Xamarin.Forms扫描二维码

仅限Android端

Xamarin.Forms v5.0.0.2012

1、安装包：

　　ZXing.Net.Mobile.Forms v2.4.1

　　Ideine.ZXing.Net.Mobile v2.4.2

　　

2、Android项目

　　MainActivity.cs添加如下代码：

　　MobileBarcodeScanner.Initialize(Application);

    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(savedInstanceState);

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

            MobileBarcodeScanner.Initialize(Application);

            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);
        }
    }

　　AssemblyInfo.cs文件添加如下代码：

　　[assembly: UsesPermission(Android.Manifest.Permission.Camera)] //相机
　　[assembly: UsesPermission(Android.Manifest.Permission.Flashlight)] //闪光灯　　

　　

3、页面代码：

    <ContentPage.Content>
        <StackLayout>
            <Button x:Name="photo"
                    Text="Photo"
                    Clicked="photo_Clicked"/>
            <Button x:Name="video"
                    Text="Video"
                    Clicked="video_Clicked"/>
            <Button x:Name="scan"
                    Text="Scan"
                    Clicked="scan_Clicked"/>

            <Label x:Name="lab" Text="扫描文本"/>


        </StackLayout>
    </ContentPage.Content>

4、后台代码：

        private async void scan_Clicked(object sender, EventArgs e)
        {
            var scanner = new MobileBarcodeScanner();
            var result = await scanner.Scan();
            if (null != result)
            {
                lab.Text = result.Text;
            }
        }