Explore all the sensing capabilities of your Android device!
For developers, understand and tweak the API parameters to interactively learn how to use the APIs.

Androids are alive! They can sense movement, environmental properties, images, audio, and radio signals. They can even understand your voice using speech recognition. This app allows you to experiment with all these sensing capabilities.

Covers the following sensing capabilities:
Location Based Services: Current location, tracking location over time, Proximity alerts
Physical Sensors: Orientation, Movement, Barometer, and other sensors.
Speech Recognition
Text-to-Speech
Image Processing
Audio Processing

This app is from this book:
Android Sensor Programming By Greg Milette and Adam Stroud,

Source code available at:
https://github.com/gast-lib