java - mediaplayer play sound too loud -

i've written code when event occurs, plays mp3, when happens, sound loud, , cannot made lower smartphone's buttons...

i did

mediaplayer mpok;  mpok = mediaplayer.create(this, r.raw.ding);     try {         mpok.prepare();     } catch (illegalstateexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (ioexception e) {         // todo auto-generated catch block         e.printstacktrace();     }