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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 GitHub by Blithe0306
, 1 year ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by Summer006
, 1 year ago
via Stack Overflow by Leonard Febrianto
, 2 years ago
Can't create handler inside thread that has not called Looper.prepare()
via GitHub by mattpadams
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Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by RennerStudios
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Can't create handler inside thread that has not called Looper.prepare()
via Stack Overflow by LDG
, 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:200)	at android.os.Handler.(Handler.java:114)	at android.os.CountDownTimer$1.(CountDownTimer.java:114)	at android.os.CountDownTimer.(CountDownTimer.java:114)	at com.vilyever.socketclient.SocketClient$5.(SocketClient.java:449)	at com.vilyever.socketclient.SocketClient.getHearBeatCountDownTimer(SocketClient.java:449)	at com.vilyever.socketclient.SocketClient$DisconnectionThread.run(SocketClient.java:1048)