The Duolingo Android app now has speaking exercises!
"Who cares if we look crazy speaking to our phones in different languages!"
-Duolingo's Facebook page
I updated my app and tried this yesterday evening. It works great! I only had to repeat myself once, unlike my PC, where it seems half the time I end up disabling the microphone out of frustration. Even if there is no real speech recognition, I do think it's good practice to speak the language aloud.