Plugin.Scanner 0.0.1-alpha

📱 Plugin.Scanner

EARLY ALPHA

• Planned
  • More options for IBarcodeScanner(Zoom, multiple recognition, enable/disable highlighting, recognition area)
  • Custom data scanner view with overlay etc.
  • Custom overlay for IBarcodeScanner
  • Custom behavior for IBarcodeScanner
  • TextScanner and DocumentScanner

🚀 Mobile cross platform data scanner

This plugin aims to enalbe simple, fast and customizable data scanning(barcodes, text, documents...) using native Android and iOS APIs ML Kit and Vision Kit.

• Platform support iOS 16+ and Android 23+
• Native AI supported detection
• One Shared API cross platforms and frameworks
• Scan barcodes with only 2 lines of code

🚀 Get started

🔧 Platform specific setup

To access the scanner functionality, the following platform-specific setup is required. The application will crash without this setup.

<details> <summary><b>iOS</b></summary>

In the Info.plist file, add the following keys and values:

<key>NSCameraUsageDescription</key>
<string>This app needs access to the camera to scan data.</string>

</details>

<details> <summary><b>Android</b></summary>

The CAMERA permission is required and must be configured in the Android project. In addition:

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />

</details>

⬇️ Installation

Install the NuGet package:

<details> <summary><b>MAUI</b></summary>

dotnet add package Plugin.Scanner.Maui

</details>

<details> <summary><b>Uno</b></summary>

dotnet add package Plugin.Scanner.Uno

</details>

<details> <summary><b>Avalonia</b></summary>

dotnet add package Plugin.Scanner.Avalonia

</details>

Please note: If you encounter this issue, you will need to enable long path support as described here.

⚙️ Setup

<details> <summary><b>MAUI</b></summary>

Enable the plugin in your MauiProgram.cs:

namespace Plugin.Scanner.Maui.Hosting;

public static MauiApp CreateMauiApp()
{
    var builder = MauiApp.CreateBuilder();
    builder.UseScanner();
    return builder.Build();
}

</details>

<details> <summary><b>Uno</b></summary>

Enable the plugin in your App.xaml.cs:

using Plugin.Scanner.Uno.Hosting;

protected override async void OnLaunched(LaunchActivatedEventArgs args)
{
    IApplicationBuilder builder = this.CreateBuilder(args)
        .UseScanner();
    MainWindow = builder.Window;

    Host = await builder.NavigateAsync<Shell>();
}

</details>

<details> <summary><b>Avalonia</b></summary>

Initialize the plugin in your android MainActivity.cs:

protected override void OnCreate(Bundle? savedInstanceState)
{
    base.OnCreate(savedInstanceState);
     
    Hosting.Scanner.Init(this);
}

</details>

🔳 Barcode scanning

<details> <summary><b>Implementation details</b></summary>

• On iOS the scanner uses VisionKits DataScannerViewController
• On Android the scanner uses Googles BarcodeScanner

</details>

<details> <summary><b>MAUI & Uno</b></summary>

Resolve the registered IBarcodeScanner service and scan a single barcode in all supported formats

using Plugin.Scanner.Core.Barcode;
using Plugin.Scanner.Core.Exceptions;

public class MainViewModel
{
    private readonly IBarcodeScanner _barcodeScanner;

    public MainViewModel(IBarcodeScanner barcodeScanner)
    {
        _barcodeScanner = barcodeScanner;
    }

    public async Task ScanBarcode()
    {
        try
        {
            IBarcode barcode = (await _barcodeScanner.ScanAsync(new BarcodeScanOptions() { Formats = BarcodeFormat.All }).ConfigureAwait(false)).RawValue;
        }
        catch(BarcodeScanException exception)
        {
            Debug.WriteLine(exception);
        }
    }
}

</details>

<details> <summary><b>Avalonia</b></summary>

Since dependency injection is not available out of the box a static implementation of the scanner must be used. If you use dependency injection register the IBarcodeScanner serivce with the IServiceCollection.AddBarcodeScanner() extension method. See Maui and Uno examples.

using Plugin.Scanner.Core.Barcode;
using Plugin.Scanner.Core.Exceptions;

public partial class MainViewModel
{
    public async Task ScanBarcode()
    {
        try
        {
            IBarcode barcode = (await BarcodeScanner.Default.ScanAsync(new BarcodeScanOptions() { Formats = BarcodeFormat.All }).ConfigureAwait(false)).RawValue;
        }
        catch (BarcodeScanException exception)
        {
            Debug.WriteLine(exception);
        }
    }
}

</details>

You want to detect only specific format(s)? Create options and set the target formats(s)

var options = new BarcodeScanOptions
{
    Formats = BarcodeFormat.QR | BarcodeFormat.Ean13
};

using var cts = new CancellationTokenSource(TimeSpan.FromMinutes(1));
var barcode = await scanner.ScanAsync(options, cts.Token);
Console.WriteLine($"Scanned: {barcode.RawValue}");