Hi! Here is an example of circle.yml with dependency caching.

https://github.com/mapzen/android/blob/master/circle.yml

Note: For newer versions of most support libraries it is no longer necessary to cache /usr/local/android-sdk-linux/extras/android/m2repository. Now that most artifacts are available in the Google Maven repo these will be automatically cached in the .gradle/ folder which is persisted from one build to the next in Circle CI by default.