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http://developer.android.com/intl/zh-cn/guide/topics/ui/custom-components.html#modifying

Custom Components
自定义组件

Android offers a sophisticated and powerful componentized model for building your UI, based on the fundamental layout classes: View and ViewGroup. To start with, the platform includes a variety of prebuilt View and ViewGroup subclasses — called widgets and layouts, respectively — that you can use to construct your UI.

android提供一个复杂和强大的组件化模型来构建你的UI.基于基本的布局类:View 和ViewGroup.首先,这个平台包括一个各种预置的View和ViewGroup子类–称为部件和布局,你能分别用来构建你的UI.