Question

我试图设置一个警报，将一个意图发送给广播接收器。接收器应该在logcat中打印一行，说明它已经工作。但是我没有得到接收器正在接收任何东西的迹象。我已经检查了所有我能想到的东西。因为我不知所措，有人可以给我一些指导吗？

警报方法

public void scheduleNextUpdate()
      {

        Intent intent = new Intent(MainActivity.this,AlarmReceiver.class);
        PendingIntent pendingIntent =
            PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);


        long currentTimeMillis = System.currentTimeMillis();
        long nextUpdateTimeMillis = currentTimeMillis * DateUtils.MINUTE_IN_MILLIS;
        Time nextUpdateTime = new Time();
        nextUpdateTime.set(nextUpdateTimeMillis);

        if (nextUpdateTime.hour < 8 || nextUpdateTime.hour >= 22)
        {
          nextUpdateTime.hour = 8;
          nextUpdateTime.minute = 0;
          nextUpdateTime.second = 0;
          nextUpdateTimeMillis = nextUpdateTime.toMillis(false) + DateUtils.DAY_IN_MILLIS;
        }
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC, nextUpdateTimeMillis, pendingIntent);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, nextUpdateTimeMillis,nextUpdateTimeMillis,pendingIntent);

        boolean alarmUp = (PendingIntent.getBroadcast(this, 0, 
                new Intent(MainActivity.this,AlarmReceiver.class), 
                PendingIntent.FLAG_NO_CREATE) != null);

        if (alarmUp)
        {
            Log.d("myTag", "Alarm is already active");
        }
}

ReceiverClass

public class AlarmReceiver extends BroadcastReceiver {
    @Override
     public void onReceive(Context context, Intent intent) {  
         System.out.println("Alarm Received");
    intent = new Intent(context, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getService(context, 0, intent, 0);
     System.out.println("Alarm Received");
}

清单

<receiver android:name=".AlarmReceiver"></receiver>

Answer 1

这个数学似乎错了。我相信你正试图设置一个几代人不会发出的警报：

long currentTimeMillis = System.currentTimeMillis();
long nextUpdateTimeMillis = currentTimeMillis * DateUtils.MINUTE_IN_MILLIS;

也许你打算在一分钟内报警：

long nextUpdateTimeMillis = currentTimeMillis + DateUtils.MINUTE_IN_MILLIS;

无论如何首先使用：

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
                          System.currentTimeMillis() + 10000, 
                          5000,
                          pendingIntent);

要确认您的设置是否正确，如果是，则需要重新计算nextUpdateTimeMillis。

Android Alarm Manager和BroadcastReceiver

1 个答案: