SystemUI简介

http://wenku.baidu.com/link?url=p9hBaL4tmc6Z6fAxar23459qPEv3EqDBCW71SmdrphTA0vU02ZWVayNkEItvkP1WSk4LBK1etiYyGQteZUjql6Ds8dmMMCGNdiuJpiIE18W