org.ros.internal.message.$Proxy2 cannot be cast to std_msgs.Int16MultiArray

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When sending audio message from my android device to the ros in pc, I got this error. My code is like:

final Publisher<int16multiarray> publisher_audio = connectedNode.newPublisher("chatter", Int16MultiArray._TYPE); Int16MultiArray audio_str = publisher_audio.newMessage(); audio_str.setData(audioData); publisher_audio.publish(audio_str);

And the audioData is "short[]", which I captured by AudioRecord.

So what is the problem? How can I send the audio message to the ros?