@Override
    protected void onPause() {
        super.onPause();
        fileFlush();
        stopService(new Intent(Fingerprinter.INTENT_START_SERVICE));
    }

    @Override
    protected void onResume() {
        super.onResume();
        registerReceiver(mReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION) );
        try {
            createFileOnDevice(true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }