AlarmManager不添加新警报，或不触发接收器

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我目前正在开发一个使用Android的AlarmManager的应用程序。我正在尝试向AlarmManager添加新警报，但是经过数小时尝试各种操作并检查SO上的各种线程之后，我仍然处于困境。我的代码有任何问题吗？

I'm currently developing an application which makes use of Android's AlarmManager. I'm trying to add a new alarm to the AlarmManager, but after several hours of trying various things and checking various threads on SO, I'm still at a brick wall. Are there any problems with my code?

主要活动-saveAlarm（）函数 /** * Saves the current alarm. Adds to the database if it doesn't already exist, or updates if it does. * Also sets alert with AlarmManager. */ public void saveAlarm() { // Create Database instance DbHandler db = new DbHandler(getApplicationContext()); if(alarm.getId() == -1) { // Saving a new alarm db.open(); alarm.setId(db.addAlarm(alarm)); db.close(); } else { db.open(); db.updateAlarm(alarm); db.close(); } // Create the wakeup intent Intent intent = new Intent(this, AlarmReceiver.class); intent.putExtra("alarm_id", alarm.getId()); // Create the Pending Intent PendingIntent sender = PendingIntent.getBroadcast(this, AlarmPlayer.REQUEST_ALARM + alarm.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT); // Debug Calendar now = Calendar.getInstance(); long dTime = alarm.getNextAlarmTime().getTimeInMillis() - now.getTimeInMillis(); Log.d(TAG, "Setting alarm for " + (dTime / 1000) + " seconds time"); // Add to Android Alarm Manager AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, alarm.getNextAlarmTime().getTimeInMillis(), sender); }

我已确认将正确的时间传递给 am .set （请参见上面的调试部分）。

I've verified that the correct time is being passed into am.set (see the debug section above it).

AlarmReceiver.class

/** * This class listens out for broadcasts from AlarmManager * and launches the AlarmPlayer activity accordingly. * @author Michael * */ public class AlarmReceiver extends BroadcastReceiver { @Override public void onReceive(Context c, Intent intent) { Log.d("RSS Alarm", "Waking up alarm"); // Launch the AlarmPlayer activity Intent i = new Intent(c, AlarmPlayer.class); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); c.startActivity(i); } }

我还在AndroidManifest.xml中设置了< receiver android：process =：remote android：name = AlarmReceiver /> 。我不知道是什么原因导致了这个问题，但是仍然在发生。任何帮助将不胜感激，在此先感谢您。

I also have <receiver android:process=":remote" android:name="AlarmReceiver" /> set up in AndroidManifest.xml. I have no idea what's causing this problem, but it's happening nonetheless. Any help would be greatly appreciated, many thanks in advance.

编辑1 将时区更改为UTC似乎无法解决任何问题，无论如何我的日历似乎都默认为UTC。当前代码：

Edit 1 Changing the timezone to UTC doesn't seem to solve anything, my calendar seems to default to UTC regardless. Current code:

// Debug Calendar now = Calendar.getInstance(TimeZone.getTimeZone("UTC")); long dTime = alarm.getNextAlarmTime().getTimeInMillis() - now.getTimeInMillis(); Log.d(TAG, "Setting alarm for " + (dTime / 1000) + " seconds time"); // Add to Android Alarm Manager AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); Log.d(TAG, "Timezone offset is " + TimeZone.getDefault().getRawOffset()); Log.d(TAG, "UTC time is currently " + Calendar.getInstance(TimeZone.getTimeZone("UTC")).getTimeInMillis() / 1000); am.set(AlarmManager.RTC_WAKEUP, (alarm.getNextAlarmTime().getTimeInMillis() - TimeZone.getDefault().getRawOffset()), sender);

推荐答案

是否可能是 AlarmManager.set（AlarmManager.RTC_WAKEUP，...）需要UTC时间吗？如果您设置本地时间并且不适应UTC，则可能会导致问题。简而言之，警报可能已正确添加，但除非您的时区为UTC，否则不会在您期望的时间触发。

Is this possibly a case that AlarmManager.set(AlarmManager.RTC_WAKEUP, ...) needs the time in UTC? This causes problems if you're setting a 'local time' and don't adjust to UTC. In short, the alarm may be being properly added but it doesn't trigger when you expect it unless your time-zone is UTC.

从文档中...

公共静态最终int RTC_WAKEUP，因为：API级别1

public static final int RTC_WAKEUP Since: API Level 1

系统中的警报时间.currentTimeMillis（）（ UTC的挂钟时间），它将在设备关闭时唤醒设备。

Alarm time in System.currentTimeMillis() (wall clock time in UTC), which will wake up the device when it goes off.