Android 检测呼叫结束并以xamarin表单生成弹出消息

伙计们，我已经在incomingCallReceiver.droid中创建了一个工作代码，它可以检测通话结束并在中显示消息 但是，我的控制台无法显示弹出窗口，因为使用AlertDialog、DisplayAlert、MessageBox.show似乎都不起作用

所以我想知道是否有办法解决这个问题：-

    public override void OnReceive(Context context, Intent intent)
    {
        try
        {
            if (intent != null && intent.Action.Equals("android.intent.action.NEW_OUTGOING_CALL"))
            {
                //Toast.makeText(context, "Outgoign call", 1000).show();
                String number = intent.GetStringExtra(Intent.ExtraPhoneNumber);
            }
            else
            {
                //get the phone state
                String newPhoneState = intent.HasExtra(TelephonyManager.ExtraState) ? intent.GetStringExtra(TelephonyManager.ExtraState) : null;
                Bundle bundle = intent.Extras;

                if (newPhoneState != null && newPhoneState.Equals(TelephonyManager.ExtraStateRinging))
                {
                    //read the incoming call number
                    String phoneNumber = bundle.GetString(TelephonyManager.ExtraIncomingNumber);
                    //Log.i("PHONE RECEIVER", "Telephone is now ringing " + phoneNumber);

                }
                else if (newPhoneState != null && newPhoneState.Equals(TelephonyManager.ExtraStateIdle))
                {
                    //Once the call ends, phone will become idle
                    //Log.i("PHONE RECEIVER", "Telephone is now idle");

                    Console.WriteLine("call ended");
                    //DisplayAlert("Alert", "CALL RECIEVED", "OK");

                }
                else if (newPhoneState != null && newPhoneState.Equals(TelephonyManager.ExtraStateOffhook))
                {
                    //Once you receive call, phone is busy
                    //Log.i("PHONE RECEIVER", "Telephone is now busy");
                }

            }

        }
        catch (Exception e)
        {
            //Log.i("Telephony receiver", ee.getMessage());
        }

    }

    private void DisplayAlert(string v1, string v2, string v3)
    {
        throw new NotImplementedException();
    }
}

---

你试过在UI线程上做吗？大概是这样的：

var _activityContext = (Activity) context;
Android.App.AlertDialog.Builder dialog = new AlertDialog.Builder(_activityContext);  
AlertDialog alert = dialog.Create();  
alert.SetTitle("Title");  
alert.SetMessage("Simple Alert");  
alert.SetButton("OK", (c, ev) =>  
{  
// Ok button click task  
});  
_activityContext.RunOnUiThread(() => { 

alert.Show(); 
 });

---

谢谢你的回复，但我试过了，它不起作用。是否需要在MainActivity.cs文件的其他位置创建引用？如果state.equalTelephonyManager.ExtraStateIdle{Console.WriteLinecall已结束；`Android.App.AlertDialog.Builder dialog=新建AlertDialog.Buildercontext；AlertDialog alert=dialog.Create；alert.SetTitletle；alert.SetMessageSimple alert；alert.SetButtonOK，c，ev=>{context.RunOnUiThread=>{alert.Show；}；}}}}}`context不包含RunOnUiThread的定义，并且找不到接受context类型的第一个参数的扩展方法RunOnUiThread，因为您需要活动实例，无论如何我已经为您完成了查看