drnysdnnb2909701 2015-03-11 16:45
浏览 642
已采纳

JSON错误：java.lang.String无法转换为JSONObject

I'm developing an android app and I'm trying to use Volley Library. The problem that I can't solve is about the JSON. I checked my php file, the result and the Java code but I'm still getting the same error.

The interesting part is that VolleyLog doesn't show an error message but, Log, does. 

E/Volley﹕ [1] 2.onErrorResponse: VOLLEY_ERROR

and 

E/LOG﹕ Error: org.json.JSONException: Value You of type java.lang.String cannot be converted to JSONObject

That's my PHP code:

<?php
# Inform which carachters type will be used.
header('Content-Type: text/html; charset=utf-8');
 // array for JSON response
$response = array();

// include db connect class

require_once ('../conn.php');
require_once('pClass.php');

error_reporting( E_ALL ); 

// connecting to db
$db = new DB_CONNECT();

//Setting to UTF8
mysql_query("SET NAMES 'utf8_general_ci'");
mysql_query('SET character_set_connection=utf8_general_ci');
mysql_query('SET character_set_client=utf8_general_ci');
mysql_query('SET character_set_results=utf8_general_ci');
mysql_query('SET CHARACTER SET utf8');

    $ff_error = "ERROR";
    $arrPOI["arrPOI"] = array();
    $poi=new POI();

if (isset($_REQUEST["ff_01"])) 
{
    //Execute the query
    $ff_01 = $_REQUEST['ff_01'];
    $return = mysql_query($ff_01) or die(mysql_error());

    // check for empty result
    if (mysql_num_rows($return) > 0) {
        while ($row = mysql_fetch_array($return)) {
            $poi->setPOIId($row["intPointId"]);
            $poi->setPOIName($row["vchPointName"]);
            $poi->setPOIImage($row["vchAwesomeFont"]);
            $poi->setStatusId($row["intStatusId"]);
            $poi->setLanguageId($row["intLanguageId"]);

            // push single category into final response array
            array_push($arrPOI["arrPOI"], $poi->getPOIData());
        }
        // echoing JSON response
        header('Content-Type: application/json');
        echo json_encode($arrPOI, JSON_NUMERIC_CHECK | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_UNICODE | JSON_NUMERIC_CHECK | JSON_NUMERIC_CHECK);
    } else {
        //No data found
        array_push($arrPOI["arrPOI"], $poi->getPOIData());

        // echo no users JSON
        header('Content-Type: application/json');
        echo json_encode($arrPOI);
    }
} else {
    //ERROR
    array_push($arrPOI["arrPOI"], $poi->getPOIData());

    //Echo
    header('Content-Type: application/json');
    echo json_encode($arrPOI);
}   
?>

The PHP result:

{"arrPOI":[{"intPOIId":1,"strPOIName":"Cinema","strPOIImage":"fa-film","intStatusId":1,"intLanguageId":1},{"intPOIId":2,"strPOIName":"Teatro","strPOIImage":"fa-smile-o|fa-frown-o","intStatusId":1,"intLanguageId":1},{"intPOIId":3,"strPOIName":"Restaurante","strPOIImage":"fa-cutlery","intStatusId":1,"intLanguageId":1},{"intPOIId":4,"strPOIName":"Bar","strPOIImage":"fa-beer","intStatusId":1,"intLanguageId":1},{"intPOIId":5,"strPOIName":"Pontos Turísticos","strPOIImage":"fa-map-marker","intStatusId":1,"intLanguageId":1},{"intPOIId":6,"strPOIName":"Cafeteria","strPOIImage":"fa-coffee","intStatusId":1,"intLanguageId":1},{"intPOIId":7,"strPOIName":"Shopping","strPOIImage":"fa-diamond","intStatusId":1,"intLanguageId":1},{"intPOIId":8,"strPOIName":"Livraria","strPOIImage":"fa-book","intStatusId":1,"intLanguageId":1},{"intPOIId":9,"strPOIName":"Show","strPOIImage":"fa-microphone","intStatusId":1,"intLanguageId":1},{"intPOIId":10,"strPOIName":"Boates","strPOIImage":"fa-glass","intStatusId":1,"intLanguageId":1},{"intPOIId":11,"strPOIName":"Lanchonete","strPOIImage":"fa-cutlery","intStatusId":1,"intLanguageId":1},{"intPOIId":12,"strPOIName":"Hotéis","strPOIImage":"fa-building","intStatusId":1,"intLanguageId":1},{"intPOIId":13,"strPOIName":"Pub","strPOIImage":"fa-beer","intStatusId":1,"intLanguageId":1},{"intPOIId":14,"strPOIName":"Pizzaria","strPOIImage":"fa-pie-chart","intStatusId":1,"intLanguageId":1},{"intPOIId":15,"strPOIName":"Univesidade","strPOIImage":"fa-university","intStatusId":1,"intLanguageId":1},{"intPOIId":16,"strPOIName":"Hospital","strPOIImage":"fa-plus-square","intStatusId":1,"intLanguageId":1}]}

And my Java Code:

import com.android.volley.NoConnectionError;
import com.android.volley.ServerError;
import com.game.code.guide44.adapter.POIAdapter;
import com.game.code.guide44.app.AppController;
import com.game.code.guide44.data.PointOfInterest;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonObjectRequest;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;

public class POIChoose extends Activity {
    private ListView lVwPOI;
    private POIAdapter adapterPOI;
    private ProgressDialog pDialog;
    private List<PointOfInterest> POIList;
    private String url;
    private StringBuilder stbCheckedPOI;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_poi_choose);
        //Initialize with ListView object from  activity_poi_choose by id
        lVwPOI = (ListView)findViewById(R.id.lvwPOI);
        //Initialize the list of POI
        POIList = new ArrayList<PointOfInterest>();
        //initialize with POI List
        adapterPOI = new POIAdapter(this, POIList);
        //Fill the LiistView with POIAdapter content
        lVwPOI.setAdapter(adapterPOI);
        stbCheckedPOI = new StringBuilder();
        //Base url
        //Change "1" to dynamic user language
        url = getString(R.string.urlBase)+getString(R.string.urlGetPOI)+"?ff_01="+String.format(getString(R.string.sqlSelectPOI), "1");

        //Initialize the ProgressDialog
        pDialog = new ProgressDialog(POIChoose.this);
        //Show the progress bar befores making HTTP request
        pDialog.setMessage(getString(R.string.txtMsgPleaseWait));
        pDialog.show();

        // making fresh volley request and getting json
        JsonObjectRequest jsonReq = new JsonObjectRequest(Method.GET,
                url, null, new Response.Listener<JSONObject>() {

            @Override
            public void onResponse(JSONObject response) {
                VolleyLog.v("VOLLEY", "Response: " + response.toString());
                if (response != null) {
                    parseJsonFeed(response);
                }
            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                if(error instanceof NoConnectionError)
                    Toast.makeText(POIChoose.this, "No internet available", Toast.LENGTH_SHORT).show();
                else if(error instanceof ServerError)
                    Toast.makeText(POIChoose.this, "Server Error", Toast.LENGTH_SHORT).show();

                VolleyLog.e("VOLLEY_ERROR", "Error: " + error.getMessage());
                Log.e("LOG", "Error: " + error.getMessage());
                pDialog.dismiss();
            }
        });

        // Adding request to volley request queue
        AppController.getInstance().addToRequestQueue(jsonReq);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        hidePDialog();
    }

    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }

    private void parseJsonFeed(JSONObject response){
        try{
            JSONArray jsonArray = response.getJSONArray("arrPOI");
                for (int i = 0; i < response.length(); i++) {
                    JSONObject jsonObject = (JSONObject) jsonArray.get(i);
                    PointOfInterest Poi = new PointOfInterest();
                    Poi.setPOIId(jsonObject.getInt("intPointId"));
                    Poi.setPOIName(jsonObject.getString("vchPointName"));
                    Poi.setPOIPicture(jsonObject.getString("vchAwesomeFont"));
                    Poi.setStatusId(jsonObject.getInt("intStatusId"));
                    Poi.setLanguageId(jsonObject.getInt("intLanguageId"));

                    // adding movie to movies array
                    POIList.add(Poi);
                }

        } catch(JSONException e){
            e.printStackTrace();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_first_choose, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void performSelectPOI(View view){
        for(int i = 0; i < POIList.size(); i++)
        {
            if(adapterPOI.mCheckStates.get(i)==true)
            {
                stbCheckedPOI.append(POIList.get(i).toString());
                stbCheckedPOI.append("
");
            }
            else
            {

            }
        }
        Toast.makeText(AppController.getContext(), stbCheckedPOI, Toast.LENGTH_LONG).show();
    }
}

I also heard about GSON. Is it the solution? Can anyone help me? Thanks in advance!!

  • 写回答

1条回答 默认 最新

  • duandianzhong8315 2015-03-15 18:37
    关注

    Well my friends, I tried everything to solve the problem in Java code but I almost forgot to see what my PHP was receiving.

    In this part of my code:

    url = getString(R.string.urlBase)+getString(R.string.urlGetPOI)+"?ff_01="+String.format(getString(R.string.sqlSelectPOI), "1");

    I was passing my SQL query as parameter. Well, the PHP wasn't receiving all query. For example: if I pass 

    "SELECT ID, NAME, ORDER FROM tblOrder"

    my PHP receives only "SELECT", generating an error (obviously!!). So the problem wasn't BOM or UTF-8 or anything like these... Was a basic error.

    So, the solution was put the SQL query inside the PHP and pass only a few parameters to receive the correct answer (in this case, the JSONObject)

    Thanks a lot!!

    P.S.: Thanks to Xjasz! You were right!! I needed to change this:

    Poi.setPOIId(jsonObject.getInt("intPointId"));
Poi.setPOIName(jsonObject.getString("vchPointName"));
Poi.setPOIPicture(jsonObject.getString("vchAwesomeFont"));
Poi.setStatusId(jsonObject.getInt("intStatusId"));
Poi.setLanguageId(jsonObject.getInt("intLanguageId"));

    for this:

    Poi.setPOIId(jsonObject.getInt("intPOIId"));
Poi.setPOIName(jsonObject.getString("strPOIName"));
Poi.setPOIPicture(jsonObject.getString("strPOIImage"));
Poi.setStatusId(jsonObject.getInt("intStatusId"));
Poi.setLanguageId(jsonObject.getInt("intLanguageId"));

    Thanks man!!

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题？

悬赏问题

  • ¥50 STM32单片机传感器读取错误
  • ¥50 power BI 从Mysql服务器导入数据，但连接进去后显示表无数据
  • ¥15 (关键词-阻抗匹配，HFSS，RFID标签)
  • ¥50 sft下载大文阻塞卡死
  • ¥15 机器人轨迹规划相关问题
  • ¥15 word样式右侧翻页键消失
  • ¥15 springboot+vue 集成keycloak sso到阿里云
  • ¥15 win7系统进入桌面过一秒后突然黑屏
  • ¥30 backtrader对于期货交易的现金和资产计算的问题
  • ¥15 求C# .net4.8小报表工具