Question

当我同时设置多个AlarmManager时，它只会触发第一个。

有一个MessageReceiver类，它扩展了BroadcastReceiver。当AlarmManager将触发MessageReceiver时（将执行onReceive（）方法）。在MainActivity中，我创建PendingIntent并设置AlarmManager。

MessageReceiver.java

public class MessageReceiver extends BroadcastReceiver {
@Override
    public void onReceive(Context context, Intent intent) {
        Log.d("Msg","triggered");
        //Do some work
    }
 }

MainActivity.java

AlarmManager msgAlarmManager = (AlarmManager)  getSystemService(Context.ALARM_SERVICE);
Intent msgIntent = new Intent(MainActivity.this,MessageReceiver.class);


PendingIntent msgPending = PendingIntent.getBroadcast(context,
    ++requestCode,
    msgIntent,
    PendingIntent.FLAG_ONE_SHOT);//requestCode is a global variable


msgAlarmManager.setExact(
        AlarmManager.RTC_WAKEUP,
        calender.getTimeInMillis(),
        msgPending); //calender is a Calender Object

MainActivity.java中的这段代码将在我的应用程序的单个运行时中多次执行。

我希望每个警报都被触发，即使它们应该同时被触发。但就我而言，唯一的第一个是触发，另一个不是。如何确保所有AlarmManager都在触发？

Answer 1

我以前这样卖过这个问题：

private void createReminder(Activity activity, Notification notification, MyModelClass model) {
    final int min = 1;
    final int max = 9999;
    final int random = new Random().nextInt((max - min) + 1) + min;
    Intent notificationIntent = new Intent(activity, AlarmReceiver.class);
    notificationIntent.putExtra(AlarmReceiver.NOTIFICATION, notification);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(activity, random, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    long delay = model.dateAndTime.getTime() - Calendar.getInstance().getTimeInMillis();
    long futureInMillis = SystemClock.elapsedRealtime() + delay;
    AlarmManager alarmManager = (AlarmManager) activity.getSystemService(Context.ALARM_SERVICE);
    if (alarmManager != null && model.isAlarmOn) {
        alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, futureInMillis, pendingIntent);
    }
}

private Notification getNotification(Activity activity, MyModelClass model) {
    PendingIntent newEntryActivityPendingIntent = PendingIntent.getActivity(activity, 1, new Intent(activity, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(activity, Common.CHANNEL_ID)
            .setContentTitle("Content title")
            .setContentText("ContentText")
            .setTicker("Hey Come on !")
            .setSmallIcon(R.drawable.ic_launcher_background)
            .setDefaults(Notification.DEFAULT_SOUND)
            .setAutoCancel(true)
            .setContentIntent(newEntryActivityPendingIntent);
    return builder.build();
}

我的接收者是这样；

   public class AlarmReceiver extends BroadcastReceiver {
    public static final String NOTIFICATION = "notification";

    @Override
    public void onReceive(Context context, Intent intent) {
        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = intent.getParcelableExtra(NOTIFICATION);
        notificationManager.notify(1, notification);
    }

}

不要忘记为sdk> 26添加频道ID

public class MyApplication extends MultiDexApplication {

public static final String CHANNEL_ID = "reminderNotificationChannel"
     private void createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel serviceChannel = new NotificationChannel(
                    CHANNEL_ID,
                    "Reminder Notification Channel",
                    NotificationManager.IMPORTANCE_DEFAULT
            );
            NotificationManager manager = getSystemService(NotificationManager.class);
            if (manager != null) {
                manager.createNotificationChannel(serviceChannel);
            }

        }
    }
}

您知道，随机是每个警报的更改请求代码。这样，我们得到了所有不同的警报。

注意：请将MyApplication类添加到清单文件中！

快乐代码！

Answer 2

仅使用唯一值作为请求代码有助于解决问题。因此，更改将仅在PendingIntent中进行，而更新的PendingIntent将如下所示：

Random random = new Random();
PendingIntent msgPending = PendingIntent.getBroadcast(context,
random.nextInt(10000),
msgIntent,
PendingIntent.FLAG_ONE_SHOT);

现在将触发多个警报。

多个AlarmManager触发一次不触发

2 个答案: