TiddlyWiki + Dropbox + Android
Have you tried this

http://tiddlyspot.com/

it basically creates a tiddly on a web server, so you can edit it with every android browser able to render it. You can download it, edit offline and when online sync it with the server version.

Opera Mobile is not able to edit offline a tiddlywiki and save changes. Firefox mobile can. Other browsers i dont know. Normally they need a .jar Java file which the mobile browsers often cant execute afaik.