bluetooth servo control Android

Hello
I've tried for weeks now to control a servo motor with an Android smartphone App ...

tried several ways (building a MIT app, ...)

It seems that it won't work with the Sony's kid smartphone !

Do you have any solution that runs, I mean code and Android App ?
Best regards
Philippe

I know little or nothing about Android programming. The examples in Serial Input Basics should be good for receiving Bluetooth data in an Arduino. Just get the Android to send data in the appropriate format.

...R