尝试以下代码：

private void setMicMuted(boolean state){

AudioManager myAudioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);

// get the working mode and keep it

int workingAudioMode = myAudioManager.getMode();

myAudioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);

// change mic state only if needed

if (myAudioManager.isMicrophoneMute() != state) {

myAudioManager.setMicrophoneMute(state);

}

// set back the original working mode

myAudioManager.setMode(workingAudioMode);

}