This app was mentioned in 12 comments, with an average of 1.17 upvotes
Its possible with this and using game files from your PC i believe: https://play.google.com/store/apps/details?id=in.celest.xash3d.cs16client
I haven't set it up yet but I've used the same engine for playing Half Life and it works great
Counter Strike 1.6 and Half-Life to be played in Xash3D
You can customise weapon skins (just like how CS 1.6 works on PC), add maps but AMX mods are not working.
Why not play cs 1.6 on your phone instead
https://play.google.com/store/apps/details?id=in.celest.xash3d.cs16client
Actual Counter Strike https://play.google.com/store/apps/details?id=in.celest.xash3d.cs16client