问开箱后Android手机第一次开机的时间？

EN

    @Override
    public void onStart() {
        mInjector.init();
        ...

        synchronized (mLock) {
            mHandler = new AlarmHandler();
            mConstants = new Constants();
            ...

            // We have to set current TimeZone info to kernel
            // because kernel doesn't keep this after reboot
            setTimeZoneImpl(SystemProperties.get(TIMEZONE_PROPERTY));

            // Ensure that we're booting with a halfway sensible current time.  Use the
            // most recent of Build.TIME, the root file system's timestamp, and the
            // value of the ro.build.date.utc system property (which is in seconds).
            final long systemBuildTime = Long.max(
                    1000L * SystemProperties.getLong("ro.build.date.utc", -1L),
                    Long.max(Environment.getRootDirectory().lastModified(), Build.TIME));
            if (mInjector.getCurrentTimeMillis() < systemBuildTime) {
                Slog.i(TAG, "Current time only " + mInjector.getCurrentTimeMillis()
                        + ", advancing to build time " + systemBuildTime);
                mInjector.setKernelTime(systemBuildTime);
            }