Android的报警管理和广播接收器 [英] Android Alarm Manager and BroadcastReceiver

问题描述

我试着去设置闹钟，将意图发送到广播接收机。然后reciever应在logcat中说明它一直打印一行。不过我越来越没有迹象表明reciever正在接收任何东西。我已经检查了所有我能想到的东西。有人可以给我一些指导，我很茫然？

报警方式

 公共无效scheduleNextUpdate（）
      {        意向意图=新意图（MainActivity.this，AlarmReceiver.class）;
        的PendingIntent的PendingIntent =
            PendingIntent.getBroadcast（这一点，0，意向，PendingIntent.FLAG_UPDATE_CURRENT）;
        长的currentTimeMillis = System.currentTimeMillis的（）;
        长nextUpdateTimeMillis =的currentTimeMillis * DateUtils.MINUTE_IN_MILLIS;
        时间nextUpdateTime =新时代（）;
        nextUpdateTime.set（nextUpdateTimeMillis）;        如果（nextUpdateTime.hour＆LT; 8 || nextUpdateTime.hour＆GT; = 22）
        {
          nextUpdateTime.hour = 8;
          nextUpdateTime.minute = 0;
          nextUpdateTime.second = 0;
          nextUpdateTimeMillis = nextUpdateTime.toMillis（假）+ DateUtils.DAY_IN_MILLIS;
        }
        AlarmManager alarmManager =（AlarmManager）getSystemService（ALARM_SERVICE）;
        alarmManager.set（AlarmManager.RTC，nextUpdateTimeMillis，的PendingIntent）;
        alarmManager.setRepeating（AlarmManager.RTC_WAKEUP，nextUpdateTimeMillis，nextUpdateTimeMillis，的PendingIntent）;        布尔alarmUp =（PendingIntent.getBroadcast（这一点，0，
                新意图（MainActivity.this，AlarmReceiver.class）
                PendingIntent.FLAG_NO_CREATE）= NULL）！;        如果（alarmUp）
        {
            Log.d（MyTag的，报警已经被激活）;
        }
}
 

ReceiverClass

 公共类AlarmReceiver扩展广播接收器{
    @覆盖
     公共无效的onReceive（上下文的背景下，意图意图）{
         的System.out.println（报警接收）;
    意图=新意图（背景下，MainActivity.class）;
    的PendingIntent的PendingIntent = PendingIntent.getService（上下文，0，意图，0）;
     的System.out.println（报警接收）;
}
 

清单

 ＆lt;接收机器人：名字=。AlarmReceiver＆GT;＆LT; /接收器＆GT;
 

解决方案

这似乎数学错误。我相信你正在尝试设置闹钟不会熄灭了几代人：

 长的currentTimeMillis = System.currentTimeMillis的（）;
长nextUpdateTimeMillis =的currentTimeMillis * DateUtils.MINUTE_IN_MILLIS;
 

也许你的意思的警报在一分钟内熄灭：

 长nextUpdateTimeMillis = +的currentTimeMillis DateUtils.MINUTE_IN_MILLIS;
 

反正起初用途：

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

要确认您的设置是正确的，如果是这样你需要重新计算你的 nextUpdateTimeMillis 。

Im trying to set an alarm that will send an intent to a broadcast receiver. The reciever should then print a line in the logcat stating it has worked. However I'm getting no indication that the reciever is receiving anything. I've checked all the things I can think of. Can someone give me some guidance as I am at a loss?

Alarm Method

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");
}

The manifest

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

解决方案

This math seems wrong. I believe you are trying to set an alarm that won't go off for a few generations:

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

Maybe you meant for the alarm to go off in one minute:

long nextUpdateTimeMillis = currentTimeMillis + DateUtils.MINUTE_IN_MILLIS;

Anyway first use:

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

To confirm your setup is correct, if so you need to recalculate your nextUpdateTimeMillis.

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