// method to send the photo to Custom Vision
public async void SendPhoto(byte[] image)
{
var current = CrossConnectivity.Current.IsConnected;
// check for the internet connection
if (!current)
{
await App.Current.MainPage.DisplayAlert("Connection Error", "Please connect to the internet", "OK");
}
else
{
var results = await CustomVisionService.PredictImageContentsAsync(image);
String resultInString = results.ToString();
if (resultInString.Length > 0)
{
if (Geolocation.HasMoreOptions(resultInString))
{
DialogService.ShowLoading("More Restaurants Available");
resultInString = await Geolocation.GetCloserOptionAsync(resultInString);
}
var navigationPage = new NavigationPage(new RestaurantPage(resultInString));
DialogService.HideLoading();
await App.Current.MainPage.Navigation.PushModalAsync(navigationPage, true);
var error = new NSError();
var device = captureDeviceInput.Device;
device.LockForConfiguration(out error);
device.FlashMode = AVCaptureFlashMode.Off;
device.UnlockForConfiguration();
}
else
{
DialogService.HideLoading();
await App.Current.MainPage.DisplayAlert("Restaurant Not Found", "Please rescan the Logo", "OK");
}
}
}
private async void TakePhotoButtonTapped(object sender, EventArgs e)
{
var current = CrossConnectivity.Current.IsConnected;
// check the internet connection to use the ResDiary API
if (!current)
{
await App.Current.MainPage.DisplayAlert("Connection Error", "Please connect to the internet", "OK");
}
else
{
try
{
var parameters = camera.GetParameters();
parameters.FlashMode = global::Android.Hardware.Camera.Parameters.FlashModeOff;
camera.SetParameters(parameters);
camera.StopPreview();
DialogService.ShowLoading("Scanning Logo");
// crop the image into the sqaure in order to make the prediction more accuracy
var image = CropImage(textureView.Bitmap);
using (var imageStream = new MemoryStream())
{
await image.CompressAsync(Bitmap.CompressFormat.Jpeg, 50, imageStream);
image.Recycle();
imageBytes = imageStream.ToArray();
}
// send the image to CustomVision in form of bytes
var results = await CustomVisionService.PredictImageContentsAsync(imageBytes);
String resultInString = results.ToString();
if (resultInString.Length > 0)
{
// if the logo appeared more than 1 result than use the Geolocation
if (Geolocation.HasMoreOptions(resultInString))
{
DialogService.ShowLoading("More Restaurants Available");
resultInString = await Geolocation.GetCloserOptionAsync(resultInString);
}
var navigationPage = new NavigationPage(new RestaurantPage(resultInString));
DialogService.HideLoading();
camera.StartPreview();
await App.Current.MainPage.Navigation.PushModalAsync(navigationPage, true);
}
else
{
DialogService.HideLoading();
camera.StartPreview();
await App.Current.MainPage.DisplayAlert("Restaurant Not Found", "Please re-scan the Logo", "OK");
}
}
catch (Exception)
{
camera.StopPreview();
camera.Release();
camera = global::Android.Hardware.Camera.Open((int)cameraType);
camera.SetPreviewTexture(surfaceTexture);
PrepareAndStartCamera();
}
}
}