android代码实现免提功能

初始化AudioManager:

private static AudioManager audioManager;

实现免提功能方法

protected void setSpeekModle() {
   audioManager.setMode(AudioManager.MODE_IN_CALL);
   audioManager.setSpeakerphoneOn(!audioManager.isSpeakerphoneOn());

  }

需要添加的权限：

<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>

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