BarcodeScanner using GoogleVision API for Xamarin Forms Works on Android and iOS 10+
For Android, it use Xamarin.GooglePlayServices.Vision For iOS, it use GoogleMobileVision under MLKit library
Please feel free to improve my source code.
4.2.2.3
https://github.com/JimmyPun610/BarcodeScanner.XF/tree/master/ReleaseNotes
- Install Nuget package to Forms, Android and iOS project
Install-Package BarcodeScanner.XF
- Manifest.xml
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.CAMERA" />- Init the library in MainActivity.cs
base.OnCreate(savedInstanceState);
...
GoogleVisionBarCodeScanner.Droid.RendererInitializer.Init();
...
global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
LoadApplication(new App());
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
- Edit Info.plist, add camera rights
<key>NSCameraUsageDescription</key>
<string>Require to use camera</string>
-
Create an project in Google Firebase Console, download GoogleService-Info.plist https://console.firebase.google.com/
-
Put GoogleService-Info.plist into Resources folder of iOS project, set Build Action as BundleResource
-
Init project and firebase on AppDelegate.cs
global::Xamarin.Forms.Forms.Init();
LoadApplication(new App());
....
GoogleVisionBarCodeScanner.iOS.Initializer.Init();
Firebase.Core.App.Configure();
....
return base.FinishedLaunching(app, options);
GoogleVisionBarCodeScanner.Methods.SetSupportBarcodeFormat(BarcodeFormats.QRCode);2. It is all about the camera view, use it on the page.xaml. For now, it will spend your whole width of the screen and the height will be equal to width.
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:gv="clr-namespace:GoogleVisionBarCodeScanner;assembly=GoogleVisionBarCodeScanner"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="SampleApp.Page1">
<ContentPage.Content>
<ScrollView HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
<!--VirbationOnDetected: Indicate the device will vibrate or not when detected barcode, default is True
DefaultTorchOn: Indicate the torch will on or not when the view appear, default is False
AutoStartScanning : Indicate whether the device will start scanning after it is opened, default is True-->
<gv:CameraView HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" OnDetected="CameraView_OnDetected" Grid.Row="1"
DefaultTorchOn="True" VibrationOnDetected="False" AutoStartScanning="True"/>
</ScrollView>
</ContentPage.Content>
</ContentPage>3. Once barcode detected, "OnDetected" event will be triggered, do the stuff you want with the barcode, it will contains type and display value
private async void CameraView_OnDetected(object sender, GoogleVisionBarCodeScanner.OnDetectedEventArg e)
{
List<GoogleVisionBarCodeScanner.BarcodeResult> obj = e.BarcodeResults;
string result = string.Empty;
for(int i = 0; i < obj.Count; i++)
{
result += $"{i + 1}. Type : {obj[i].BarcodeType}, Value : {obj[i].DisplayValue}{Environment.NewLine}";
}
Device.BeginInvokeOnMainThread(async() =>
{
await DisplayAlert("Result", result, "OK");
//If you want to stop scanning, you can close the scanning page
await Navigation.PopModalAsync();
//if you want to keep scanning the next barcode, do not close the scanning page and call below function
//GoogleVisionBarCodeScanner.Methods.SetIsScanning(true);
});
} GoogleVisionBarCodeScanner.Methods.ToggleFlashlight();bool allowed = await GoogleVisionBarCodeScanner.Methods.AskForRequiredPermission(); GoogleVisionBarCodeScanner.Methods.IsTorchOn();//Old method, you can use the new one.
//GoogleVisionBarCodeScanner.Methods.Reset();
GoogleVisionBarCodeScanner.Methods.SetIsScanning(true);//Used MediaPlugin in sample for example
var file = await CrossMedia.Current.PickPhotoAsync();
Stream stream = file.GetStream();
byte[] bytes = new byte[stream.Length];
stream.Read(bytes, 0, bytes.Length);
stream.Seek(0, SeekOrigin.Begin);List<GoogleVisionBarCodeScanner.BarcodeResult> obj = await GoogleVisionBarCodeScanner.Methods.ScanFromImage(bytes);