Recognizing a non-word sound on android

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http://stackoverflow.com – Background: I started working out at the gym. Currently, I'm working only on triceps. I determine to myself some sets that I have to do every time I'm at the gym. As you might know, the fitness appliance that works on triceps look like some iron rods connected to weights that I have to lift up. So, I thought that I'll log it in my Android phone, So I'll really know what I did and what I didn't. So, I would have to create an .Xml file which record what I really did. But if I'll put the number manually, I'll lose all the point, So... Question: I need, somehow, to recognize the weights- (HowTos)