Android JSONObject在尝试发送时变为null

Question

当我试图将JSONObject推过数据流时，我已经正确构建了JSONObject，但随后我尝试将其发布到流，它是空的。

JSONObject position = new JSONObject();
        try {
            position.put("lat", location.getLatitude());
            position.put("lng", location.getLongitude());
        } catch (JSONException e) {
            System.out.println("json not work");
            e.printStackTrace();
        }
        System.out.println(position) //result: {"lat":37,"lng":-122}
        pubNub.publish().message(position)//never sent, if other type it works

Answer 1

try pubNub.publish().message(position.toString());