This app was mentioned in 4 comments, with an average of 1.75 upvotes
I haven't tried it since I have a laptop, but there's many IDEs for Android including AWD which looks well-reviewed for web development.
https://play.google.com/store/apps/details?id=org.kidinov.awd
I've never actually used it, but maybe this? https://play.google.com/store/apps/details?id=org.kidinov.awd
Maybe https://play.google.com/store/apps/details?id=org.kidinov.awd