protected override void OnDestroy()
{
base.OnDestroy();
_scannerManager.ScanReceived -= OnScanReceived;
_scannerManager.Dispose();
_scannerManager = null;
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
_scannerManager = new BarcodeScannerManager(this);
_scannerManager.ScanReceived += OnScanReceived;
var toggleScannerButton = FindViewById <Button>(Resource.Id.toggle_scanner_button);
toggleScannerButton.SetOnClickListener(this);
}