Xamarin Android警报管理器问题

Question

[BroadcastReceiver]
    public class AlarmReceiver : BroadcastReceiver
    {
        public override void OnReceive(Context context, Intent intent)
        {
            Log.Info("AlarmReceiver", "Triggered");
        }

        public static void Start(Context context, long triggerAfterMilis)
        {
            var type = AlarmType.RtcWakeup;
            var alarmManager = (AlarmManager) context.GetSystemService(Context.AlarmService);

            var timerIntent = PendingIntent.GetBroadcast(context, 0, new Intent(context, typeof(AlarmReceiver)), PendingIntentFlags.CancelCurrent);

            alarmManager.Cancel(timerIntent);
            if (Build.VERSION.SdkInt >= BuildVersionCodes.M)
                alarmManager.SetAndAllowWhileIdle(type, triggerAfterMilis, timerIntent);
            else if (Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
                alarmManager.SetExact(type, triggerAfterMilis, timerIntent);
            else
                alarmManager.Set(type, triggerAfterMilis, timerIntent);
            Log.Info("AlarmReceiver", $"Started, tigger after {triggerAfterMilis} miliseconds.");
        }
    }

AlarmReceiver.Start(Activity,(long)TimeSpan.FromMinutes(10).TotalMilliseconds)

Answer 1

您正在设置时间触发警报过去仅使用10分钟的时间跨度，毫秒数需要从一年1970年开始计算。

如果所述触发时间在过去，则立即触发警报。

获取当前时间，并将时间添加到当前时间中。

var TenMinsFromNow = Calendar.GetInstance(Android.Icu.Util.TimeZone.Default).TimeInMillis + TimeSpan.FromMinutes(10).TotalMilliseconds);

 Java.Lang.JavaSystem.CurrentTimeMillis();

 Calendar.GetInstance(Android.Icu.Util.TimeZone.Default).TimeInMillis;