Android - Substantial development in Scala

Has anyone had success developing a substantial Android app in Scala? Is it a viable option yet? Are there any mature development environments? Given the state of the Scala Eclipse plug-in, it looks as if there is no good IDE support at all other than possibly IntelliJ Ultimate.

A few people have posted tutorials describing how to fudge Eclipse ADT to sort-of support Scala, and how to slim the Scala libraries using Proguard, but beyond that there has been worryingly little discussion about this topic.

Update 2011-08-01: An interesting article on Android+Scala from the developers behind the Bump app:http://devblog.bu.mp/how-we-use-scala-in-bump-for-android

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Android - Could not find adb.exe after upgrade to Android SDK 2.3

I have upgraded my Android SDK to version 2.3 and Android Development Tools 8.0.0. Now in Eclipse, I get an error message:

Could not find C:\Program Files (x86)\Android\android-sdk-windows\platform-tools\adb.exe!

And I don't have that file. How can I fix this? Is it a bug in the Android SDK 2.3 or Android Development Tools 8.0.0?

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Android - Emulator problem in Android

When I launch the emulator I face many problems (Errors):-

HttpConnectionApp]emulator-5554 disconnected! Cancelling 'net.paxcel.http.HttpConnectionApp activity launch'! 
 Emulator]emulator: ERROR: the user data image is used by another emulator. 
aborting 

Each time I have to re-run it but all in vain. How can I improve this so that I can re-run the application on same AVD?

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