I use a LG G2 with Android 4.4.2 and the exercise recording the Polar Beat app in conjunction with the Polar H7 chest sensor for heart rate measurement. Complementing I wanted to integrate the two sensors for speed and cadence. Unfortunately it does not work with the Polar Beat app though is specially pointed in the user manual of Polar thereupon. Also, I have not yet found any other Android training app that recognizes the Dinger.
I used to have a system in parallel for an iPhone 4S, which worked smoothly. The integration of BT 4.0 Sensors is there solved better.