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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 David Barishev
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by jhild stack
, 11 months ago
Can't create handler inside thread that has not called Looper.prepare()
via xamarin.com by Unknown author, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by Robert Limanto
, 2 years ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by moovida
, 2 years 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()
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()	at android.os.Handler.(Handler.java:200)	at android.os.Handler.(Handler.java:114)	at android.app.Dialog.(Dialog.java:119)	at android.app.AlertDialog.(AlertDialog.java:200)	at android.app.AlertDialog.(AlertDialog.java:196)	at android.app.AlertDialog.(AlertDialog.java:141)	at android.app.ProgressDialog.(ProgressDialog.java:77)