Apps MediaPlayer headset Problem

[fjizj]

Hi!
I have the MediaPlayer, But the sound from headset and speaker out when the headset plug.
How do I play media the sound just from headset out ??

this is the LogCat when the headset plug

DEBUG/AudioHardwareQSD(139): Switching audio device to
DEBUG/AudioHardwareQSD(139): Stereo Headset + Speaker

Please, help.
Sorry for my English, it's not my native language.