They are lifecycle callback methods.
它们是生命周期回调方法。
Delegates can be used to define callback methods.
委派可用于定义回呼方法。
Write callback methods to fetch the information from an XML document.
编写回调方法，从XML文档中提取信息。
One final detail remains: these callback methods return a Boolean value.
还有最后一点细节需要注意：这些回调方法返回一个布尔值。
Many of the methods provided in RqGuiApp require the use of a callback object.
很多在RqGuiApp中提供的方法需要使用回调对象。
Asynchronous methods should have a Callback type as the last argument.
异步的方法最后一个方法的参数类型应该是Callback。
Asynchronous methods should have a Callback type as the last argument.
异步的方法最后一个方法的参数类型应该是Callback。
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