[android-developers] How to play the music in the earpiece instead of speaker?

Hi, all
In my app, I use the MediaPlayer, the sound comes from the speaker.
I just want to know how to play the music in the earpiece.

The dev guide says that "You can play back the audio data only to
the standard output device; currently, that is the mobile device
speaker or Bluetooth headset. You cannot play sound files in the
conversation audio.". But actually I have seen some apps that can play
sound in the channel which conversation audio comes from.

Did I miss anything? Thanks in advance.
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