Android 清除状态通知

我很难清除状态栏通知

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);     
}

然后，我试图通过调用

notification.cancel(0);

我已经创建了一个通知实例，我不确定它是否正确

private NotificationManager notification;

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当我尝试取消服务，因此清除状态栏时，应用程序崩溃。

您的通知对象可能为null，这将导致

NullPointerException

我认为您应该使用

NotificationManager

对象来取消通知，使用相同的id（在您的情况下为0）并将其传递给

NotificationManager。取消（Int）

：

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我建议您粘贴stacktrace

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