按powerkey唤醒启动上层Andord

参考java http://www.jianshu.com/p/ae1e992cdae9 http://blog.csdn.net/fu_kevin0606/article/details/54408094 直接上流程图android 一，基本代码分析session 1. @InputManager.cpp (frameworks\native\services\inputflinger) Inp

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