Android : I can't save accents in MySQL database from Android app

I am developing comments in my Android app, and when I write a comment with an accent, it doesn't save succesfully in my MySQL database and I don't know why... I suppose that is an error with charset, but I don't know certainly.

I work with a Glassfish server and I try to set the same charset in JDBC resource, in Eclipse and in MySQL database, but it still not working and I've left everything default again.

Could anyone help me? Great thanks!