This application measures round-trip audio latency on an iOS or Android device.

Low round-trip audio latency is a strong indicator of how well any mobile device is optimized for professional audio. Lower latency confers significant benefits to users of all sorts of apps like games, augmented hearing apps, VOIP and other interactive apps.
Read more: http://superpowered.com/latency

The core of this app is a cross-platform class under: Android/app/src/main/jni/latencyMeasurer.cpp