zxing条码扫描片段

Question

我对移动开发非常陌生，我正在尝试使用 Xamarin(visual studio) 制作一个 android 应用程序。我正在尝试将 zxing 条码扫描仪集成到我的应用程序中，并且我发现了许多将其集成到应用程序中的示例，但它们都在使用 Activity。我想使用片段而不是活动。我试图让我的片段和扫描屏幕出现，但它没有扫描任何东西。有人可以指出正确的方向。谢谢。

更新文件
这是我的 Fragment2.cs：

public class Fragment2 : Fragment
{
    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
       var view = inflater.Inflate(Resource.Layout.MySettingsView, container, false);



        ImageButton scanBtn = view.FindViewById<ImageButton>(Resource.Id.btnScan);
        TextView results = view.FindViewById<TextView>(Resource.Id.results);

        scanBtn.Click += async (sender, e) =>
        {
            MobileBarcodeScanner.Initialize(Activity.Application);
            var scanner = new MobileBarcodeScanner();
            var result = await scanner.Scan();

            if (result != null)
            {
                return;
            }

            Console.WriteLine($"Scanned Barcode: {result}");
            Activity.RunOnUiThread(() =>
            {
                results.Text = result.Text;
            });
        };

        return view;
    }
}

Answer 1

我正在改变一些事情：

public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    // you don't need this you can safely remove it.
    //var ignored = base.OnCreateView (inflater, container, savedInstanceState);

    // changed this line to properly inflate the fragment's layout 
    var view = inflater.Inflate (Resource.Layout.fragment2_layout, container, false);

    ImageButton scanBtn = view.FindViewById<ImageButton> (Resource.Id. btnScan);
    TextView results = view.FindViewById<TextView> (Resource.Id. Results);

    scanBtn.Click += async (sender, e) => {

        // you don not create a new instance of the Android Application 
       // but get the one already created. From an activity you 
      // just call `Application` but from inside a fragment you need to get 
      // the fragment's activity then get the Application.

        MobileBarcodeScanner.Initialize (Activity.Application);

        var scanner = new MobileBarcodeScanner ();

        var result = await scanner.Scan ();

        // The if was inverted.
        if (result == null)
        {
            return;
        }

        Console.WriteLine ($"Scanned Barcode: {result}");

        // Using this you are sure it will run in the UI thread
        // as you will be updating an UI element.
        Activity.RunOnUiThread (() => {
            results.Text = result.Text;
        });

    };

    return view;
}

希望这会有所帮助！

Answer 2

@apineda 的代码运行良好，但我遇到了自动对焦问题。经过研究，我找到了解决该问题的方法。这是我的扫描片段。

public class Fragment2 : Fragment
{
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
   var view = inflater.Inflate(Resource.Layout.MySettingsView, container, false);



    ImageButton scanBtn = view.FindViewById<ImageButton>(Resource.Id.btnScan);
    TextView results = view.FindViewById<TextView>(Resource.Id.results);

    scanBtn.Click += async (sender, e) =>
    {
        MobileBarcodeScanner.Initialize(Activity.Application);
        var scanner = new MobileBarcodeScanner();
        var result = (ZXing.Result)null;

        result = await scanner.Scan();

        if (result == null)
        {
            scanner.AutoFocus();
            return;
        }

        Console.WriteLine($"Scanned Barcode: {result}");
        Activity.RunOnUiThread(() =>
        {
            results.Text = result.Text;
        });
    };

    return view;
}
}