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。通过声明默认使用的XML元素，可以避免标签冲突，并确保应用能正确引用特定于Android的元素。
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 using xmlns attribute 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 discussion explains why).
You also declare additional namespace, tools, which is not your default namespace, thus when referencing elements or attributes defined there, you must add tools prefix, on example:
tools:context=".SomeActivity"
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