JSON解析器无法转换我的字符串

时间:2015-05-09 12:59:11

标签: php android mysql json

我正在开发一个从PHP MysQl服务器收集某些信息的Android应用程序,但是我遇到了JSON Parser的问题,有时候它有效它不起作用,它给了我这些错误:

    E/JSON Parser﹕ Error parsing data org.json.JSONException: Value Failed of type java.lang.String cannot be converted to JSONObject
    Caused by: java.lang.NullPointerException

产生错误的代码:

try {
                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("username", username));
                params.add(new BasicNameValuePair("password", password));
                params.add(new BasicNameValuePair("fname", fname));
                params.add(new BasicNameValuePair("lname", lname));
                params.add(new BasicNameValuePair("email", email));
                params.add(new BasicNameValuePair("city", city));
                params.add(new BasicNameValuePair("nrc", nrc));
                params.add(new BasicNameValuePair("dob", dob));
                params.add(new BasicNameValuePair("cell", cell));




                Log.d("username", username);
                Log.d("password", password);
                Log.d("fname", fname);
                Log.d("lname",lname );
                Log.d("email",email );
                Log.d("city",city );
                Log.d("nrc",nrc );
                Log.d("dob",dob );
                Log.d("cell",cell );



                Log.d("request!", "starting");

                //Posting user data to script
                JSONObject json = jsonParser.makeHttpRequest(
                        REGISTER_URL, "POST", params);

                // full json response
                Log.d("Registering attempt", json.toString());


                // json success element
                success = json.getInt(TAG_SUCCESS);
                if (success == 1) {
                    Log.d("User Profile Created!", json.toString());

NullException是由Line引起的:

    Log.d("Registering attempt", json.toString());

1 个答案:

答案 0 :(得分:0)

我认为这里的问题是你没有得到正确的JSON字符串作为回复。确保行jsonParser.makeHttpRequest(REGISTER_URL, "POST", params);返回正确的jSON字符串。在那里放置一个断点并尝试调试以检查您是否收到了正确的JSON响应。希望它有所帮助。