That’s a cool application.
For Ping Viewer android integration, it can be a bit tricky, from what I know the Qt serial library does not have official support for Android, you can check more about it here.
To integrate Ping sensor with the computer or cellphone, you’ll just need a usb-serial adapter (rs232-ttl) connected between your device and ping, I recommend to use our bluart.
If you are facing problems with the serial integration in android, you could use a raspberry or an esp* microcontroller to export the serial interface via an UDP socket connection.
I hope that you share your progress with us.