How can Android Apps "automatically bounce back when someone slides away"?

I tried that when phone A is pressed, phone B will automatically open the application I made after completely closing the program.

Thanks

My guess is that folks would soon uninstall such an intrusive app if they experienced that type of behaviour, even if it were possible.

You will have to let phone B know, when your app should be opened there, for example from phone A send a sms to phone B and use the sms receiver extension to autostart your app there

Taifun

This can also be implemented through Cloud DB

Thanks, I'll try it.