feval的专栏

Android O 原生代码下载，在source.android.com上都有，参考如下链接，需要vpn访问 https://source.android.com/source/downloading  英文版 https://source.android.com/source/downloading?hl=zh-cn  中文版 分支信息：https://source

/**  * {@hide}  *  * The state machine defined here is a hierarchical state machine which processes messages  * and can have states arranged hierarchically.  *  * A state is a State object and m