java - json解析错误

Question

当我运行我的应用程序时，出现以下错误，并且 ADV 中显示空白页面。这是我在解析输入时遇到的问题:

Error parsing data org.json.JSONException: Value You of type java.lang.String cannot be converted to JSONObject.

如果我能得到一些帮助，我将不胜感激。

类 ListQuest.java

           public class ListQuest extends ListActivity {

// Progress Dialog
private ProgressDialog pDialog;

// Creating JSON Parser object
JSONParser jParser = new JSONParser();

          ArrayList<HashMap<String, String>> questsList = 
         new ArrayList<HashMap<String, String>>();

              // url to get all products list
                 private static String url_all_quests = 
                      "http://10.0.2.2/android_connect/listquest.php";

// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_QUEST = "Question";
private static final String TAG_REP = "Reponse";
private static final String TAG_IDE = "idenq";
private static final String TAG_IDQ = "idquest";
private static final String TAG_LIBQ = "libquest";
private static final String TAG_LIBR = "librep";


// products JSONArray

String idenq;
String idquest;
String libquest,librep;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list_quest);
    Intent i = getIntent();
    idenq = i.getStringExtra(TAG_IDE);
    idquest = i.getStringExtra(TAG_IDQ);


    final CheckBox checkBox = (CheckBox) findViewById(R.id.chkIos);

    // Hashmap for ListView
    questsList = new ArrayList<HashMap<String, String>>();

    // Loading products in Background Thread
    new LoadAllProducts().execute();

    // Get listview
    ListView lv = getListView();

    // on seleting single product
    // launching Edit Product Screen
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem
    String idquest = ((TextView) view.findViewById(R.id.idquest)).getText()
                    .toString();

            // Starting new intent
            Intent in = new Intent(getApplicationContext(),
                    test.class);
            // sending pid to next activity
            in.putExtra(TAG_IDQ, idquest);

            // starting new activity and expecting some response back
            startActivityForResult(in, 100);
        }
    });

}

// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    // if result code 100
    if (resultCode == 100) {
        // if result code 100 is received 
        // means user edited/deleted product
        // reload this screen again
        Intent intent = getIntent();
        finish();
        startActivity(intent);
    }

}

/**
 * Background Async Task to Load all product by making HTTP Request
 * */
class LoadAllProducts extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(ListQuest.this);
        pDialog.setMessage("Loading products. Please wait...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * getting All products from url
     * */
    protected String doInBackground(String... args) {
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("idenq", idenq));
        params.add(new BasicNameValuePair("idquest", idquest));

        params.add(new BasicNameValuePair("libquest", libquest));

        params.add(new BasicNameValuePair("librep", librep));
        // getting JSON string from URL
    JSONObject json = jParser.makeHttpRequest(url_all_quests, "GET", params);

        // Check your log cat for JSON reponse
        Log.d("All Products: ", json.toString());

        try {




                // products found
                // Getting Array of Products
                JSONArray  Question = json.getJSONArray(TAG_QUEST);

                // looping through All Products
                for (int i = 0; i < Question.length(); i++) {


                    // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();
                    // Storing each json item in variable
                    JSONObject c=Question.getJSONObject(i);
                    String libquest = c.getString(TAG_LIBQ);
                    JSONArray Reponse =c.getJSONArray(TAG_REP);


                    map.put(TAG_LIBQ, libquest);

                    // adding HashList to ArrayList

                    // looping through All Products

                    for (int k =0 ; k < Reponse.length(); k++) {
                        HashMap<String, String> map1 = new
                        HashMap<String, String>();
            JSONObject r=Reponse.getJSONObject(k);
                String librep = r.getString(TAG_LIBR);
                        map.put(TAG_LIBR, librep);

                    }
                    questsList.add(map);
                }


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

        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog after getting all products
        pDialog.dismiss();
        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
            public void run() {
                /**     
                 * Updating parsed JSON data into ListView
                 * */


                ListAdapter adapter = new SimpleAdapter(
                        ListQuest.this, questsList,
                        R.layout.list_quest, new String[] { 
                                TAG_LIBQ,TAG_LIBR},
                        new int[] {  R.id.libquest ,
                                         R.id.librep});
                // updating listview
                setListAdapter(adapter);



            }
        });

    }

}

}

JsonParser 类

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {

    }

    // function get json from url
    // by making HTTP POST or GET mehtod
    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().substring(0, sb.toString().length()-1);
        } 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;

    }
}

结果是:

        {"Question":[{"idquest":"17","libquest":"avez vous visité 
                       tunis?","Reponse":[{"librep":"oui"},{"librep":"non"}]},
             {"idquest":"50","libquest":"quel est votre       spécialité","Reponse":  
              [{"librep":"MP"},{"librep":"PC"}]},{"idquest":"51","libquest":"quel est 
                       votre équipe préféré","Reponse":[]}]}

Answer 1

很可能你正在解析的字符串不是你想象的那样，而且实际上不是 json。我猜想这是某种以“你”一词开头的消息。