I am disabled and need to be able to use an android phone or tablet completely by voice. I know there are a good number of voice-recognition apps, but to my knowledge, you have to press a button every time you need the device to listen to you. Is there an app that I could initiate by voice? If that's not possible, is there an app that someone could initiate for me, and from there I could start controlling other functions by voice? In other words, an app that would continue actively listening for my voice for longer periods of time.