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Existing java bytecode obfuscators should work. The one I worked on does. The Dalvik compiler translates the .class into dalvik bytecode. You can obfuscate the java bytecode and the obfuscation survives the translation layer.

It works quite well for an early version. I used it on a few apps to change some minor things in the layout. However, it does not generate actual Java source code but instead disassembles the Dalvik executables to generate smali code(http://code.google.com/p/smali/).

The smali code that is generated is in fact reassembleable. The smali format is meant to be as close to a 1-to-1 mapping for the dex file as possible. Disassembling and then immediately reassembling something will produce an equivalent (almost identical) dex file. The only things that might be different are misc. internal details, like the order of certain items, etc.