See public abstract Set<String> getStringSet (String key, Set<String> defValues)

I saw that the library is deployed to maven central as a AAR and not as a normal JAR.

Since the project has no res folder this is not needed and should be just a JAR which can be downloaded and used in normal non-gradle projects.

Add support for Short.

Broken tests

Since the latest release v.1.1.0 of TypedPreferences Gradle, the Android Studio plugin and the Android SDK have evolved. For some reason the tests do no longer work. I got them running at some point in the past with Gradle 0.11 and also noticed the final release of novoda/robolectric-plugin 0.0.3-SNAPSHOT. However I cannot get them running now.

Updating the project

I already experimented with updating the project (Gradle plugin, Gradle wrapper, SDK, ...) on the feature/update-project branch. Without success with regards to running the tests.
Note, that this work relies on a locally deployed version of the novoda/robolectric-plugin as mentioned here.
Finally, before merging, this branch will be rebased or rewritten. Anyways, feel free to experiment with what I started off with.

Changing the test architecture

It might be worth looking into other test setup such as malmstein/testingarchitecture or novoda/gradle-android-test-plugin or something else since novoda/robolectric-plugin has been deprecated as of August 6, 2014.