屏幕锁定时Xamarin Android振动不起作用

Question

当屏幕锁定时，我一直在尝试使我的Android手机振动，以下代码是接收SMS消息并振动。我已经看到屏幕上锁定的多个示例可以振动，但我永远无法正常工作。我是移动应用程序开发的新手。下面的代码在屏幕锁定时适合三星Galaxy Note 9。我在清单中设置了振动和接收SMS的权限。但是当屏幕锁定时，它只是失败。有人可以查看我的代码并在锁定屏幕时振动。

我非常感谢。请发布完整的示例，我可以再次使用我是移动开发的新手。

[BroadcastReceiver(Enabled = true, Label = "SMS Receiver", Exported = true)]
[IntentFilter(new string[] { "android.provider.Telephony.SMS_RECEIVED" }, Priority = (int)IntentFilterPriority.HighPriority)]
public class MySMSReciver : BroadcastReceiver
{ 
    public static readonly String INTENT_ACTION = "android.provider.Telephony.SMS_RECEIVED";
    protected string message, address = "";
    public override void OnReceive(Context context, Intent intent)
    {
        InvokeAbortBroadcast();
        try
        {
            if (intent.Action != INTENT_ACTION) return;

            var bundle = intent.Extras;

            if (bundle == null)
            {
                return;
            }
            var pdus = bundle.Get("pdus").ToArray<Java.Lang.Object>();
            var msgs = new SmsMessage[pdus.Length];
            var sb = new StringBuilder();
            String sender = null;
            String messageBody = null;             
            for (int i = 0; i < msgs.Length; i++)
            {

                msgs[i] = SmsMessage.CreateFromPdu((byte[])pdus[i]);

                messageBody = msgs[i].MessageBody;

                if (sender == null)
                {
                    sender = msgs[i].OriginatingAddress;

                }

                sb.Append(string.Format("SMS From: {0}{1}Body: {2}{1}", msgs[i].OriginatingAddress, System.Environment.NewLine, messageBody));

            }

            if (sender != null)
            {
                Toast.MakeText(context, "your SMS Message:" +  sb.ToString(), ToastLength.Long).Show();
                //works well but fails when screen is locked.
                var duration = TimeSpan.FromSeconds(5);
                Xamarin.Essentials.Vibration.Vibrate(duration);
            }
         else
           {
             ClearAbortBroadcast();
            }
        }
        catch (Exception ex)
        {
             Toast.MakeText(context, "Error :" +ex.Message, ToastLength.Long).Show();
        }

     }    
}

Answer 1

您可以尝试使用前景服务，请参阅： https://learn.microsoft.com/en-us/xamarin/android/app-fundamentals/services/services/foreground-services

这是其中的一个示例：https://github.com/xamarin/monodroid-samples/tree/main/ApplicationFundamentals/ServiceSamples/ForegroundServiceDemo< /a>