If you can configure API level 8 or higher (Android 2.2), check out AudioManager , specifically requestAudioFocus()with AUDIOFOCUS_GAIN_TRANSIENTand AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCKand abandonAudioFocus().
, . AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK requestAudioFocus(), , , , , abandonAudioFocus().
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, , abandonAudioFocus(), . , MediaPlayer TextToSpeech , , ( SoundPool, .)