View zxingOverlay;

MobileBarcodeScanner scanner;

protected override void OnCreate(Bundle savedInstanceState)

{

  base.OnCreate(savedInstanceState);

  SetContentView(Resource.Layout.MainActivity);

  

  Button btnScan = this.FindControl<Button>("btnScan");

  btnScan.Click += (s, e) =>

  { 

    scanner = new MobileBarcodeScanner(); 

    Task t = new Task(AutoScan);

    t.Start();

  }; 

}

async void AutoScan()

{ 

  scanner.UseCustomOverlay = true;

  zxingOverlay = LayoutInflater.FromContext(this).Inflate(Resource.Layout.ZxingOverlay, null); 

  ImageView ivScanning = zxingOverlay.FindViewById<ImageView>(Resource.Id.ivScanning); 

  Button btnCancelScan = zxingOverlay.FindViewById<Button>(Resource.Id.btnCancelScan);

  btnCancelScan.Click += (s, e) =>

  {

    if (scanner != null)

    {

      scanner.Cancel();

    }

  };

 

  zxingOverlay.Measure(MeasureSpecMode.Unspecified.GetHashCode(), MeasureSpecMode.Unspecified.GetHashCode());

  int width = zxingOverlay.MeasuredWidth;

  int height = zxingOverlay.MeasuredHeight; 

 

  // 從上到下的平移動畫

  Animation verticalAnimation = new TranslateAnimation(0, 0, 0, height);

  verticalAnimation.Duration = 3000; // 動畫持續(xù)時間

  verticalAnimation.RepeatCount = Animation.Infinite; // 無限循環(huán)

 

  // 播放動畫

  ivScanning.Animation = verticalAnimation;

  verticalAnimation.StartNow();

      

  scanner.CustomOverlay = zxingOverlay;

  var mbs = MobileBarcodeScanningOptions.Default;

  mbs.AssumeGS1 = true;

  mbs.AutoRotate = true;

  mbs.DisableAutofocus = false;

  mbs.PureBarcode = false;

  mbs.TryInverted = true;

  mbs.TryHarder = true;

  mbs.UseCode39ExtendedMode = true;

  mbs.UseFrontCameraIfAvailable = false;

  mbs.UseNativeScanning = true;

 

  var result = await scanner.Scan(this, mbs);

  HandleScanResult(result);

 

} 

void HandleScanResult(ZXing.Result result)

{

  if (result != null && !string.IsNullOrEmpty(result.Text))

  {

    if (result.Text != null && result.Text.Trim().Length > 5)

    {

      this.RunOnUi(() => { this.ShowToast(result.Text); });

 

    }

    else

    {

      this.RunOnUi(() => { this.ShowToast("掃描無數據"); });

    }

  }

  else

  {

    this.RunOnUi(() => { this.ShowToast("掃描取消"); });

  }

  scanner.Cancel(); 

}