You can use Zapstore, F-Droid, or Google Play Store to download Termux which you will use to install xmrig:

https://xmrig.com/docs/miner

https://v.nostr.build/s0vFHRFoHVaR2WJD.mp4

Gist:

https://gist.github.com/2niuhe/f9c0a1168ebc02bd0b89ffdb7ed21f6c

Video Source:

https://youtu.be/cPXrqpBi02s