Initialization code for ZXing

MainActivity.cs

[Activity(Label = "ZXingSample", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
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);
    
    // Add this...
    ZXing.Net.Mobile.Forms.Android.Platform.Init();
    
    
    global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
    LoadApplication(new App());
  }

  // ... And this
  public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
  {
    global::ZXing.Net.Mobile.Android.PermissionsHandler.OnRequestPermissionsResult(requestCode, permissions, grantResults);
  }
}