android 创建会话不唯一问题

我们APP之间创建的会话可唯一，如何与java后台创建的会话是同一个
这是app创建会话的方法

 client.createConversation(Arrays.asList(chatId), chatName, null, false, true, new AVIMConversationCreatedCallback() {
                @Override
                public void done(final AVIMConversation conversation, AVIMException e) {
                    if (e == null) {
                        Chat2Activity.this.conversation = conversation;
                        UnreadUtil.updateUnreadCount(conversation.getConversationId(),0);
                        EventCenter.getInstance().onUnreadCountUpdate.send(this, null, null);
                        conversation.read();
                        //加入会话
                        conversation.join(new AVIMConversationCallback() {
                            @Override
                            public void done(AVIMException e) {
                                if (e == null) {
                                    //加入成功
                                    conversation.addMembers(Arrays.asList(chatId), new AVIMConversationCallback() {
                                        @Override
                                        public void done(AVIMException e) {
                                            if (e == null) {
                                                //添加对话成员成功
                                            }
                                        }
                                    });
                                }
                            }
                        });
                        appMessage = AppMessage.getDefaultMessageTools(conversation);
                        loadConversation();
                    }
                }
            });

这是后台api创建的方法

	/**
	 * 發送消息
	 * @param msgType
	 * @param from
	 * @param toId
	 * @param title
	 * @param msg
	 * @param extMap
	 * @throws Exception
	 */
	public void sendMsgAndFCM(String msgType,final String from,final String toId,final String title,final String msg,final Map extMap) throws Exception{
		
		AVHttpClient httpClient = new AVHttpClient();
		OkHttpClient okhttpClient = new OkHttpClient();
		
        JSONObject jsonObject = new JSONObject();
        //判斷是否存在該會話，是則直接返回會話id
        String getConversation="https://"+lcId.substring(0, 8)+".api.lncld.net/1.1/cloudQuery?cql=select * from _Conversation where uniqueId='"+from+"_"+toId+"' and convid='"+from+"_"+toId+"'";
        
        Map map = new HashMap();
        map.put("X-LC-Id", lcId);
        map.put("X-LC-Key", lcMasterKey);
        
        Headers headers = Headers.of(map);
        
        Request request = getRequest(getConversation,headers, jsonObject,false);

        Response response = okhttpClient.newCall(request).execute();
    
    String result = getResponseContent(response.body().byteStream());

    JSONObject resultJson = null;
    if(result.contains("objectId")){
    	resultJson = new JSONObject(result).getJSONArray("results").getJSONObject(0);
    }else{
    	//不存在，直接新建會話
    	jsonObject = new JSONObject();
		jsonObject.put("name", "小摩通知");
		List list = new ArrayList();
		list.add(from);
		list.add(toId);
		//list.add(toId);
		jsonObject.put("m", list);
		jsonObject.put("tr", false);
		//jsonObject.put("c", toId);
		//下面的加了就不能收到了
		//jsonObject.put("sys", true);
		jsonObject.put("unique", true);
		jsonObject.put("uniqueId", from+"_"+toId);
		jsonObject.put("convid", from+"_"+toId);
		
        System.out.println(jsonObject.toString());
        
        map.put("X-LC-Key", lcKey);
        map.put("Content-Type","application/json");
        
        headers = Headers.of(map);
        
        request = postRequest(conversationUrl,headers, jsonObject,false);
        response = okhttpClient.newCall(request).execute();
        result = getResponseContent(response.body().byteStream());
        System.out.println("result:"+result);
        if(result.contains("objectId")){
        	resultJson = new JSONObject(result);
        	System.out.println("6666:"+resultJson);
        	//to = (String);
        }else if(result.contains("\"code\":137")){
        	//to = toId;
        }
    }
    //發送以上建立的會話消息
	jsonObject = new JSONObject();
	jsonObject.put("conv_id", resultJson.get("objectId"));
	jsonObject.put("no_sync", true);
	jsonObject.put("from_peer", from);
	List toList = new ArrayList();
	toList.add(from);
	toList.add(toId);
	jsonObject.put("to_peers", toList);
	
	JSONObject messageJsonObject = new JSONObject();
	
	messageJsonObject.put("_lctype", -1);
	messageJsonObject.put("_lctext", msg);
	
	messageJsonObject.put("_lcattrs", extMap);
    
	jsonObject.put("message", messageJsonObject);

	//IOS离线时使用
	messageJsonObject = new JSONObject();
	messageJsonObject.put("category", "摩美客系统消息");
	messageJsonObject.put("_profile", "dev");
	messageJsonObject.put("alert", msg);
	messageJsonObject.put("title", title);
	messageJsonObject.put("body", msg);
	messageJsonObject.put("badge", "Increment");
	messageJsonObject.put("sound", "default");
	messageJsonObject.put("content-available", 0);
	//messageJsonObject.put("custom-key", "由用户添加的自定义属性，custom-key 仅是举例，可随意替换");
	messageJsonObject.put("type", from);
	messageJsonObject.put("from", from);
	messageJsonObject.put("to", toList);
	messageJsonObject.put("mutable-content", 1);
	messageJsonObject.put("extMap", extMap);
	jsonObject.put("push_data", messageJsonObject);  

	jsonObject.put("transient", false);		
    System.out.println(jsonObject.toString());
    

    map.put("X-LC-Key", lcMasterKey);
    
    headers = Headers.of(map);
	httpClient.execute(postRequest(messageUrl,headers, jsonObject,true), false, new AsyncHttpResponseHandler(){
		@Override
		public void onSuccess(int statusCode, Header[] headers, byte[] body) {
			// TODO Auto-generated method stub
			System.out.println(statusCode);
			try {
				System.out.println("status1:"+statusCode+" "+new String(body,"utf-8"));
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		@Override
		public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
			// TODO Auto-generated method stub
			System.out.println("status2:"+statusCode+" "+"error");
			error.printStackTrace();
		}			
	});
	sendFcm(from, toId, title,msg,extMap);
}