new a AsyncTask cause 'Can't create handler inside thread that has not called Looper.prepare()'

Can't create handler inside thread that has not called Looper.prepare()

There are a few threading rules that must be followed for this class to work properly:

The AsyncTask class must be loaded on the UI thread. This is done automatically as of

JELLY_BEAN

.
The task instance must be created on the UI thread.

execute(Params...)

must
be invoked on the UI thread.
Do not call

onPreExecute()

,

onPostExecute(Result)

,

doInBackground(Params...)

,

onProgressUpdate(Progress...)

manually.
The task can be executed only once (an exception will be thrown if a second execution is attempted.)