Question

我收到错误，我不确定是否可以将JSONObject更改为JSONArray。

我正在下载JSON并希望从中获取一个值（在朋友栏目中）。有了这个值，我需要运行第二个网址来下载其他JSON。

但是我收到了这个错误：

06-03 19:50:15.853: W/System.err(26492): org.json.JSONException: Value [{"friends":"HIDDENEMAIL@MAIL.com","name":"HIDDENEMAIL@MAIL.com"}] of type     org.json.JSONArray cannot be converted to JSONObject
06-03 19:50:15.863: W/System.err(26492):    at org.json.JSON.typeMismatch(JSON.java:111)
06-03 19:50:15.873: W/System.err(26492):    at org.json.JSONObject.<init>(JSONObject.java:159)
06-03 19:50:15.883: W/System.err(26492):    at org.json.JSONObject.<init>(JSONObject.java:172)
06-03 19:50:15.903: W/System.err(26492):    at info.androidhive.jsonparsen.sharedUser$GetContacts.doInBackground(sharedUser.java:122)
06-03 19:50:15.913: W/System.err(26492):    at info.androidhive.jsonparsen.sharedUser$GetContacts.doInBackground(sharedUser.java:1)
06-03 19:50:15.913: W/System.err(26492):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
06-03 19:50:15.923: W/System.err(26492):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
06-03 19:50:15.923: W/System.err(26492):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
06-03 19:50:15.933: W/System.err(26492):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
06-03 19:50:15.933: W/System.err(26492):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
06-03 19:50:15.933: W/System.err(26492):    at java.lang.Thread.run(Thread.java:841)

下载JSON的代码：

protected Void doInBackground(Void... arg0) {
        // Creating service handler class instance
        ServiceHandler sh = new ServiceHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

        Log.d("Response: ", "> " + jsonStr);

        if (!jsonStr.isEmpty()) {
            try {
//DEBUGER shows the following  line is the line it catches an error and moves to JSONexception e;
                JSONObject jsonObj = new JSONObject(jsonStr);
                //TODO run this multiple times. 
                //TODO edit php colomn names
                //TODO add fname and lname to database without losing the previous one.
                // Getting JSON Array node
                contacts = jsonObj.getJSONArray(TAG_CONTACTS);
                JSONObject first = contacts.getJSONObject(0);
                Log.d("response email ", first.getString("friends"));
                String emails = first.getString("friends");
                Log.i("check if empty", ""+emails);
                if(!emails.isEmpty()){
                    url1 = "http://EXAMPLEURL.COM/API
                    ServiceHandler sh1 = new ServiceHandler();
                    String jsonStrShare = sh1.makeServiceCall(url1, ServiceHandler.GET);
                        JSONObject jsonObj1 = new JSONObject(jsonStrShare);
                        contacts1 = jsonObj1.getJSONArray(TAG_CONTACTS);
                // looping through All Contacts
                for (int i = 0; i < contacts1.length(); i++) {
                    JSONObject c = contacts1.getJSONObject(i);

                    String id = c.getString(TAG_FIRSTNAME);
                    String lastsharename = c.getString(TAG_LASTNAME);
                    String email = c.getString(TAG_EMAIL);
                    String list = c.getString(TAG_LIST);

                    // tmp hashmap for single contact
                    HashMap<String, String> contact = new HashMap<String, String>();

                    // adding each child node to HashMap key => value
                    contact.put(TAG_FIRSTNAME, id);
                    contact.put(TAG_LASTNAME, lastsharename);
                    contact.put(TAG_EMAIL, email);
                    contact.put(TAG_LIST, list);
                    //contact.put(TAG_PHONE_MOBILE, mobile);

                    // adding contact to contact list
                    contactList.add(contact);

                }
                }   
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }

        return null;
    }

我如何纠正这个问题呢？

Answer 1

如果json字符串以[则其数组

]开头

如果json字符串以{then its object

开头

[“friends”：===＆gt;是数组

因此：

JsonArray jsonArr = new JsonArray(json);
JsonObject jsonObj = jsonArr.getJSONObject(0);

typeMismatch jsonarray＆amp;的JSONObject

1 个答案: