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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.

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Can't create handler inside thread that has not called Looper.prepare()
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Can't create handler inside thread that has not called Looper.prepare()
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via Stack Overflow by Tom
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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.content.AsyncQueryHandler.(AsyncQueryHandler.java:125)