protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.FaceTracker);
mPreview = FindViewById <CameraSourcePreview> (Resource.Id.preview);
mGraphicOverlay = FindViewById <GraphicOverlay> (Resource.Id.faceOverlay);
var detector = new Android.Gms.Vision.Faces.FaceDetector.Builder(Application.Context).Build();
detector.SetProcessor(
new Android.Gms.Vision.MultiProcessor.Builder(new GraphicFaceTrackerFactory(mGraphicOverlay)).Build());
if (!detector.IsOperational)
{
// Note: The first time that an app using face 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 faces.
//
// 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, "Face detector dependencies are not yet available.");
}
mCameraSource = new Android.Gms.Vision.CameraSource.Builder(Application.Context, detector)
.SetRequestedPreviewSize(640, 480)
.SetFacing(Android.Gms.Vision.CameraFacing.Back)
.SetRequestedFps(30.0f)
.Build();
}
//==============================================================================================
// Camera Source Preview
//==============================================================================================
/**
* Starts or restarts the camera source, if it exists. If the camera source doesn't exist yet
* (e.g., because onResume was called before the camera source was created), this will be called
* again when the camera source is created.
*/
void StartCameraSource()
{
try {
mPreview.Start(mCameraSource, mGraphicOverlay);
} catch (Exception e) {
Android.Util.Log.Error(TAG, "Unable to start camera source.", e);
mCameraSource.Release();
mCameraSource = null;
}
}
public QRSurfaceView(Context context) : base(context)
{
//https://firebase.google.com/docs/ml-kit/android/read-barcodes
//FirebaseVisionImage image = FirebaseVisionImage.fromBitmap(bitmap);
if (detector == null)
{
detector
= new Android.Gms.Vision.Barcodes.BarcodeDetector
.Builder(Application.Context).SetBarcodeFormats(Android.Gms.Vision.Barcodes.BarcodeFormat.QrCode)
.Build();
if (!detector.IsOperational)
{
System.Diagnostics.Debug.WriteLine("android barcode detector is not operational");
return;
}
if (cameraSource == null)
{
cameraSource = new Android.Gms.Vision.CameraSource.Builder(Application.Context, detector).Build();
}
}
}
