c# - 警报未访问 BroadcastReceiver

Question

我有一个时间选择器来设置闹钟

public class TimePickerFragment : DialogFragment, TimePickerDialog.IOnTimeSetListener
{
    public static readonly string TAG = "MyTimePickerFragment";
    Action<DateTime> timeSelectedHandler = delegate { };

    public static TimePickerFragment NewInstance(Action<DateTime> onTimeSelected)
    {
        TimePickerFragment frag = new TimePickerFragment();
        frag.timeSelectedHandler = onTimeSelected;
        return frag;
    }

    public override Dialog OnCreateDialog(Bundle savedInstanceState)
    {
        DateTime currentTime = DateTime.Now;
        //bool is24HourFormat = DateFormat.Is24HourFormat(Activity);
        TimePickerDialog dialog = new TimePickerDialog
            (Activity, this, currentTime.Hour, currentTime.Minute, false);
        return dialog;
    }



    public void OnTimeSet(TimePicker view, int hourOfDay, int minute)
    {
        DateTime currentTime = DateTime.Now;
        DateTime selectedTime = new DateTime(currentTime.Year, currentTime.Month, currentTime.Day, hourOfDay, minute, 0);
        Log.Debug(TAG, selectedTime.Ticks.ToString());

        timeSelectedHandler(selectedTime);
    }
}

这个函数用来设置闹钟

 private void setAlarm(DateTime time)
        {
            Intent intent = new Intent(this, typeof(MyReceiver));
            PendingIntent pendingIntent = PendingIntent.GetBroadcast(this, RQS_1, intent, 0);
            AlarmManager alarmManager = (AlarmManager)GetSystemService(Context.AlarmService);
            alarmManager.Set(AlarmType.RtcWakeup, time.Ticks, pendingIntent);
            string timeSet = time.Ticks.ToString();
            Toast.MakeText(this, timeSet, ToastLength.Short).Show();

        }

即使设置的闹钟等于当前时间，也不会调用 broadcastreceiver。我试过检查time time set和current time的值，即使当前时间到了set time，broadcastreceiver也不生效

广播接收者

[BroadcastReceiver]
    public class MyReceiver : BroadcastReceiver
    {
        public override void OnReceive(Context context, Intent intent)
        {
            Toast.MakeText(context, "Time reached!", ToastLength.Short).Show();
        }
    }
}

我是缺少权限还是其他原因？

更新:感谢 sushihangover 的回答

public class TimePickerFragment : DialogFragment, TimePickerDialog.IOnTimeSetListener
    {
        public static readonly string TAG = "MyTimePickerFragment";
        Action<Calendar> timeSelectedHandler = delegate { };

        public static TimePickerFragment NewInstance(Action<Calendar> onTimeSelected)
        {
            TimePickerFragment frag = new TimePickerFragment();
            frag.timeSelectedHandler = onTimeSelected;
            return frag;
        }

        public override Dialog OnCreateDialog(Bundle savedInstanceState)
        {
            DateTime currentTime = DateTime.Now;
            //bool is24HourFormat = DateFormat.Is24HourFormat(Activity);
            TimePickerDialog dialog = new TimePickerDialog
                (Activity, this, currentTime.Hour, currentTime.Minute, false);
            return dialog;
        }

        public void OnTimeSet(TimePicker view, int hourOfDay, int minute)
        {
            Calendar calNow = Calendar.Instance;
            Calendar calSet = (Calendar)calNow.Clone();
            calSet.Set(CalendarField.HourOfDay, hourOfDay);
            calSet.Set(CalendarField.Minute, minute);

            calSet.Set(CalendarField.Millisecond, 0);

            DateTime currentTime = DateTime.Now;
            DateTime selectedTime = new DateTime(currentTime.Year, currentTime.Month, currentTime.Day, hourOfDay, minute, 0);
            Log.Debug(TAG, selectedTime.Ticks.ToString());

            timeSelectedHandler(calSet);
        }
    }

Answer 1

您正在使用 .Net 的 DateTime 中的刻度，而 Android 的 AlarmManager 基于 Android/Linux Epoch 毫秒:

查看我对这些其他 SO 的回答，了解如何使用 Android 系统时间或 Android 日历:

• https://stackoverflow.com/a/41064490/4984832
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