firebase的addValueEventListener()和addListenerForSingleValueEvent()之间的区别 [英] Difference between addValueEventListener() and addListenerForSingleValueEvent() of firebase
本文介绍了firebase的addValueEventListener()和addListenerForSingleValueEvent()之间的区别的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
正如标题所述，我想知道Firebase的addValueEventListener()和addListenerForSingleValueEvent()之间的区别.
As the title says, I want to know the difference between addValueEventListener() and addListenerForSingleValueEvent() of Firebase.
推荐答案
addValueEventListener()继续侦听查询所附加的查询或数据库引用.
addValueEventListener() keep listening to query or database reference it is attached to.
但是addListenerForSingleValueEvent()立即执行onDataChange方法，并且在执行完该方法一次之后，它将停止监听其附加到的参考位置.
But addListenerForSingleValueEvent() executes onDataChange method immediately and after executing that method once, it stops listening to the reference location it is attached to.
这篇关于firebase的addValueEventListener()和addListenerForSingleValueEvent()之间的区别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！
查看全文
