ChatStateListener无法正常工作

Question

实施smack API，现在尝试获取聊天状态，例如用户是Composing，Paused等。到目前为止我做了什么

public class IncomingChatListener implements  ChatMessageListener, ChatStateListener {

        @Override
        public void stateChanged(Chat chat, ChatState state) {
            Log.d("-----","into chat state");
            if (ChatState.composing.equals(state)) {
                Log.d("Chat State",chat.getParticipant() + " is typing..");
            } else if (ChatState.gone.equals(state)) {
                Log.d("Chat State",chat.getParticipant() + " has left the conversation.");
            } else {
                Log.d("Chat State",chat.getParticipant() + ": " + state.name());
            }
        }
public void processMessage(Chat chat, Message message) {
.......
......

}

当用户输入时，我发送的状态如下：

ChatStateManager.getInstance(connection).setCurrentState(ChatState.composing, myChat);

问题是stateChanged函数永远不会被调用，而是在processMessage函数中收到了像composing等..的chatStatus数据包。

如何在stateChanged函数中收到它？