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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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  • java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>( at android.bluetooth.BluetoothAdapter$1.<init>( at android.bluetooth.BluetoothAdapter.<init>( at android.bluetooth.BluetoothAdapter.getDefaultAdapter( at at

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