Cvcamera is a project mainly written in JAVA and C++, it's free.
Feature tracking on Android using OpenCV computer vision library.
This project is a fork of the CVCamera app in the ROS repository:
https://code.ros.org/svn/opencv/branches/2.2/opencv/android/apps/CVCamera/
Added the cvGoodFeaturesToTrack method to the list of feature detection methods in the program.
Plans are to explore and refine the detection.
Steps to build:
Documentation for original CVCamera:
http://code.google.com/p/android-opencv/wiki/CVCamera