android开发，pdk文件的描述，底层实现，对此进行描述性指导。-android development, pdk file descr iption, the underlying implementation, this descr iptive guidance.

一个口实现串口收发数据,用的是PDK弹片机、已经能够很成功-A port serial data transceiver with PDK shrapnel have been able to be very successful