OpenCv Android Samples from OpenCV SDK using Android Studio and Gradle System:

-> Tutorial 1 Camera Preview
-> Tutorial 2 Mixed Processing (uses JNI)
-> Tutorial 3 Camera Control
-> Image Manipulations
-> Face Detection (uses JNI)
-> Color Blob Detection
-> Puzzle 15

Code available on GitHub: https://github.com/joaopedronardari/OpenCV-AndroidSamples