Question

我正在尝试实现一项功能，用户可以设置一个提醒，该提醒将与本地推送通知一起提供。

时间到了，我正在使用AlarmManager进行广播。然后在广播接收器中，我发布一个本地通知，然后启动一个前台服务，该服务会启动活动，以便我可以唤醒设备并打开屏幕。

如果发布通知后我什么也不做（只需返回就不启动前台服务），我可以使设备显示通知没有问题。但是，如果我在发布通知后立即启动服务，则只会有些震动，但是我在任何地方都看不到该通知。甚至来自通知管理器的陌生人都说，尽管没有任何内容，但getActiveNotifications（）发出了1条通知。

接收器：

@Override
public void onReceive(Context context, Intent intent) {
    final String action = intent.getAction();
    if (!action.equals(context.getString(R.string.reminder_action_string))) {
        // fail safe check
        return;
    }

    // create the channel for android 8
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel(
                CHANNEL_ID,
                context.getString(R.string.reminder_notification_channel),
                NotificationManager.IMPORTANCE_HIGH);

        channel.setDescription(context.getString(R.string.reminder_notification_channel_desc));

        final AudioAttributes attributes = new AudioAttributes.Builder()
                .setUsage(AudioAttributes.USAGE_NOTIFICATION)
                .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                .build();
        channel.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION), attributes);

        NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
        notificationManager.createNotificationChannel(channel);
    }

    NotificationCompat.Builder builder = new NotificationCompat.Builder(context, ReceiverReminder.CHANNEL_ID)
            .setChannelId(ReceiverReminder.CHANNEL_ID)
            .setContentTitle(context.getString(R.string.reminder_title))
            .setContentText(intent.getStringExtra(ActivityReminderCreate.TEXT_STRING))
            .setSmallIcon(R.drawable.ic_mic)
            .setStyle(new NotificationCompat.BigTextStyle()
                    .bigText(intent.getStringExtra(ActivityReminderCreate.TEXT_STRING)))
            .setPriority(NotificationCompat.PRIORITY_MAX)
            .setCategory(NotificationCompat.CATEGORY_ALARM)
            .setVisibility(NotificationCompat.VISIBILITY_SECRET)
            .setContentIntent(PendingIntent.getActivity(context, 0, new Intent(context, ActivityReminderList.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK), PendingIntent.FLAG_ONE_SHOT))
            .setAutoCancel(true);

    NotificationManagerCompat manager = NotificationManagerCompat.from(context);
    Notification notification = builder.build();
    final int id = mSecureRandom.nextInt();
    manager.notify(id, notification);

    Intent serviceIntent = new Intent(context, ServiceReminder.class);
    serviceIntent.putExtras(intent);
    serviceIntent.putExtra(KEY_ID, id);
    serviceIntent.putExtra(KEY_NOTIFICATION, notification);
    ContextCompat.startForegroundService(context, serviceIntent);
}

IntentService：

@Override
protected void onHandleIntent(@Nullable Intent intent) {
    // construct notification object
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        // start self in foreground
        NotificationManager manager = getSystemService(NotificationManager.class);
        Log.e(TAG, "notification count: " + manager.getActiveNotifications().length);


        Notification notification = intent.getExtras().getParcelable(ReceiverReminder.KEY_NOTIFICATION);
        int id = intent.getExtras().getInt(ReceiverReminder.KEY_ID);
        startForeground(id, notification);

        Log.e(TAG, "notification count: " + manager.getActiveNotifications().length);
    }

    // start an activity so device can be waken up
    Intent activityIntent = new Intent(ServiceReminder.this, ActivityReminderList.class);
    activityIntent.putExtra(ActivityReminderList.KEY_FROM_SERVICE, true);
    startActivity(activityIntent);
}

Answer 1

我弄清楚了为什么...

我使用了select t1.* from fictional_companies t1 left join processed t2 on t1.ID=t2.ID where t2.id is null，它在完成当前工作时会自行杀死。而对于前台服务，当服务停止时，相关的通知将被取消。

我已改用IntentService，通知将保留在那里。

关于奥利奥本地通知的奇怪问题

1 个答案: