How to mute audio in headset but let it play on speaker programmatically?

by 
AudioManager am = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);
am.setMode(AudioManager.MODE_IN_CALL);
am.setSpeakerphoneOn(true);

And then play the sound through the AudioManager.STREAM_SYSTEM stream.

When the sound’s finished playing be sure to return the audio manager to its previous state or it’ll stay on loudspeaker!!

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