NotificationManager.cancel（ID）是不是一个广播接收机内部工作 [英] NotificationManager.cancel(id) is not working inside a broadcast receiver

问题描述

安卓：我试图安装一个包后，从通知栏取消通知。
什么我做的是以下内容：

Android: I am trying to cancel a notification from the notification bar after a package being installed. What I am doing is the following:

 public class MyBroadcastReceiver extends BroadcastReceiver {

                private static final String TAG = "MyBroadcastReceiver";

                @Override
                public void onReceive(Context context, Intent intent) {
                    String action = intent.getAction();
                    if (Intent.ACTION_PACKAGE_ADDED.equals(action)) {
                        Uri data = intent.getData();
                        //some code goes here
                        //get the id of the notification to cancel in some way
                        notificationhelper._completeNotificationManager.cancel(id);     
                        }
                }
            }

其中，

public class notificationhelper {
    public static NotificationManager _completeNotificationManager = null;

    public void complete() {        
        if (_completeNotificationManager == null)
            _completeNotificationManager = (NotificationManager) _context.getSystemService(Context.NOTIFICATION_SERVICE);
            Notification notification = new Notification(
                R.drawable.notification,
                _context.getString(R.string.notification),
                System.currentTimeMillis());
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notification.flags |= Notification.FLAG_NO_CLEAR;
        _completeNotificationManager.notify(TEXT, id, notification);
    }
}

但 notificationhelper._completeNotificationManager.cancel（ID）不起作用。我试图用 notificationhelper._completeNotificationManager.cancelAll（）; 和它的作品。我做错了吗？

But the notificationhelper._completeNotificationManager.cancel(id) does not work. I tried to use notificationhelper._completeNotificationManager.cancelAll(); and it works. What I am doing wrong?

推荐答案

在我的经验，则无法取消与特定ID的所有通知，无论标签。

In my experience, you can't cancel all notifications with a particular ID, regardless of tag.

也就是说，如果你创建了这样两则通知：

That is, if you create two notifications like so:

notificationManager.notify(TAG_ONE, SAME_ID, notification_one);
notificationManager.notify(TAG_TWO, SAME_ID, notification_two);

然后， notificationManager.cancel（SAME_ID）不会取消其中任何一个！我怀疑这是因为标签字段，如果未指定的通知（）和取消（），默认为空，你必须明确取消。

Then, notificationManager.cancel(SAME_ID) won't cancel either of them! I suspect that this is because the "tag" field, if unspecified in notify() and cancel(), defaults to null, which you have to cancel explicitly.

所以，取消这两个通知，你必须调用：

So, to cancel these two notifications, you have to call:

notificationManager.cancel(TAG_ONE, SAME_ID);
notificationManager.cancel(TAG_TWO, SAME_ID);

在你的情况，你提供TEXT的标签，但使用的ID，默认使用标签= NULL取消而已。

In your case, you're supplying "TEXT" as the tag but cancelling just using the id, which defaults to using tag=null.

所以，要么不提供文字作为标记：

So, either don't provide TEXT as your tag:

_completeNotificationManager.notify(id, notification);

或者，如果你需要单独通知，不希望他们揍对方，跟踪有源标签：

Or, if you need separate notifications and don't want them to clobber each other, keep track of the active tags:

_completeNotificationManager.notify(TEXT, id, notification);
collectionOfActiveTags.add(TEXT);

...

for (String activeTag : collectionOfActiveTags)    
    notificationhelper._completeNotificationManager.cancel(activeTag, id);

我希望你正在试图做什么的支持，因为它似乎是应该的。

I wish that what you're trying to do was supported, as it seems that it should be.

这篇关于NotificationManager.cancel（ID）是不是一个广播接收机内部工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！