android - 检查 AlarmManager 是否存在总是返回 false

Question

我想在 AlarmManager 的帮助下显示每日通知。

它一直工作正常，直到我尝试使其在重新启动后保持不变

我按如下方式创建警报:

if (switch_notif.isChecked()){ //in my activity's code
    NotificationReceiver.scheduleAlarms(getApplicationContext()); //allow the notification

} else {
    NotificationReceiver.stopNotif(getApplicationContext()); //disable them
}

这是我的广播接收器:

public class NotificationReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {

        //Log.d("NotificationReceiver", "onReceive");
        this.sendNotif(context);

        //trying to see if there is already an alarm in place (for reboot)
        boolean alarmUp = (PendingIntent.getBroadcast(context, 100,
                new Intent(),
                PendingIntent.FLAG_NO_CREATE) != null);
        Log.d("NotificationReceiver", alarmUp? "true":"false" ); //always return false

        if (alarmUp)
        {
            //Log.d("NotificationReceiver", "Alarm is already active");
        }
        else { //if no alarm, schedule one
            //Log.d("NotificationReceiver", "Alarm is not active");
            this.scheduleAlarms(context); 

        }
    }

    public static void scheduleAlarms(Context context) {

        //Log.d("NotificationReceiver", "scheduleAlarms");
        Calendar alarmStartTime = Calendar.getInstance();
        Calendar now = Calendar.getInstance();
        alarmStartTime.set(Calendar.HOUR_OF_DAY, 13);
        alarmStartTime.set(Calendar.MINUTE, 31);
        alarmStartTime.set(Calendar.SECOND, 30);
        /*if (now.after(alarmStartTime)) { // not needed when using 1min repeat for testing
            Log.d("Alarm","Added a day");
            alarmStartTime.add(Calendar.DATE, 1);
        }*/

        Intent intent = new Intent(context, NotificationReceiver.class);

        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(context.ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,alarmStartTime.getTimeInMillis(),60000 ,pendingIntent); // set to 1minute for testing purpose

    }

    public static void sendNotif(Context context){ //fire the notification

        //Log.d("NotificationReceiver", "sendNotif");
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(
                Context.NOTIFICATION_SERVICE);

        Intent intent1 = new Intent(context, Notification.class);
        intent1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

        PendingIntent pendingIntent = PendingIntent.getActivity(
                context, 100, intent1, PendingIntent.FLAG_UPDATE_CURRENT);

        Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                .setContentIntent(pendingIntent)
                .setSmallIcon(R.drawable.ic_notif)
                .setContentTitle("Rappel MyCardioPad")
                .setContentText("Vous avez une séance d'éffort aujourd'hui")
                .setSound(soundUri)
                .setAutoCancel(true);

        notificationManager.notify(100, builder.build());

    }

    public static void stopNotif(Context context){ //Allow to turn off the alarm/notification

        //Log.d("NotificationReceiver", "stopNotif");
        Intent intent = new Intent(context, NotificationReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(context.ALARM_SERVICE);
        alarmManager.cancel(pendingIntent);
        pendingIntent.cancel();
    }
}

编辑: 这是我关闭和打开闹钟时的日志:

07-20 14:22:58.637 mycardiopad D/NotificationReceiver: scheduleAlarms
07-20 14:22:59.856 mycardiopad D/NotificationReceiver: onReceive
07-20 14:22:59.856 mycardiopad D/NotificationReceiver: sendNotif
07-20 14:22:59.863 mycardiopad D/NotificationReceiver: false
07-20 14:22:59.863 mycardiopad D/NotificationReceiver: Alarm is not active
07-20 14:22:59.863 mycardiopad D/NotificationReceiver: scheduleAlarms
07-20 14:22:59.908 mycardiopad D/NotificationReceiver: onReceive
07-20 14:22:59.908 mycardiopad D/NotificationReceiver: sendNotif
07-20 14:22:59.912 mycardiopad D/NotificationReceiver: false
07-20 14:22:59.912 mycardiopad D/NotificationReceiver: Alarm is not active
07-20 14:22:59.912 mycardiopad D/NotificationReceiver: scheduleAlarms
07-20 14:23:00.509 mycardiopad D/NotificationReceiver: onReceive
07-20 14:23:00.509 mycardiopad D/NotificationReceiver: sendNotif
07-20 14:23:00.520 mycardiopad D/NotificationReceiver: false
07-20 14:23:00.520 mycardiopad D/NotificationReceiver: Alarm is not active

Answer 1

也许，alarmUp 始终为 false，因为您使用不同的Intent 来比较它们

检查它们是否存在:

boolean alarmUp = (PendingIntent.getBroadcast(context, 100, new Intent(), PendingIntent.FLAG_NO_CREATE) != null);

创建闹钟:

Intent intent1 = new Intent(context, Notification.class);
intent1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 100, intent, PendingIntent.FLAG_UPDATE_CURRENT);

正如您所看到的，两个语句中的 Intent 使用是不同的。 尝试检查如下:

Intent tempIntent = new Intent(context, Notification.class);
tempIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
boolean alarmUp = (PendingIntent.getBroadcast(context, 100, tempIntent, PendingIntent.FLAG_NO_CREATE) != null);

顺便说一句

所有警报都会在重新启动期间被销毁...因此，您应该注册 BroadcastReceiver 以接收 BOOT_COMPLETED 事件。这样，当您收到 BOOT_COMPLETED 事件时，您就知道您的设备已重新启动并且没有警报处于 Activity 状态...然后，您可以再次创建它们。