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java - How to listen for added nodes in the firebase database

问题描述

I know how to read data from the firebase database, in my database structure, there is a child with various nodes written and pushed by users. How can I add a listener that will tell me whenever a new node has been added in the child and trigger a notification. Please note I already have a method for creating a notification. I don't want to know the contents of the child added, I just want to know whenever a new child is added. How would I go about this?

标签： javafirebasefirebase-realtime-database

解决方案

对于此功能，您需要将 Firebase函数与数据库触发器一起使用

您可以在此处查看此功能的示例

基本上它是如何工作的

  • 你写一个函数（打字稿/javascript）
  • 您将该函数部署到 Firebase 函数中由于您在函数中使用了数据库触发器，因此只要在您正在侦听的节点内插入新项目，该函数就会触发
  • 触发器是 onCreate()
  • 您将制作一个通知负载，该负载将发送到您存储在子节点中的用户设备令牌

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