public BarcodeScannerRenderer(Context context) : base(context)
{
MainLayout =
(ConstraintLayout)LayoutInflater.FromContext(context).Inflate(Resource.Layout.BarcodeTracker, null);
AddView(MainLayout);
CameraSourcePreview = MainLayout.FindViewById <CameraSourcePreview>(Resource.Id.preview);
CloseScannerButton = MainLayout.FindViewById <ImageButton>(Resource.Id.closeScannerBtn);
CloseScannerButton.Click += async delegate
{
await Xamarin.Forms.Application.Current.MainPage.Navigation.PopModalAsync();
};
MGraphicOverlay = MainLayout.FindViewById <GraphicOverlay>(Resource.Id.faceOverlay);
BarcodeDetector detector = new BarcodeDetector.Builder(Application.Context)
.Build();
detector.SetProcessor(
new MultiProcessor.Builder(new GraphicBarcodeTrackerFactory(MGraphicOverlay, this)).Build());
if (!detector.IsOperational)
{
// Note: The first time that an app using barcode API is installed on a device, GMS will
// download a native library to the device in order to do detection. Usually this
// completes before the app is run for the first time. But if that download has not yet
// completed, then the above call will not detect any barcodes.
//
// IsOperational can be used to check if the required native library is currently
// available. The detector will automatically become operational once the library
// download completes on device.
Android.Util.Log.Warn(TAG, "Barcode detector dependencies are not yet available.");
}
MCameraSource = new CameraSource.Builder(Application.Context, detector)
.SetAutoFocusEnabled(true)
.SetFacing(Android.Gms.Vision.CameraFacing.Back)
.SetRequestedFps(15.0f)
.Build();
var torchFab = FindViewById <FloatingActionButton>(Resource.Id.fab_torchlight);
var hasFlashlight = Context.PackageManager.HasSystemFeature(PackageManager.FeatureCameraFlash);
if (!hasFlashlight)
{
torchFab.Hide();
}
else
{
torchFab.Click += TorchFab_Click;
}
StartCameraSource();
}
private void Init()
{
mStartRequested = false;
mSurfaceAvailable = false;
mAppIdProcessor = new BarcodeDetectorProcessor(this);
mBarcodeDetector = new BarcodeDetector.Builder(Context)
.SetBarcodeFormats(BarcodeFormat.QrCode)
.Build();
mBarcodeDetector.SetProcessor(mAppIdProcessor);
mCameraBuilder = new CameraSource.Builder(Context, mBarcodeDetector)
.SetFacing(CameraFacing.Back)
.SetAutoFocusEnabled(true)
.SetRequestedFps(30.0f);
mSurfaceView = new SurfaceView(Context);
mSurfaceView.Holder.AddCallback(new SurfaceCallback(this));
AddView(mSurfaceView);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
// 스케너 사용 가능여부 확인
if (!CheckScannerStatus())
{
return;
}
if (CameraSource == null && Element.Width > 0 && Element.Height > 0)
{
// 바코드 검출 객체 설정 및 콜백 등록
BarcodeDetector = new BarcodeDetector
.Builder(Context)
.SetBarcodeFormats(Element.BarcodeFormats.ToVisionFormat())
.Build();
BarcodeDetector.SetProcessor(this);
this.Write("BarcodeDetector is created");
// 프리뷰어 사이즈 얻기
var previewerSize = Element.GetPreviewSize(Resources.DisplayMetrics);
this.Write($"Previewer size - Width : {previewerSize.Width}, Height : {previewerSize.Height}");
// 카메라 소스 생성
CameraSource = new CameraSource
.Builder(Context, BarcodeDetector)
.SetFacing(CameraFacing.Back)
.SetRequestedPreviewSize(previewerSize.Width, previewerSize.Height)
.SetRequestedFps(10.0f)
.Build();
this.Write("CameraSource is created");
}
switch (e.PropertyName)
{
case "IsTorchOn":
{
try
{
if (Element.IsScanning && Camera != null)
{
var parameters = Camera.GetParameters();
parameters.FlashMode = Element.IsTorchOn ? TorchOn : TorchOff;
Camera.SetParameters(parameters);
this.Write($"IsTorchOn : {Element.IsTorchOn}");
}
}
catch (Exception ex)
{
this.Write($"Camera exception : {ex.Message}, IsTorchOn : {Element.IsTorchOn}");
}
break;
}
case "IsPreviewing":
case "IsScanning":
{
try
{
if (Element.IsScanning && Element.IsPreviewing)
{
CameraSource?.Start(Control.Holder);
Camera = CameraSource?.GetCamera();
SetAutoFocusCallback();
}
else
{
Element.SetValue(BarcodeScanner.IsTorchOnProperty, false);
CameraSource?.Stop();
}
}
catch (Exception ex)
{
var toggleValue = e.PropertyName == "IsScanning"
? Element.IsScanning
: Element.IsPreviewing;
this.Write($"CameraSource exception : {ex.Message}, {e.PropertyName} : {toggleValue}");
}
this.Write($"{e.PropertyName} : {Element.IsScanning}");
break;
}
}
}
public override void OnBindElements(View view)
{
try
{
CameraPreview = view.FindViewById <SurfaceView>(Resource.Id.CameraPreview);
CameraPreviewProgressBar = view.FindViewById <ProgressBar>(Resource.Id.CameraPreviewProgressBar);
Vibrator = (Vibrator)Activity.GetSystemService(Context.VibratorService);
_callback = Arguments.GetBoolean(Constants.Callback);
if (_callback)
{
_onBarcodeReadListener = NavigationManager.LastFragment as IOnBarcodeReadListener;
}
#if DEBUG
_scannedBarcode = Guid.NewGuid().ToString();
var token = CancelAndSetTokenForView(CameraPreview);
if (!_callback)
{
Task.Run(async() =>
{
var result = await ProductService.GetProductByBarcode(_scannedBarcode, token);
if (result.Error.Any())
{
var message = Resources.GetString(Resource.String.ProductBarcodeNotFound);
ShowToastMessage(message);
return;
}
RunOnUiThread(() =>
{
NavigationManager.GoToProductDetails(result.Data);
});
}, token);
}
else
{
NavigationManager.GoToPrevious();
}
#else
var barcodeFormats = Arguments.GetIntArray(Constants.BarcodeFormats)
.Cast <BarcodeFormat>()
.Aggregate((acc, barfor) => acc | barfor);
BarcodeDetector = new BarcodeDetector.Builder(Context)
.SetBarcodeFormats(barcodeFormats)
.Build();
CameraSource = new CameraSource
.Builder(Context, BarcodeDetector)
.SetRequestedPreviewSize(640, 480)
.SetFacing(CameraFacing.Back)
.Build();
BarcodeDetector.SetProcessor(this);
CameraPreview.Holder.AddCallback(this);
CameraPreviewProgressBar.Visibility = ViewStates.Invisible;
#endif
}
catch (System.Exception ex)
{
ShowToastMessage(ex.Message, ToastLength.Long);
NavigationManager.GoToPrevious();
}
}
