从php解析数据到android列表视图时出错


Error parsing data from php into android list view

我有我的php web服务,从我的论坛中检索主题列表,我使用JSON在我的Android应用程序中将其分成listview。

不幸的是,当运行应用程序时当我进入我应该看到列表的页面时,我得到了黑屏在我的logcat中,我得到了这个错误

03-17 15:00:04.189: E/JSON Parser(379): Error parsing data org.json.JSONException: Value <?xml of type java.lang.String cannot be converted to JSONObject

这里是JSONparser类

package com.example.androidhive.library;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";
    // constructor
    public JSONParser() {
    }
    public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) {
        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "'n");
            }
            is.close();
            json = sb.toString();
            Log.e("JSON", json);
        } catch (Exception e) {
            //Log.e("Buffer Error", "Error converting result " + e.toString());
        }
        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);            
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }       
        // return JSON String
        return jObj;
    }
     public JSONObject makeHttpRequest(String url, String method,
            List<NameValuePair> params) {
        // Making HTTP request
        try {
            // check for request method
            if(method == "POST"){
            // request method is POST
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
            }else if(method == "GET"){
            // request method is GET
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(params, "utf-8");
            url += "?" + paramString;
            HttpGet httpGet = new HttpGet(url);
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
            }           
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
            sb.append(line + "'n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }
        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }
        // return JSON String
        return jObj;
        }

}

我有两个公共JSONobject第一个我为用户注册。第一个是登录,第二个是主题列表视图,我假设错误来自

这是php

        <?php
/*
 * Following code will list all the products
 */
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . 'DB_Connect.php';
// connecting to db
$db = new DB_CONNECT();
// get all products from products table
if(isset($_GET['parent']))
{
    $id = intval($_GET['parent']);}
$result = mysql_query("select t.id, t.title, u.username as author,  from topics as t  left join user as u where t.parent="'.$id.'" and t.id2=1 group by t.id order by t.timestamp2 desc');
") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
    // looping through all results
    // products node
    $response["topics"] = array();
    while ($row = mysql_fetch_array($result)) {
    // temp user array
    $topic = array();
    $topic["tid"] = $row["t.id"];
    $topic["name"] = $row["t.title"];
    $topic["author"] = $row["u.username"];

    // push single product into final response array
    array_push($response["topics"], $topic);
    echo json_encode($response);
    }
    // success
    $response["success"] = 1;
    // echoing JSON response
    echo json_encode($response);
} else {
    // no products found
    $response["success"] = 0;
    $response["message"] = "No topics found";
    // echo no users JSON
    echo json_encode($response);
}
?>

这是我从服务器

得到的字符串
03-17 16:04:21.599: E/JSON(502): <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
03-17 16:04:21.599: E/JSON(502):   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
03-17 16:04:21.599: E/JSON(502): <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
03-17 16:04:21.599: E/JSON(502): <head>
03-17 16:04:21.599: E/JSON(502): <title>Object not found!</title>
03-17 16:04:21.599: E/JSON(502): <link rev="made" href="mailto:postmaster@localhost" />
03-17 16:04:21.599: E/JSON(502): <style type="text/css"><!--/*--><![CDATA[/*><!--*/ 
03-17 16:04:21.599: E/JSON(502):     body { color: #000000; background-color: #FFFFFF; }
03-17 16:04:21.599: E/JSON(502):     a:link { color: #0000CC; }
03-17 16:04:21.599: E/JSON(502):     p, address {margin-left: 3em;}
03-17 16:04:21.599: E/JSON(502):     span {font-size: smaller;}
03-17 16:04:21.599: E/JSON(502): /*]]>*/--></style>
03-17 16:04:21.599: E/JSON(502): </head>
03-17 16:04:21.599: E/JSON(502): <body>
03-17 16:04:21.599: E/JSON(502): <h1>Object not found!</h1>
03-17 16:04:21.599: E/JSON(502): <p>
03-17 16:04:21.599: E/JSON(502):     The requested URL was not found on this server.
03-17 16:04:21.599: E/JSON(502):   
03-17 16:04:21.599: E/JSON(502):     If you entered the URL manually please check your
03-17 16:04:21.599: E/JSON(502):     spelling and try again.
03-17 16:04:21.599: E/JSON(502):   
03-17 16:04:21.599: E/JSON(502): </p>
03-17 16:04:21.599: E/JSON(502): <p>
03-17 16:04:21.599: E/JSON(502): If you think this is a server error, please contact
03-17 16:04:21.599: E/JSON(502): the <a href="mailto:postmaster@localhost">webmaster</a>.
03-17 16:04:21.599: E/JSON(502): </p>
03-17 16:04:21.599: E/JSON(502): <h2>Error 404</h2>
03-17 16:04:21.599: E/JSON(502): <address>
03-17 16:04:21.599: E/JSON(502):   <a href="/">10.0.2.2</a><br />
03-17 16:04:21.599: E/JSON(502):   <span>Apache/2.4.3 (Win32) OpenSSL/1.0.1c PHP/5.4.7</span>
03-17 16:04:21.599: E/JSON(502): </address>
03-17 16:04:21.599: E/JSON(502): </body>
03-17 16:04:21.599: E/JSON(502): </html>
03-17 16:04:21.599: E/JSON Parser(502): Error parsing data org.json.JSONException: Value <?xml of type java.lang.String cannot be converted to JSONObject

url和从服务器获取数据,参数为

private static String url_all_topics = "http://10.0.2.2/android_login_api/list_of_topics.php";
 // JSON Node names
 private static final String TAG_SUCCESS = "success";
 private static final String TAG_TOPICS = "topics";
 private static final String TAG_TOPICSID = "t.id";
private static final String TAG_TOPICTITLE = "t.title";
private static final String TAG_TOPICAUTHOR = "u.username";

我在一个在线教程中找到了这个,但我编辑它以满足我的要求

我希望你对我有耐心,因为我不是很好,我是新手,想学习

服务器返回HTTP 404错误代码,这意味着您的脚本根本没有运行

验证你在应用程序中访问了正确的URL。