Android 系统启动流分析 & Zygote启动流程分析

run方法比较大 基本上是 初始化设置一些系统属性、准备MainLooper、初始化system context对象、创建system service manager；启动各种service

private void run() {
        try {
            ........省略代码.......
            //设置一些系统属性
            if (!SystemProperties.get("persist.sys.language").isEmpty()) {
                final String languageTag = Locale.getDefault().toLanguageTag();
                SystemProperties.set("persist.sys.locale", languageTag);
                SystemProperties.set("persist.sys.language", "");
                SystemProperties.set("persist.sys.country", "");
                SystemProperties.set("persist.sys.localevar", "");
            }
            ........省略代码.......
            //2、准备MainLooper
            Looper.prepareMainLooper();
            // Initialize native services.
            System.loadLibrary("android_servers");
            ........省略代码.......
            //3、初始化system context
            createSystemContext();
            ........省略代码.......
            //4、创建system service manager
            mSystemServiceManager = new SystemServiceManager(mSystemContext);
            mSystemServiceManager.setRuntimeRestarted(mRuntimeRestart);
            LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
        }
        // Start services.
        try {
            ........省略代码.......
            //启动各种service
            startBootstrapServices();
            startCoreServices();
            //joe add here start serevice reoder for fastboot 20180830
            if(SystemProperties.getBoolean("ro.quectel.bootfast", false)){                
                startOtherServices_reOrgnize();
            }else{
		   startOtherServices();
            }
        } catch (Throwable ex) {
            Slog.e("System", "******************************************");
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
        }
        // Loop forever.
        Looper.loop();
    }

mActivityManagerService.systemReady(new Runnable() {
            @Override
            public void run() {
                ...........省略代码........
                //开启UI
                try {
                    startSystemUi(context);
                } catch (Throwable e) {
                    reportWtf("starting System UI", e);
                }
                //开启网络
                try {
                    if (networkScoreF != null) networkScoreF.systemReady();
                } catch (Throwable e) {
                    reportWtf("making Network Score Service ready", e);
                }
                try {
                    if (networkManagementF != null) networkManagementF.systemReady();
                } catch (Throwable e) {
                    reportWtf("making Network Managment Service ready", e);
                }
                try {
                    if (networkStatsF != null) networkStatsF.systemReady();
                } catch (Throwable e) {
                    reportWtf("making Network Stats Service ready", e);
                }
                try {
                    if (networkPolicyF != null) networkPolicyF.systemReady();
                } catch (Throwable e) {
                    reportWtf("making Network Policy Service ready", e);
                }
                try {
                    if (connectivityF != null) connectivityF.systemReady();
                } catch (Throwable e) {
                    reportWtf("making Connectivity Service ready", e);
                }
}