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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 Stack Overflow by Vinod Mathu
, 11 months ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by ojacquemart
, 2 months ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by Pegasus system
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Can't create handler inside thread that has not called Looper.prepare()
via GitHub by mkeresztes
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Can't create handler inside thread that has not called Looper.prepare()
via GitHub by PaNaVTEC
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by Ankur
, 1 week ago
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.widget.Toast$TN$2.(Toast.java:341)	at android.widget.Toast$TN.(Toast.java:341)	at android.widget.Toast.(Toast.java:103)	at android.widget.Toast.makeText(Toast.java:262)	at com.brommko.android.bankalerts.firebase.MyFirebaseInstanceIDService.sendRegistrationToServer(MyFirebaseInstanceIDService.java:46)	at com.brommko.android.bankalerts.firebase.MyFirebaseInstanceIDService.onTokenRefresh(MyFirebaseInstanceIDService.java:31)	at com.google.firebase.iid.FirebaseInstanceIdService.zza(Unknown Source)	at com.google.firebase.iid.FirebaseInstanceIdService.zzm(Unknown Source)	at com.google.firebase.iid.zzb$2.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)	at java.lang.Thread.run(Thread.java:761)