xmln:tools的作用

最新推荐文章于 2024-10-23 16:37:52 发布

最新推荐文章于 2024-10-23 16:37:52 发布 · 217 阅读

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#移动开发

本文解释了XML命名空间在Android开发中的重要性。它定义了文档的XML命名空间，确保诸如<RelativeLayout>等标签能被解析器正确识别。通过xmlns属性声明默认使用的XML元素，并引入额外的命名空间如tools，用于引用特定的元素和属性。

It defines the XML namespace of the document. You should put it, otherwise tags like<RelativeLayout>could be not recognied by the parser.

Namespaces are a way for XML documents to include tags from various vendors. By usingxmlnsattribute you declare, that, by default, you're using XML elements defined here:http://schemas.android.com/apk/res/android(note that this link is broken -this discussionexplains why).

You also declare additional namespace,tools, which is not your default namespace, thus when referencing elements or attributes defined there, you must addtoolsprefix, on example: