I would imagine Android development, with its reliance on simulators for local UI testing, is pretty complicated to shoehorn into a web-based IDE? I think cloud-based IDEs would only really work for anything for which a text or web-based UI suffices. (Which is already quite a lot: that covers code, logs and web pages.)
For anything with native UIs, I suppose you could "remote desktop" into an app or a simulator running in the cloud but at that point you might as well run that locally and cut out all the issues introduced by networking.
For anything with native UIs, I suppose you could "remote desktop" into an app or a simulator running in the cloud but at that point you might as well run that locally and cut out all the issues introduced by networking.