我可以从 url 获取字符串响应。但是当我尝试对该响应进行 json 解析时，它会显示一些错误，如下所示。任何人都可以给出任何想法来清除它。？这是我的 Api.java 文件。
错误：
05-16 04:16:19.314: W/System.err(1582): org.json.JSONException: Value [] at needAttachment of type org.json.JSONArray cannot be converted to JSONObject
05-16 04:16:19.314: W/System.err(1582): at org.json.JSON.typeMismatch(JSON.java:100)
05-16 04:16:19.323: W/System.err(1582): at org.json.JSONObject.getJSONObject(JSONObject.java:573)
05-16 04:16:19.323: W/System.err(1582): at com.example.twitterjson.TwitterApi.getconnect(TwitterApi.java:59)
05-16 04:16:19.323: W/System.err(1582): at com.example.twitterjson.TwitterApi.doInBackground(TwitterApi.java:31)
JsonApi.java
package com.example.twitterjson;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.os.AsyncTask;
public class TwitterApi extends AsyncTask<Void, Integer, Void> implements
TwitterArraylist {
MainActivity activity;
JSONArray jsonarray;
public TwitterApi(MainActivity activity) {
this.activity = activity;
arraylist.clear();
}
protected void onPreExecute() {
super.onPreExecute();
}
protected void onPostExecute(Void result) {
activity.setup();
super.onPostExecute(result);
}
protected Void doInBackground(Void... param) {
getconnect();
return null;
}
public void getconnect() {
String url = "Some url";
InternetManager manager = new InternetManager(url);
String contentresponse = manager.Urlreq();
if (contentresponse != null) {
System.out.println("content_jsonresponse= " + contentresponse);
try {
JSONObject mainobject = new JSONObject(contentresponse);
JSONArray needarray = mainobject.getJSONArray("needs");
for (int i = 0; i < needarray.length(); i++) {
JSONObject needarrayobject = needarray.getJSONObject(i);
JSONObject needobject = needarrayobject
.getJSONObject("need");
TwitterModel t = new TwitterModel();
t.setId(needobject.getString("id"));
t.setText(needobject.getString("description"));
t.setTime(needobject.getString("created"));
JSONObject needattach = needarrayobject
.getJSONObject("needAttachment");
t.setName(needattach.getString("title"));
arraylist.add(t);
}
System.out.println("CONTENT_MODEL.size()" + arraylist.size());
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
我的杰森：
{
"needs": [
{
"need": {
"id": "197",
"title": "A new roof1",
"description": "Im hoping this shit works.",
"location_id": "1",
"status": "1",
"created": "2013-04-12 06:04:04"
},
"needAttachment": [
]
},
{
"need": {
"id": "196",
"title": "Test10",
"description": "This is the test 10 one",
"location_id": "1",
"status": "1",
"created": "2013-04-03 03:47:24"
},
"needAttachment": [
]
},
{
"need": {
"id": "194",
"title": "Draft test",
"description": "Test test",
"location_id": "1",
"status": "1",
"created": "2013-03-29 06:10:36"
},
"needAttachment": {
"id": "118",
"title": null,
"file": "\/files\/uploads\/need\/f6ad4d9a473458da7a9aabfec4fdef1b"
}
},
{
"need": {
"id": "192",
"title": "kitchen sink",
"description": "My kitchen sink is clogged",
"location_id": "1",
"status": "1",
"created": "2013-03-28 11:15:51"
},
"needAttachment": {
"id": "117",
"title": null,
"file": "\/files\/uploads\/need\/4a49d9eda8aab623e4dcb6fafd124115"
}
},
{
"need": {
"id": "191",
"title": "test5",
"description": "This is test5",
"location_id": "1",
"status": "1",
"created": "2013-03-28 07:23:57"
},
"needAttachment": {
"id": "120",
"title": null,
"file": "\/files\/uploads\/need\/31eba0e0570c6d16df7df8706c1dbcb3"
}
},
{
"need": {
"id": "190",
"title": "tree removal",
"description": "tree removal",
"location_id": "1",
"status": "1",
"created": "2013-03-26 18:25:52"
},
"needAttachment": {
"id": "110",
"title": null,
"file": "\/files\/uploads\/need\/890724880928cda88d3d665aaad2239d"
}
},
{
"need": {
"id": "189",
"title": "Roof 3",
"description": "Roof",
"location_id": "1",
"status": "1",
"created": "2013-03-25 15:08:33"
},
"needAttachment": {
"id": "99",
"title": null,
"file": "\/files\/uploads\/need\/3fff1990c035edba6fb2a728f247ef7b"
}
},
{
"need": {
"id": "188",
"title": "test3",
"description": "Test3 done here",
"location_id": "1",
"status": "1",
"created": "2013-03-25 04:04:45"
},
"needAttachment": {
"id": "102",
"title": null,
"file": "\/files\/uploads\/need\/f3e3a58076441b73000c098e5c5884b7"
}
},
{
"need": {
"id": "187",
"title": "MyBook1",
"description": "Test for MyBook1",
"location_id": "1",
"status": "1",
"created": "2013-03-24 23:13:56"
},
"needAttachment": {
"id": "104",
"title": null,
"file": "\/files\/uploads\/need\/61d3daf4f8bc67706d86577303bacd75"
}
},
{
"need": {
"id": "186",
"title": "spring cleaning",
"description": " Time for spring clean. testing the edit feature. ",
"location_id": "1",
"status": "1",
"created": "2013-03-24 18:47:09"
},
"needAttachment": {
"id": "107",
"title": null,
"file": "\/files\/uploads\/need\/0914f9b5fa843c0ee8bebea109c9444d"
}
}
]
}