Puck button integration with android device.

Thanks Ollie/Gordan,

Sorry for being bit unclear in my query. I think I'm looking to build an app. Let me clarify bit more if it helps.

I need this button to work as below: Someone who is visually impaired wants to call an emergency number[say a family member] from his Android phone. Instead of dialling number/searching in phone book, he could just do a single click to call number a, double click call number b from such button which is paired with his phone.

Your guidance on this will be appreciated.
Regards,