问题描述
我在互联网上看了很多android教程.在这些教程中,他们将 this
上下文用于所有上下文.我知道 this
关键字在Java中的含义,但我无法与Android编程中的 this
关键字等同.例如,在developer.android.com网站上的 AlertDialog.Builder
上,上下文参数只有一个引用,但是我无法了解此 this
就是这里.
I have looked at a lot of android tutorials over the internet. In these tutorials they use the this
context for the context everywhere. I know what this
keyword means in Java, but I can't make equal this, with the this
keyword in Android programming. For example, at AlertDialog.Builder
, on the developer.android.com site, there is only one reference at the parameters to the Context, but I can't learn what this this
means here.
推荐答案
如果您有活动",则可以使用 this
,因为:
if you have an Activity you can use this
because:
-
this
是一个类的当前实例 - 活动是从上下文"类继承的.
因此您可以将当前的活动用作上下文.
so you can use your current Activity as a Context.
在此处查找Acitivty文档
Look here for the Acitivty doc
和此处以获取对的解释这个
这篇关于“此"表示什么?语境?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!