All applications and all components define the layout of their user interface in an XML file.

所有应用程序和所有组件都在XML文件中定义其用户界面的布局。

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It provides a widget, of course, but also the actions that give access to the Part's functionality, as well as an XML file that describes the layout of those actions in the user interface.

它提供一个窗口构件，当然还提供给予Part功能访问权的操作，以及描述这些操作在用户界面中的布局的XML文件。

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Listing 1. main.xml, the user interface layout file.

清单1 . main . xml，用户界面布局文件。

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