手机已经root
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>adb root
adb server is out of date. killing...
* daemon started successfully *
adbd is already running as root
>adb remount
remount succeeded
导出hosts
>adb pull /system/etc/hosts
144 KB/s (593 bytes in 0.004s)
修改后导入
>adb push hosts /system/etc/hosts
115 KB/s (593 bytes in 0.005s)
常见问题：
>adb root
adb server is out of date. killing...
* daemon started successfully *
adbd cannot run as root in production builds
root不彻底，解决办法：
手机安装"超级adb.apk"
重启手机