服务启动后而非设定时间触发警报

Question

I'm trying to set a trigger for 5 AM every morning to get the phone ready for a USER_PRESENT broadcast, but the trigger goes off as soon as the service is started. The service (PAService) is turned off and on by a switch on the main activity using stopService and startService . This code works fine in the emulator but not an actual Android phone.

public class PAService extends Service {

static boolean is_ready_to_speak = false;
PendingIntent pendingIntent;

public PAService() {

}

public class ScreenReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if(is_ready_to_speak)
        {
            PASpeak paspeak = new PASpeak();
            paspeak.sayit(getApplicationContext(),"You're using your phone for the first time this morning");
           is_ready_to_speak = false;
        }
    }
}


public static class AlarmReceiver extends BroadcastReceiver {

    public AlarmReceiver()
    {
        Log.d("AlarmReceiver func called","alarm receiver func called");
    }
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("RECEIVED BROADCAST", "Sometype of ALARM Broadcast received");
        PASpeak paspeak = new PASpeak();
        paspeak.sayit(context.getApplicationContext(),"ALARM ALARM ALARM");
        is_ready_to_speak = true;
    }

}



@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
    BroadcastReceiver mReceiver = new ScreenReceiver();
    registerReceiver(mReceiver, filter);

    PASpeak paspeak = new PASpeak();
    paspeak.sayit(getApplicationContext(),"process has started");

    Intent alarmIntent = new Intent(PAService.this, AlarmReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(PAService.this, 1, alarmIntent, 0);

    // Set the alarm to start at 5:00 AM
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, 5);
    calendar.set(Calendar.MINUTE, 0);
    calendar.set(Calendar.SECOND, 0);

    AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

    manager.setRepeating(AlarmManager.RTC_WAKEUP,
            calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, // for repeating
            // in every 24
            // hours
            pendingIntent);

    return Service.START_STICKY;
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}

}

Answer 1

manager.setRepeating(AlarmManager.RTC_WAKEUP,
            calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, // for repeating
            // in every 24
            // hours
            pendingIntent);

The 2nd parameter , trigger time triggers the alarm immediately if calendar.getTimeInMillis() is in the past. So what's happening is you are opening the app maybe at 7PM. You expect that the alarm goes off 5AM next morning, but your calendar.getTimeInMillis() would have 5AM the same day morning. So you need to add a check for this:

Calendar calendar = Calendar.getInstance();
// calendar.setTimeInMillis(System.currentTimeMillis()); // YOU DON'T NEED THIS LINE
calendar.set(Calendar.HOUR_OF_DAY, 5);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);

Calendar current = Calendar.getInstance();

int curTime = current.getTimeInMillis();
int alarmTime = calendar.getTimeInMillis();

if (alarmTime >= curTime){
   manager.setRepeating(AlarmManager.RTC_WAKEUP,
        alarmTime, AlarmManager.INTERVAL_DAY, // for repeating
        // in every 24
        // hours
        pendingIntent);
}else{
   calendar.add(Calendar.DAY_OF_MONTH, 1);
   int alarmTime = calendar.getTimeInMillis();
   manager.setRepeating(AlarmManager.RTC_WAKEUP,
        alarmTime, AlarmManager.INTERVAL_DAY, // for repeating
        // in every 24
        // hours
        pendingIntent);
}