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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 nikitaog.me by Unknown author, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by Amar
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by user3482237
, 2 years ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by masterblaster79
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via forundex.ru by Unknown author, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via forundex.ru by Unknown author, 1 year 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:121)	at android.widget.Toast$TN.(Toast.java:322)	at android.widget.Toast.(Toast.java:91)	at android.widget.Toast.makeText(Toast.java:238)	at com.example.testapp.MyActivity$MyAsyncTask.doInBackground(MyActivity.java:25)	at com.example.testapp.MyActivity$MyAsyncTask.doInBackground(MyActivity.java:21)