has not called Looper.prepare()
via Stack Overflow by wee.ryo
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by AnmAtAnm
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Android Enthusiasts by kanhaiyabgs
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by ila
, 1 month ago
Can't create handler inside thread that has not called Looper.prepare() 20
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:200)