现在做公司任务的时候，经常会要去读Settings的源码，然后发现在xml文件中几乎全是用的preferenceScreen和preferenceCategory标签，很少有用布局和控件的，然后我就自己上网看了很多有关的资料，在此总结下。
首先在res目录下，新建一个命名为xml的文件夹，然后建立一个aaa.xml文件，选择resource标签。
先使用PreferenceCategory，代码如下
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