If anyone interested, I made a simple C64 V2 Basic text<->PRG converter, available as a jar (Java jre 1.6) or as an apk (Android 2.2).
Not leaving my Android tablet, Now I can do a program (C64 V2 BASIC) in a text editor (Ted, ...), save it with extension .BAS, convert it in .PRG with my apk application, and import it in a C64 emulator (FRODO, ...).
And I can do the same in Windows or Linux with my jar application

The application can also transform a .PRG file into a clear .BAS one.
See you.