我如何使用Zxing.net.mobile库读Xamarin.android的2D条形码PDF-417

Question

我正在使用xamarin.android和zxing.net.net.mobile c＃library。

开发Android应用

我想开发一个Android应用来扫描base64字符串中编码的PDF-417中的2D条形码。

这是我第一次使用此库，但仍未找到有关如何使用图书馆的段落的文档。

我在此处遵循了示例https://github.com/redth/zxing.net.mobile和这里

以下是我的活动代码：

using Android.App;
using Android.Widget;
using Android.OS;
using ZXing;
using ZXing.Mobile;
using System;
using System.Collections.Generic;
namespace BarcodeScannerDemo
{
    [Activity(Label = "ID Scanner Demo", MainLauncher = true)]
    public class MainActivity : Activity
    {
        Button buttonScan;
        MobileBarcodeScanner scanner;
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            MobileBarcodeScanner.Initialize(Application);
            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);
            scanner = new MobileBarcodeScanner();
            buttonScan = FindViewById<Button>(Resource.Id.buttonScan);
            buttonScan.Click += ButtonScan_Click;
        }

        private async void ButtonScan_Click(object sender, EventArgs e)
        {
            var scannerOptions = new MobileBarcodeScanningOptions
            {
                PossibleFormats = new List<BarcodeFormat> { BarcodeFormat.PDF_417 },
                TryHarder = true
            };
            var overlay = LayoutInflater.Inflate(Resource.Layout.CustomOverlay, null);
            Button buttonFlash = overlay.FindViewById<Button>(Resource.Id.buttonFlash);
            Button buttonCancel = overlay.FindViewById<Button>(Resource.Id.buttonCancel);
            buttonCancel.Click += (btnCancelSender, btnCancelEventArgs) => scanner.Cancel();
            buttonFlash.Click += (btnFlashSender, btnFlashEventArgs) => scanner.ToggleTorch();
            scanner.UseCustomOverlay = true;
            scanner.CustomOverlay = overlay;
            scanner.AutoFocus();
            HandleResult(await scanner.Scan(this, scannerOptions));
        }
        private void HandleResult(ZXing.Result result)
        {
            var message = "No Barcode!";
            if (result != null)
            {
                message = $"{result.BarcodeFormat}";
            }
            Toast.MakeText(this, message, ToastLength.Long).Show();
        }
    }
}

应用程序编译并在设备上安装，我没有收到运行时错误，但我没有得到扫描结果。扫描仪只是继续重新聚焦。我将条形码格式限制为PDF-417。

我在做什么错？

Answer 1

从bonetoad的响应中得到答案