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Я хочу получить все данные из базы данных, но есть ошибка компиляции, и я новичок в android. Это мой класс, в котором я хочу получить всех пользователей из таблицы и показать там имя в списке. Если имени нет, то имя пользователя будет именем. Ошибка, которую я получаю, не доступна.Как получить JSon с сервера в ListView?
package com.gmakerorganisation.glocator.Fragments;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import com.android.volley.RequestQueue;
import com.gmakerorganisation.glocator.Config;
import com.gmakerorganisation.glocator.GetAllUsers;
import com.gmakerorganisation.glocator.R;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class Sendrequest extends Fragment {
private RequestQueue requestQueue;
ArrayList<HashMap<String, String>> UserList;
private static final String TAG_ID = "id";
private static final String TAG_USERNAME = "username";
private static final String TAG_NAME = "name";
private static final String TAG_PHONE = "phone";
private static final String TAG_PROFILE = "profile";
ListView listView;
public Sendrequest() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v=inflater.inflate(R.layout.fragment_sendrequest, container, false);
listView=(ListView)v.findViewById(R.id.list);
new GetStudents().execute();
return v;
}
private class GetStudents extends AsyncTask<Void, Void, Void> {
// Hashmap for ListView
ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
GetAllUsers webreq = new GetAllUsers();
// Making a request to url and getting response
String jsonStr = webreq.makeWebServiceCall(Config.USERS_URL, GetAllUsers.GET);
Log.d("Response: ", "> " + jsonStr);
UserList = ParseJSON(jsonStr);
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
/**
* Updating parsed JSON data into ListView
li * */
ListAdapter adapter = new SimpleAdapter(
getActivity().getApplicationContext(), UserList,
R.layout.list_item, new String[]{TAG_NAME, TAG_PHONE}, new int[]{R.id.name,
R.id.mobile});
listView.setAdapter(adapter);
}
}
private ArrayList<HashMap<String, String>> ParseJSON(String json) {
if (json != null) {
try {
// Hashmap for ListView
ArrayList<HashMap<String, String>> studentList = new ArrayList<HashMap<String, String>>();
JSONObject jsonObj = new JSONObject(json);
// Getting JSON Array node
JSONArray userrs = jsonObj.getJSONArray(null);
// looping through All Students
for (int i = 0; i < userrs.length(); i++) {
JSONObject c = userrs.getJSONObject(i);
String id = c.getString(TAG_ID);
String username = c.getString(TAG_USERNAME);
String name = c.getString(TAG_NAME);
String phone = c.getString(TAG_PHONE);
String profile = c.getString(TAG_PROFILE);
// tmp hashmap for single student
HashMap<String, String> user = new HashMap<String, String>();
// adding each child node to HashMap key => value
user.put(TAG_ID, id);
user.put(TAG_USERNAME, username);
user.put(TAG_NAME, name);
user.put(TAG_PHONE, phone);
user.put(TAG_PROFILE, profile);
// adding student to students list
studentList.add(user);
}
return studentList;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
return null;
}
}
}
класс GetAllUser
package com.gmakerorganisation.glocator;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import javax.net.ssl.HttpsURLConnection;
/**
* Created by user on 14-07-2016.
*/
public class GetAllUsers {
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
//Constructor with no parameter
public GetAllUsers() {
}
/**
* Making web service call
*
* @url - url to make request
* @requestmethod - http request method
*/
public String makeWebServiceCall(String url, int requestmethod) {
return this.makeWebServiceCall(url, requestmethod, null);
}
/**
* Making service call
*
* @url - url to make request
* @requestmethod - http request method
* @params - http request params
*/
public String makeWebServiceCall(String urladdress, int requestmethod,
HashMap<String, String> params) {
URL url;
String response = "";
try {
url = new URL(urladdress);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(15000);
conn.setConnectTimeout(15000);
conn.setDoInput(true);
conn.setDoOutput(true);
if (requestmethod == POST) {
conn.setRequestMethod("POST");
} else if (requestmethod == GET) {
conn.setRequestMethod("GET");
}
if (params != null) {
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
StringBuilder result = new StringBuilder();
boolean first = true;
for (Map.Entry<String, String> entry : params.entrySet()) {
if (first)
first = false;
else
result.append("&");
result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
result.append("=");
result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
}
writer.write(result.toString());
writer.flush();
writer.close();
os.close();
}
int responseCode = conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
String line;
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((line = br.readLine()) != null) {
response += line;
}
} else {
response = "";
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}
}
Мой исходный PHP код
<?php
//If a post request is detected
if($_SERVER['REQUEST_METHOD']=='POST'){
//Importing the dbConnect script
require_once('conn.php');
$users = array();
$sql = "SELECT id , username, name, phone, profile FROM glocator";
$result = mysqli_query($con,$sql);
if (mysqli_num_rows($result)>0) {
while ($row =mysqli_fetch_array($result)) {
$users['id'] = $row['id'];
$users['username'] = $row['username'];
$users['name'] = $row['name'];
$users['phone'] = $row['phone'];
$users['profile'] = $row['profile'];
echo json_encode($users);
}
}
//Closing the database
mysqli_close($con);
}
?>
И я использую почтальона так, когда я отправить запрос пост дает Эти данные
{"id":"1","username":"gmaker","name":"SHUBHAM SHARMA","phone":"9711979977","profile":"http:\/\/glocator.esy.es\/profilepicture\/1."}{"id":"4","username":"somnath","name":"","phone":"9582223881","profile":""}{"id":"7","username":"shitij","name":"","phone":"9650154839","profile":""}
Какая ваша ошибка? – Jas
Ваша неправильная структура json – Jas
json wrong. скопируйте и вставьте json здесь http://jsonprettyprint.com/ –