分析WifiP2pService启动流程，主要流程参考流程图

从SystemServer开始分析：

frameworks/base/services/java/com/android/server/SystemServer.java

private static final String WIFI_P2P_SERVICE_CLASS =

"com.android.server.wifi.p2p.WifiP2pService";

frameworks/opt/net/wifi/service/java/com/android/server/wifi/p2p/WifiP2pService.java

frameworks/base/services/core/java/com/android/server/SystemServiceManager.java

frameworks/opt/net/wifi/service/java/com/android/server/wifi/p2p/WifiP2pServiceImpl.java

frameworks/base/services/core/java/com/android/server/NetworkManagementService.java

Log信息：

SystemServer: StartWifiP2P

SystemServiceManager: Starting com.android.server.wifi.p2p.WifiP2pService

流程图：