Question

我有一个AlarmManager在BroadcastReceiver子类中设置，使用Service子类作为上下文。 AlarmManager没有被解雇。我知道AlarmManager正在设置正确的毫秒数。

为什么AlarmManager没有触发的任何想法？

public class Alarm extends BroadcastReceiver
    {
        public static final String TAG = "Alarm";
        public MediaPlayer mediaPlayer;
        public AlarmManager alarmManager;

        @Override
        public void onReceive(Context context, Intent intent)
        {
            Log.d(TAG, "Alarm set off onReceive");

            PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
            PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
            wl.acquire();

            //Put to code to execute upon alarm here

            //Check to see if the sounds are playing, if they are stop them.
            if (mediaPlayer.isPlaying()){
                //Call play will simulate the user tapping the play button which will stop the sounds.
                mediaPlayer.stop();
                mediaPlayer.release();
            }

            wl.release();
        }

        public void setAlarm(Context context, long milliSeconds, MediaPlayer mp)
        {
            //Set the mediaPlayer member var
            mediaPlayer = mp;

            //Figure out the time to stop the timer in milliseconds
            long currentTime = System.currentTimeMillis();
            long timeToSetAlarmTo = currentTime+milliSeconds;
            Log.d(TAG, "Current Time = " + currentTime + "Time to add = " + milliSeconds + "Time to set timer to = " + timeToSetAlarmTo);

            //Create the intent
            Intent i = new Intent("SmartlifeSoftware.START_ALARM");
            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, i, 0);

            //Set the alarm
            alarmManager=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
            alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, timeToSetAlarmTo, pendingIntent);

        }

        public void CancelAlarm(Context context)
        {
            Intent intent = new Intent("SmartlifeSoftware.START_ALARM");
            PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
            alarmManager.cancel(sender);
        }
    }

以下是应用程序标记

下的清单代码

    <receiver android:name="services.Alarm" android:exported="true">
        <intent-filter>
            <action android:name="SmartlifeSoftware.START_ALARM">
            </action>
        </intent-filter>
    </receiver>`

Answer 1

我解决了这个问题。在alarmManager.set方法中，我将int type参数从AlarmManager.ELAPSED_REALTIME_WAKEUP更改为AlarmManager.RTC_WAKEUP。 RTC_WAKEUP指定开火时间。

来自文档：

RTC_WAKEUP - 唤醒设备以在指定时间触发待处理的意图。

ELAPSED_REALTIME_WAKEUP - SystemClock.elapsedRealtime（）中的闹钟时间（启动后的时间，包括睡眠时间），它会在设备熄灭时唤醒设备。

Answer 2

由于您的triggerAtMilis参数错误，您的闹钟不会因AlarmManager.ELAPSED_REALTIME_WAKEUP而触发。你应该改变：

long currentTime = System.currentTimeMillis();
long timeToSetAlarmTo = currentTime+milliSeconds;

到

long currentTime = SystemClock.elapsedRealtime()
long timeToSetAlarmTo = currentTime+milliSeconds;

没有触发BroadcastReceiver的AlarmManager

2 个答案: