Here a new approach to the umpire app.
It began as a game for my sons and has become an Android Phone Umpire App
The new approach is: The app is used by players on court, for non umpire matches!!!
The score is called by phone in English, Spanish or French, and with a speaker connected to the earphone output, players and spectators can ear the score. A battery powered 10w speaker is enough for tennis.
The score is remotely operated by players on court with some of standard headset profile Bluetooth devices.
It works and I believe in the idea!
You can take a look here: TENNIS REMOTE SCORE
I need suggestions and bug reporting, specially language mistakes in English or French, to improve the app.
Thanks a lot!