在Android shell里校准时间

先把curl放到/system/bin下，开机执行以下函数

time_synced=0

time_sync()
{
    if [ $time_synced -eq 0 ];then
        rawtime=`curl -A "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36" "http://time.tianqi.com/beijing" |grep "电脑时间" | tr -cd "[0-9]"`
        reslen=`echo $rawtime|wc -c`

        if [ $reslen -eq 15 ];then
            MM=`echo $rawtime | cut -b 5,6`
            dd=`echo $rawtime | cut -b 7,8`
            HH=`echo $rawtime | cut -b 9,10`
            mm=`echo $rawtime | cut -b 11,12`
            yyyy=`echo $rawtime | cut -b 1,2,3,4`
            ss=`echo $rawtime | cut -b 13,14`

            fixtime=$MM$dd$HH$mm$yyyy.$ss
            date $fixtime set
            time_synced=1
            echo "successfully sync time="$fixtime >> /data/timesync.txt
        fi
    fi
}

即从http://time.tianqi.com/beijing网页解析出北京时间，转为纯数字，判断是否为14位有效时间，解析出年月日时分秒，重新排列，按照date的格式要求设置到系统。