Android 收到消息怎么区分类型

	/**

	 * get type of item

	 */

	public int getItemViewType(int position) {

		EMMessage message = getItem(position); 

		if (message == null) {

			return -1;

		}

		

		if(customRowProvider != null && customRowProvider.getCustomChatRowType(message) > 0){

		    return customRowProvider.getCustomChatRowType(message) + 13;

		}

		

		if (message.getType() == EMMessage.Type.TXT) {

		    if(message.getBooleanAttribute(EaseConstant.MESSAGE_ATTR_IS_BIG_EXPRESSION, false)){

		        return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_EXPRESSION : MESSAGE_TYPE_SENT_EXPRESSION;

		    }

			return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_TXT : MESSAGE_TYPE_SENT_TXT;

		}

		if (message.getType() == EMMessage.Type.IMAGE) {

			return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_IMAGE : MESSAGE_TYPE_SENT_IMAGE;



		}

		if (message.getType() == EMMessage.Type.LOCATION) {

			return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_LOCATION : MESSAGE_TYPE_SENT_LOCATION;

		}

		if (message.getType() == EMMessage.Type.VOICE) {

			return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_VOICE : MESSAGE_TYPE_SENT_VOICE;

		}

		if (message.getType() == EMMessage.Type.VIDEO) {

			return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_VIDEO : MESSAGE_TYPE_SENT_VIDEO;

		}

		if (message.getType() == EMMessage.Type.FILE) {

			return message.direct() == EMMessage.Direct.RECEIVE ? MESSAGE_TYPE_RECV_FILE : MESSAGE_TYPE_SENT_FILE;

		}



		return -1;// invalid

	}