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AudioManager mAudioManager = (AudioManager)getSystemService(AUDIO_SERVICE);
boolean mAudioFouus = mAudioManager.requestAudioFocus(mAudioFocusListener,AudioManager.STREAM_MUSIC,AudioManager.AUDIOFOCUS_GAIN) == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
if(mAudioFouus){
//录制
}