分析org.json类型的数据值时出错.无法将JSONArray转换为JSONObject

运行代码时（在错误消息后给出）将错误作为抛出

编码如下：

 public class Slide extends ActionBarActivity {
 private ProgressDialog pDialog;
 JSONParser jParser = new JSONParser();
 ArrayList<HashMap<String, String>> detailsList;    //Creating a Arraylist
 private static String URL = "URL to my php page";
 private static final String TAG_DETAILS = "details";
 private static final String TAG_TITLE = "title";
 JSONArray details = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_slide);
    new onlineload().execute();             
}
class onlineload extends AsyncTask<String, String, String> 
{
    @Override 
     protected void onPreExecute() 
     { 
     super.onPreExecute(); 
     pDialog = new ProgressDialog(Slide.this); 
     pDialog.setMessage("Fetching Books..."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(true); 
     pDialog.show(); 
     } 

    @Override
    protected String doInBackground(String... arg0) {
        // TODO Auto-generated method stub
         String title = "";
          TextView tvTitle = (TextView)findViewById(R.id.Title);
          List<NameValuePair> params = new ArrayList<NameValuePair>();
          JSONObject json = jParser.makeHttpRequest(URL, "GET", params);
          Log.d("All Products:",json.toString());
          try {
          details = json.getJSONArray(TAG_DETAILS);
          for (int i = 0; i < details.length(); i++) {
          JSONObject c = details.getJSONObject(i);
          title = title + c.getString(TAG_TITLE)+"'n";
          tvTitle.setText(title);
          }
          }
          catch (JSONException e) {
                      e.printStackTrace();
                  }
        return null;
    }
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

上面显示的是我的java代码。。该代码的功能是从在线数据库中获取书名（数据库中有10多本书名），并在滚动视图活动中查看。。

我的php代码正在工作，正在获取输出，只是问题是在android活动中显示它！！

寻求帮助！！

JSON代码：

public class JSONParser {
static InputStream is = null;
static JSONArray jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET method
public JSONArray 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
Log.d("Entered Get", "Get SUccess"+url+method);
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 JSONArray(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}

}