Hi there,
it is not really possible. Some third party android systems allow such think (I think Sony has this function) but it is not reliable and applicable for all devices.
For such tasks I can implement a special widget. I made such thing for exact application and it is working good, tested! The widget could be placed on desktop and act like an icon, but controllable from the code of us.
Let's discuss your project further! I am excited to hear from you soon.
With best regards,
Sargis