I can power off smartphone without password, it isn't security.
How to setting to require password when Power off.
Why would you want to do that?.......just wondering.
Hi Anh Tuyen,
You could always download an app from the Play Store that can do this for you.
For example this one - called Smart Lockscreen protector - was mentioned on another forum: https://play.google.com/store/apps/details?id=com.nezdroid.lockscreenprotector
Please note, I have not tested this myself so I can't vouch for its functionality, but it might be worth a try.
Have a great day!
I need it to prevent thief.