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Comment by stephenjudkins | Hacker News Reader

There are a few obstacles to easily using Scala on Android. Namely, the Scala standard library is too large to be easily "dexed" by the Android toolchain. Using Proguard or a similar treeshaker removes unused classes, but it's a bit of a hassle to set up manually.

However, I've found that using the SBT Android plugin (https://github.com/jberkel/android-plugin) makes the entire process relatively painless. I recommend starting with that approach.

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I wrote a small tutorial on manually setting up Android with Scala:

http://brianmckenna.org/blog/minimalist_android_scala_env

Enabling ProGuard is done by adding the following to build.xml:

    <target name="-debug-obfuscation-check">
        <property name="proguard.enabled" value="true" />
        <path id="out.dex.jar.input.ref" />
    </target>

Also add "proguard.config=proguard.cfg" to default.properties and "-dontwarn" to proguard.cfg.

Yea, setting that up by hand can be a PITA. jberkel's plugin helps out a lot.

Also, if you're interested in using Robolectric with Scala then this helps (warning, shameless plug) https://github.com/jbrechtel/robospecs

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