Question

该如何解决？有什么想法吗？谢谢你的帮助

private var notificationManager: NotificationManager? = null

......

problem Classifier 'NotificationManager' does not have a companion object, and thus must be initialized here

代码行->

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

代码

override fun onChildAdded(ds: DataSnapshot, prevChildKey: String?) {

    Log.i(TAG, " child added")
    if(markers.size == 0) {
        pushIssueMarker(ds)
    }
    builder.setSmallIcon(R.mipmap.ic_launcher);
    builder.setContentTitle("Firebase Push Notification");
    builder.setContentText("Hello this is a test Firebase notification, a new database child has been added");
    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notificationManager?.notify(1, builder.build());
}

Answer 1

您正在用Kotlin进行编码。因此其对象创建与JAVA不同。

更改您的下一行

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

此行

val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager

Answer 2

您无需分成两行，可以轻松地将其初始化为

val mNotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

推送通知Kotlin

2 个答案: