Xamarin.forms StartForeground运行时无法启动Zxing

如果您正在从Android.App服务运行Start前台 我在启动Zxing（条形码读取）时出错

}

服务中断 意向服务意向=新意向（此，类型为（后台服务））；*“BackgroundService”是正在运行的服务类 Base.StopService（serviceIntent）

使用StopSelf（）方法停止

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结果，什么问题都解决不了。

您好，您的代码的哪一部分调用了这个？你想达到什么目标？您试图解决什么问题？谢谢您的回复。2020/12/22：查询的详细信息已更新。

Error details: Compatible code is not running.
Selective debug execution may or may not be the executable code running in the current thread.
Unhandled Exception:
Java.Lang.NullPointerException: <Timeout exceeded getting exception details>

 void Handle_OnScanResult (ZXing.Result result)
 {
     Device.BeginInvokeOnMainThread (async () =>
     {
         zxing.IsAnalyzing = false;
         await Navigation.PopAsync ();
         await DisplayAlert ("notification", "Read the following value:" + result.Text, "OK");
         zxing.IsAnalyzing = true;
     });
 }

 protected override void OnAppearing ()
 {
     try
     {
         base.OnAppearing ();
         zxing.IsScanning = true;
     }
     catch (Exception ex)
     {

         DisplayAlert ("ExErr",
             $ "{ex.Message}", Msg.Button.Ok);
     }
 }

 protected override void OnDisappearing ()
 {
     zxing.IsScanning = false;
     base.OnDisappearing ();
 }