android - 如何取消android中未显示的通知

Question

嗨，我是通知的新手，

我为通知编写了这段代码。

PendingIntent pendingIntent = PendingIntent.getActivity(context, leadidforstatus,
    myIntent, Intent.FLAG_ACTIVITY_NEW_TASK);

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
    .setSmallIcon(R.drawable.noti)
    .setContentTitle("LMS notification")
    .setContentIntent(pendingIntent)
    .setContentText(intent.getStringExtra("messagenotify"))
    .setAutoCancel(true);

i = (int) System.currentTimeMillis();
NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(i, mBuilder.build());

在那里我设置了一个通知列表。其中有些显示，有些不显示。但我想取消所有未显示的通知。

我使用了 mNotificationManager.cancleAll() 但那只是取消显示的通知。提前致谢。

Answer 1

我认为这里的问题是通知在创建后立即启动，而您没有使用 AlarmManager 来安排此通知。

解决方案应该是通过 AlarmManager 安排警报，这将触发上面的通知代码。

这需要 3 个部分:

注册 BroadCastReceiver 并在触发时构建通知:

public class UtilityReceiver  extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
   // .. Here is where you really want to build the notification and notify
   // This will be triggered by the AlarmManager from the Code below
   PendingIntent pendingIntent = PendingIntent.getActivity(context, leadidforstatus, myIntent, Intent.FLAG_ACTIVITY_NEW_TASK);

 NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
               .setSmallIcon(R.drawable.noti)
               .setContentTitle("LMS notification")
               .setContentIntent(pendingIntent)
               .setContentText(intent.getStringExtra("messagenotify"))
               .setAutoCancel(true);

     i = (int) System.currentTimeMillis();
     NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
     mNotificationManager.notify(i, mBuilder.build());

}

使用 AlarmManager 安排一个警报以发送上面的接收器正在监听的广播:

        // Create an Intent to Launch
        Intent notificationIntent = new Intent(context, UtilityReceiver.class);

        // Use a Pending Intent to Launch the Alarm
        PendingIntent notificationPendingIntent = PendingIntent.getBroadcast(context,
                            PendingIntent.FLAG_ONE_SHOT, notificationIntent, Intent.FILL_IN_DATA);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, timeForAlarmInMillis, notificationPendingIntent);

然后，当您遇到不再希望为您的应用程序显示通知的情况时，您可以告诉 AlarmManager 通过重建挂起的 Intent 并使用 AlarmManager 取消它来将它们从其警报队列中删除。

       // Create an Intent to Launch
        Intent notificationIntent = new Intent(context, UtilityReceiver.class);

        // Use a Pending Intent to Launch the Alarm
        PendingIntent notificationPendingIntent = PendingIntent.getBroadcast(context,
                            PendingIntent.FLAG_ONE_SHOT, notificationIntent, Intent.FILL_IN_DATA);
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

        // *********Important this will cancel all the Matching PendingIntents
        alarmManager.cancel(notificationPendingIntent);

祝你好运，并确保在你的 Activity 或 Manifest 中注册你的 Receiver。