Android側のソースにsetVolumeControlStreamを書いてあればOK。

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package hoge;
  
import org.cocos2dx.lib.Cocos2dxActivity;
import android.os.Bundle;
import android.media.AudioManager;
  
public class Hoge extends Cocos2dxActivity {
  
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setVolumeControlStream(AudioManager.STREAM_MUSIC);
    }
     
    static {
         System.loadLibrary("cocos2dcpp");
    }
}
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