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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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via GitHub by kasim1011
, 1 year ago
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()	at android.os.Handler.(Handler.java:121)	at android.os.AsyncTask$InternalHandler.(AsyncTask.java:607)	at android.os.AsyncTask$InternalHandler.(AsyncTask.java:607)	at android.os.AsyncTask.(AsyncTask.java:190)	at android.content.ContentProvider.attachInfo(ContentProvider.java:929)	at android.app.ActivityThread.installProvider(ActivityThread.java:4260)	at android.app.ActivityThread.acquireProvider(ActivityThread.java:4058)	at android.app.ContextImpl$ApplicationContentResolver.acquireProvider(ContextImpl.java:1618)	at android.content.ContentResolver.acquireProvider(ContentResolver.java:949)	at android.content.ContentResolver.acquireContentProviderClient(ContentResolver.java:984)	at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:245)