Android Json分析错误:无法将类型org.Json.JSONArray转换为JSONObject
JSON很简单 [{“千瓦”:“48.90”,“千伏安”:“51.20”,“功率因数”:“-0.96”}] 我得到的错误是 08-26 02:28:49.130 13605-13641/com.whather.emshive E/main活动: url的响应:[{“kw”:“48.90”,“kva”:“51.20”,“pf”:“-0.96”}] Json分析错误:org.Json.JSONArray类型的值[{“kw”:“48.90”,“kva”:“51.20”,“pf”:“-0.96”}] 无法转换为JSONObject 08-26 02:28:49.130 13605-13641/com.whatever.emshive/JSON解析器:解析数据时出错 org.json.JSONException:Value org.json.JSONArray类型的[{“kw”:“48.90”,“kva”:“51.20”,“pf”:“-0.96”}] 无法转换为JSONObject 代码是Android Json分析错误:无法将类型org.Json.JSONArray转换为JSONObject,android,android-json,android-database,jsonparser,Android,Android Json,Android Database,Jsonparser,JSON很简单 [{“千瓦”:“48.90”,“千伏安”:“51.20”,“功率因数”:“-0.96”}] 我得到的错误是 08-26 02:28:49.130 13605-13641/com.whather.emshive E/main活动: url的响应:[{“kw”:“48.90”,“kva”:“51.20”,“pf”:“-0.96”}] Json分析错误:org.Json.JSONArray类型的值[{“kw”:“48.90”,“kva”:“51.20”,“pf”:“-0.96”}] 无
public class MainActivity extends AppCompatActivity {
private String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "http://simpleasthat.com/s.php";
ArrayList<HashMap<String, String>> contactList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.list);
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("contacts");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(0);
String kw = c.getString("kw");
String kva = c.getString("kva");
String pf = c.getString("pf");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("kw", kw);
contact.put("kva", kva);
contact.put("pf", pf);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
Log.e("JSON Parser", "Error parsing data " + e.toString());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, contactList,
R.layout.list_item, new String[]{"kw", "kva",
"pf"}, new int[]{R.id.kw,
R.id.kva, R.id.pf});
lv.setAdapter(adapter);
}
}
public类MainActivity扩展了AppCompatActivity{
私有字符串标记=MainActivity.class.getSimpleName();
私人对话;
私有ListView lv;
//获取联系人JSON的URL
专用静态字符串url=”http://simpleasthat.com/s.php";
ArrayList联系人列表;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList=新的ArrayList();
lv=(ListView)findViewById(R.id.list);
新建GetContacts().execute();
}
/**
*异步任务类通过HTTP调用获取json
*/
私有类GetContacts扩展异步任务{
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
//显示进度对话框
pDialog=新建进度对话框(MainActivity.this);
setMessage(“请稍候…”);
pDialog.setCancelable(假);
pDialog.show();
}
@凌驾
受保护的Void doInBackground(Void…arg0){
HttpHandler sh=新的HttpHandler();
//向url发出请求并获得响应
字符串jsonStr=sh.makeServiceCall(url);
Log.e(标签,“来自url的响应:+jsonStr”);
if(jsonStr!=null){
试一试{
JSONObject jsonObj=新的JSONObject(jsonStr);
//获取JSON数组节点
JSONArray contacts=jsonObj.getJSONArray(“contacts”);
//通过所有触点循环
对于(int i=0;ivalue
触点。输入(“kw”,kw);
触点输入(“kva”,kva);
联系方式。put(“pf”,pf);
//将联系人添加到联系人列表
联系人列表。添加(联系人);
}
}捕获(最终JSONException e){
Log.e(标记“Json解析错误:”+e.getMessage());
Log.e(“JSON解析器”,“错误解析数据”+e.toString());
runOnUiThread(新的Runnable(){
@凌驾
公开募捐{
Toast.makeText(getApplicationContext(),
Json分析错误:“+e.getMessage(),
吐司长度(长)
.show();
}
});
}
}否则{
e(标记“无法从服务器获取json”);
runOnUiThread(新的Runnable(){
@凌驾
公开募捐{
Toast.makeText(getApplicationContext(),
“无法从服务器获取json。请检查LogCat以了解可能的错误!”,
吐司长度(长)
.show();
}
});
}
返回null;
}
@凌驾
受保护的void onPostExecute(void结果){
super.onPostExecute(结果);
//关闭进度对话框
if(pDialog.isShowing())
pDialog.disclose();
/**
*将解析的JSON数据更新到ListView中
* */
ListAdapter=新的SimpleAdapter(
MainActivity.this,联系人列表,
R.layout.list_项,新字符串[]{“kw”,“kva”,
“pf”},新的int[]{R.id.kw,
R.id.kva,R.id.pf});
低压设置适配器(适配器);
}
}
}
我试过在StackOverflow中查看其他类似的答案,但没有找到。非常感谢你的帮助。谢谢正如消息所说,您正在尝试将JSON数组强制转换为JSON对象。您的JSON是一个数组…请更改GetContacts.doInBackground中的代码
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("contacts");
到
contacts
Json键未出现在您发布的Json示例上,请提供完整的Json示例。可能与
JSONArray contacts = new JSONArray(jsonStr);