Question: Is there any way to manually focus the camera on my Android phone?

I know that you can tap on where to focus, but that's just assisted auto focus. What I want is to be able to manually adjust the focus.

Answer: 
My Hauwei Mate 9 has manual focus, ISO, and shutter speed options. I use it frequently for sunsets and stage lighting.
Only 8 years later, the Moment Pro Photo app can now do this. May not be available for every phone, but it works as advertised on mine, specifically the manual focus.

<https://play.google.com/store/apps/details?id=com.shopmoment.momentprocamera>