Allow your activity to restart when a configuration changes, but carry a stateful Object to the new instance of your activity.
当配置发生改变时允许你的Activity重启，但让其携带一个有状态的对象到你的新activity实例中。
Object methods bring other advantages to designing stateful systems.
对象方法为有状态系统的设计带来其他优势。
The target page USES this information in order to build a stateful reference to the calling page object.
目标页使用此信息来创建一个完整状态的引用来调用页对象。
应用推荐