You can integrate voice search in your Android app by adding just a few lines. For example, users can now say to the Google app: “Ok Google, search Hawaiian pizza on Eat24”, “Ok Google, search for hotels in Maui on TripAdvisor” or “Ok Google, search for Hawaiian Music on TuneIn” thanks to Google Now Actions. Google Now Actions allow you to take advantage of Google’s speech recognition technology to understand natural language, and turn it into Android intents delivered to your app.
Try the code sample: https://github.com/google/search-samples/tree/master/search-action and learn more at http://developer.android.com/guide/components/intents-common.html#Search
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