最后，注意上述代码获得一个在布局XML中创建的按钮的句柄，并添加一个单击事件处理程序。

Finally, notice that we get a handle on the button we created in the layout XML and add a click event handler.

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这用语言也许很难描绘，但只要动手实践便不难理解。最后的结果是布局系统十分灵活，但学习起来却比较困难。

It's all a lot harder to understand in text than in application, but the result is a flexible layout system with a rather steep learning curve.

youdao

最后，小部件的定义文件还指定了小部件视图和编辑模式的布局。

Lastly, the widget definition file also specifies the widget layout for view and edit modes.

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