Powerful barcode scanning library for Xamarin Forms using GoogleVision API.
Works on iOS 10+ and Android (MonoAndroid90 and MonoAndroid10.0)
For Android, it use Xamarin.GooglePlayServices.Vision For iOS, it use GoogleMobileVision under MLKit library
Please feel free to improve my source code.
4.7.0.2 for Xamarin Form 4.7.0.968+
4.6.1 for Xamarin Form 4.6.0.772+, Please notice the assembly name is changed. (See sample xaml)
4.5.0.3 for Xamarin Form 4.5.0.617+
4.2.2.3 for Xamrain Form 4.2 to 4.4
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();
// Temporary work around for bug on Firebase Library
// https://github.com/xamarin/GoogleApisForiOSComponents/issues/368
Firebase.Core.App.Configure();
RemoteConfig.SharedInstance.ConfigSettings = new RemoteConfigSettings();
....
return base.FinishedLaunching(app, options);
- Set Linker Behavior to Link SDK assemblies only
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=BarcodeScanner.XF"
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
RequestedFPS: Affect Android only, leave it if you want a default value (https://developers.google.com/android/reference/com/google/android/gms/vision/CameraSource.Builder.html#public-camerasource.builder-setrequestedfps-float-fps)
-->
<gv:CameraView HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" OnDetected="CameraView_OnDetected" Grid.Row="1"
DefaultTorchOn="True" VibrationOnDetected="False" AutoStartScanning="True" RequestedFPS="30"/>
</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);