When declaring a Composite for example, the layout automatically defaults to the commonly used GridLayout.

例如在声明一个Composite时，常用的GridLayout就会作为其默认布局。

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Declaring your UI layout in XML rather than runtime code is useful for several reasons, but it's especially important so you can create different layouts for different screen sizes.

在XML中声明你的UI布局，而非运行时刻的代码中，在一些时候是有用的，尤其是你可以为不同的屏幕大小创建不同的布局。

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