一，Android系统完整的启动流程

二，android 系统架构图

三，init进程的启动流程

四，init进程启动服务的顺序

五，android系统启动架构图

六，Android系统运行时架构图

bool Service::Start() {// Starting a service removes it from the disabled or reset state and// immediately takes it out of the restarting state if it was in there.flags_ &= (~(SVC_DISABLED|SVC_RESTARTING|SVC_RESET|SVC_RESTART|SVC_DISABLED_START));// Running processes require no additional work --- if they're in the// process of exiting, we've ensured that they will immediately restart// on exit, unless they are ONESHOT.if (flags_ & SVC_RUNNING) {return false;}bool needs_console = (flags_ & SVC_CONSOLE);if (needs_console) {if (console_.empty()) {console_ = default_console;}// Make sure that open call succeeds to ensure a console driver is// properly registered for the device nodeint console_fd = open(console_.c_str(), O_RDWR | O_CLOEXEC);if (console_fd < 0) {PLOG(ERROR) &