清除状态通知的Andr​​oid [英] Clear a Status Notification Android

问题描述

林有困难的清除状态栏上的通知。

Im having difficulty clearing a status bar Notification.

public void NotificationStatus(){

    Intent intent = new Intent(this, Stimulation.class);   
    NotificationManager notificationManager
        = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    Notification notification = new Notification(
        david.flanagan.android.VenAssist.Activities.R.drawable.notification_icon,
        "VenAssist Stimulation ON", System.currentTimeMillis());
    PendingIntent activity = PendingIntent.getActivity(this, 0, intent, 0);
    notification.flags |= Notification.FLAG_ONGOING_EVENT;
    notification.flags |= Notification.DEFAULT_VIBRATE;
    notification.defaults |= Notification.DEFAULT_SOUND;
    notification.setLatestEventInfo(this, "VenAssist",
        "Stimulation Started", activity);
    notificationManager.notify(0, notification);     
}

我试图再通过调用来清除我的服务的的onDestroy（）函数通知状态

notification.cancel(0);

我创建了通知的一个实例，其中即时通讯不能肯定是正确的。

I have created an instance of the notification, which im not sure is correct.

private NotificationManager notification;

当我尝试取消该服务，因此清除状态栏，应用程序崩溃。

When I try to cancel the service, hence clear the status bar, the app crashes.

推荐答案

您通知对象可能为null，这将导致 NullPointerException异常。

Your notification object may be null, which would cause a NullPointerException.

我觉得你应该使用 NotificationManager 对象取消的通知，使用相同的ID（在你的情况，0），并传递到 NoticationManager.cancel（INT）：

I think you should be using a NotificationManager object to cancel a notification, use the same id (in your case, 0) and pass that to NoticationManager.cancel(Int):

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.cancel(0);

NotificationManager文档

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