ZXing.Net.Mobile

Getting Started

You can use ZXing.Net.Mobile for Forms in your iOS, Android, Windows Phone (Silverlight) and Windows Universal Forms projects.

Usage

The simplest example of using ZXing.Net.Mobile looks something like this:

buttonScan.Click += (sender, e) => {

    var scanner = new ZXing.Mobile.MobileBarcodeScanner();
    var result = await scanner.Scan();

    if (result != null)
        Console.WriteLine("Scanned Barcode: " + result.Text);
};

NOTE: On Android you must call the platform specific initializer sometime before trying to scan:

// Somewhere in your app, call the initialization code:
MobileBarcodeScanner.Initialize (Application);

Android Versions

The component should work on Android 2.2 or higher. In Xamarin.Android there are 3 places in the project settings relating to Android version. YOU MUST set the Project Options -> Build -> General -> Target Framework to 2.3 or higher. If you still want to use 2.2, you can set the Project Options -> Build -> Android Application -> Minimum Android version to 2.2, but be sure to set the Target Android version in this section to 2.3 or higher.

You must also add a reference to the Component Android Support Library v4 https://components.xamarin.com/view/xamandroidsupportv4-18 from the Component Store.

Android Permissions

The Camera permission should automatically be added to your AndroidManifest.xml for you (it's required for barcode scanning), however the Flashlight permission needs to be manually added if you would like to use Torch API's. You can add it by adding the following assembly level attribute to your app:

ssembly: UsesPermission (Android.Manifest.Permission.Flashlight)]

Custom Overlays

By default, ZXing.Net.Mobile provides a very simple overlay for your barcode scanning interface. This overlay consists of a horizontal red line centered in the scanning 'window' and semi-transparent borders on the top and bottom of the non-scanning area. You also have the opportunity to customize the top and bottom text that appears in this overlay.

If you want to customize the overlay, you must create your own View for each platform. You can customize your overlay like this:

var scanner = new ZXing.Mobile.MobileBarcodeScanner();
scanner.UseCustomOverlay = true;
scanner.CustomOverlay = myCustomOverlayInstance;
var result = await scanner.Scan();
//Handle result

Keep in mind that when using a Custom Overlay, you are responsible for the entire overlay (you cannot mix and match custom elements with the default overlay). The ZxingScanner instance has a CustomOverlay property, however on each platform this property is of a different type:

  • Xamarin.iOS => UIView
  • Xamarin.Android => View
  • Windows Phone => UIElement

All of the platform samples have examples of custom overlays.

Barcode Formats

By default, all barcode formats are monitored while scanning. You can change which formats to check for by passing a ZxingScanningOptions instance into the StartScanning method:

var options = new ZXing.Mobile.MobileBarcodeScanningOptions();
options.PossibleFormats = new List<ZXing.BarcodeFormat>() { 
    ZXing.BarcodeFormat.Ean8, ZXing.BarcodeFormat.Ean13 
};

var scanner = new ZXing.Mobile.MobileBarcodeScanner();
var result = await scanner.Scan(options);
//Handle result

Using the ZXingScanner View / Fragment / Control

On each platform, the ZXing scanner has been implemented as a reusable component (view, fragment, or control), and it is possible to use the reusable component directly without using the MobileBarcodeScanner class at all. On each platform, the instance of the view/fragment/control contains the necessary properties and methods required to control your scanner. By default, the default overlay is automatically used, unless you set the CustomOverlay property as well as the UseCustomOverlay property on the instance of the view/fragment/control. You can use methods such as ToggleTorch() or StopScanning() on the view/fragment/control, however you are responsible for calling StartScanning(...) with a callback and an instance of MobileBarcodeScanningOptions when you are ready for the view's scanning to begin. You are also responsible for stopping scanning if you want to cancel at any point.

The view/fragment/control classes for each platform are:

  • iOS: ZXingScannerView (UIView) - See ZXingScannerViewController.cs View Controller for an example of how to use this view
  • iOS: AVCaptureScannerView (UIView) - This is API equivalent to ZXingScannerView, but uses Apple's AVCaptureSession Metadata engine to scan the barcodes instead of ZXing.Net. See AVCaptureScannerViewController.cs View Controller for an example of how to use this view
  • Android: ZXingScannerFragment (Fragment) - See ZXingActivity.cs Activity for an example of how to use this fragment
  • Windows Phone: ZXingScannerControl (UserControl) - See ScanPage.xaml Page for an example of how to use this Control

Using Apple's AVCaptureSession (iOS7 Built in) Barcode Scanning

In iOS7, Apple added some API's to allow for scanning of barcodes in an AVCaptureSession. The latest version of ZXing.Net.Mobile gives you the option of using this instead of the ZXing scanning engine. You can use the AVCaptureScannerView or the AVCaptureScannerViewController classes directly just the same as you would use their ZXing* equivalents. Or, in your MobileBarcodeScanner, there is now an overload to use the AV Capture Engine:

//Scan(MobileBarcodeScanningOptions options, bool useAVCaptureEngine)
scanner.Scan(options, true);

In the MobileBarcodeScanner, even if you specify to use the AVCaptureSession scanning, it will gracefully degrade to using ZXing if the device doesn't support this (eg: if it's not iOS7 or newer), or if you specify a barcode format in your scanning options which the AVCaptureSession does not support for detection. The AVCaptureSession can only decode the following barcodes:

  • Aztec
  • Code 128
  • Code 39
  • Code 93
  • EAN13
  • EAN8
  • PDF417
  • QR
  • UPC-E

License

Apache ZXing.Net.Mobile Copyright 2012 The Apache Software Foundation This product includes software developed at The Apache Software Foundation (http://www.apache.org/).

ZXing.Net

ZXing.Net is released under the Apache 2.0 license. ZXing.Net can be found here: http://zxingnet.codeplex.com/ A copy of the Apache 2.0 license can be found here: http://www.apache.org/licenses/LICENSE-2.0

ZXing

ZXing is released under the Apache 2.0 license. ZXing can be found here: https://github.com/zxing/zxing A copy of the Apache 2.0 license can be found here: http://www.apache.org/licenses/LICENSE-2.0

System.Drawing

The System.Drawing classes included are from the mono source code which is property of Novell. Copyright notice is intact in source code files.