Is it possible to program Android apps in Clojure? Can anybody suggest a good tutorial or book, if it is possible?
Yes, here is main project I am aware of: https://github.com/remvee/clojurehelloandroid
And here is a little tutorial http://riddell.us/ClojureAndAndroidWithEmacsOnUbuntu.html though I would not be surprised if this tutorial is outdated, as it was over a year ago when I played with the code following this tutorial, and remvee's code has since been updated.
EDIT: see the update here from Stuart Sierra and the Clojure/core group: http://groups.google.com/group/clojure/browse_thread/thread/876c90d3ae353c61
"Clojure 1.2.0 works "out of the box" on Android, but startup time is still a problem. Some members of Clojure/core have experimented with ways to make this better, mostly by selectively removing stuff that isn't needed at runtime.
Follow http://dev.clojure.org/display/design/Android+Support for news. The last update was by Aaron Bedra, a Clojure/core member, in December 2010. I wouldn't say it's a high priority right now, but neither have people lost interest.
I personally would not recommend writing an Android app in Clojure if you intend to release it right away. But if you're interested experimenting with Clojure on Android and making it better, then go for it."