Android 启动过程汇总

核心提示：device/libs/android_servers/com_android_server_SystemServers. It only calls system_init implemented in device/servers/system/library/system_init.cpp.l If runnin

device/libs/android_servers/com_android_server_SystemServers. It only calls system_init implemented in device/servers/system/library/system_init.cpp.

l If running on simulator, instantiate AudioFlinger, MediaPlayerService and CameraService here.

l Call init2 function in JAVA class named com.android.server.SystemServer, whose source is in device/java/services/com/android/server. This function is very critical for Android because it start all of Android JAVA services.

l If not running on simulator, call IPCThreadState::self()->joinThreadPool() to enter into service dispatcher.

SystemServer::init2 will start a new thread to start all JAVA services as follows:

Core Services:

1. Starting Power Manager

2. Creating Activity Manager

3. Starting Telephony Registry

4. Starting Package Manager

5. Set Activity Manager Service as System Process

6. Starting Context Manager

7. Starting System Context Providers

8. Starting Battery Service

9. Starting Alarm Manager

10. Starting Sensor Service

11. Starting Window Manager

12. Starting Bluetooth Service

13. Starting Mount Service

Other services

1. Starting Status Bar Service

2. Starting Hardware Service

3. Starting NetStat Service

4. Starting Connectivity Service

5. Starting Notification Manager

6. Starting DeviceStorageMonitor Service

7. Starting Location Manager

8. Starting Search Service

9. Starting Clipboard Service

10. Starting Checkin Service

11. Starting Wallpaper Service

12. Starting Audio Service

13. Starting HeadsetObserver

14. Starting AdbSettingsObserver

Finally SystemServer::init2 will call ActivityManagerService.systemReady to