Now that our prototype can handle different presets, we should provide a fast way to change, create, or edit user presets through voice recognition. One of the easiest ways to manage voice recognition is to use Android's Intent messaging object to delegate this action to another application component. As we discussed at the beginning of the chapter, if we install and configure a compliant voice input application, Android can use it for voice recognition.

The main goal is to provide an abstract class that will be extended by our activities in order to manage recognition callback, while avoiding code repetition. The overall design is as follows: