PHP的Android JSON解析错误

Question

我得到这个错误

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

我不能决定在哪里这个错误就要形式我认为这将是PHP的，但是当我从不同的页面得到的JSON它的工作原理细所以我不知道错误是来自

到来，这是PHP页面

include("database.php"); 

$state = $_GET['state']; 
$response["county"] = array(); 
switch ($state){ 
case "Select A State": 

    break; 
default: 
    $squery = $con->prepare("SELECT * FROM states WHERE fullName = :state"); 
    $squery->bindParam(':state', $state, PDO::PARAM_STR); 
    $squery->execute(); 
    $srow = $squery->fetch(PDO::FETCH_ASSOC); 

    $tb = trim($srow['tbName']); 
    $query = $con->prepare("SELECT DISTINCT(County) FROM `$tb` ORDER BY County ASC"); 
    $query->execute(); 

    while ($row = $query->fetch(PDO::FETCH_ASSOC)){ 
     $temp = array("display"=>$row['County']); 
     array_push($response["county"], $temp); 
     unset($temp); 
    } 
    break; 
} 
print json_encode($response); 

这是我的java代码

package com.photosbychristian.ems; 

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

import org.apache.http.NameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import android.app.Activity; 
import android.app.ProgressDialog; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Spinner; 
import android.widget.TabHost; 
import android.widget.TabHost.TabSpec; 

public class Edit extends Activity { 

private ProgressDialog stateDialog; 
private ProgressDialog countyDialog; 
private ProgressDialog cityDialog; 

JSONParser stateParser = new JSONParser(); 
JSONParser countyParser = new JSONParser(); 
JSONParser cityParser = new JSONParser(); 

private static String url_state = "http://www.photosbychristian.com/ems/states.php"; 
private String url_county = "http://www.photosbychristian.com/ems/countys.php?state=Pennsylvania"; 
private static String url_city = "http://www.photosbychristian.com/ems/states.php"; 

private static final String TAG_STATE_DISPLAY = "display"; 
private static final String TAG_COUNTY_DISPLAY = "display"; 

JSONArray statesArray = null; 
JSONArray countysArray = null; 
JSONArray citysArray = null; 

ArrayAdapter<String> stateAdapter; 
ArrayAdapter<String> countyAdapter; 
ArrayAdapter<String> cityAdapter; 

Spinner state; 
Spinner county; 
Spinner city; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.edit); 

    TabHost th = (TabHost) findViewById(R.id.tabhost); 
    th.setup(); 
    TabSpec specs = th.newTabSpec("tag1"); 
    specs.setContent(R.id.tab1); 
    specs.setIndicator("My Hospitals"); 
    th.addTab(specs); 
    specs = th.newTabSpec("tag2"); 
    specs.setContent(R.id.tab2); 
    specs.setIndicator("Add Hospitals"); 
    th.addTab(specs); 
    new LoadStates().execute(); 

    state = (Spinner) findViewById(R.id.sState); 
    county = (Spinner) findViewById(R.id.sCounty); 
    city = (Spinner) findViewById(R.id.sCity); 

    stateAdapter = new ArrayAdapter<String>(this, 
      android.R.layout.simple_spinner_item); 
    countyAdapter = new ArrayAdapter<String>(this, 
      android.R.layout.simple_spinner_item); 
    cityAdapter = new ArrayAdapter<String>(this, 
      android.R.layout.simple_spinner_item); 

} 

class LoadStates extends AsyncTask<String, String, String> { 

    // Before starting background thread Show State Progress Dialog 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     stateDialog = new ProgressDialog(Edit.this); 
     stateDialog.setMessage("Loading States. Please wait..."); 
     stateDialog.setIndeterminate(false); 
     stateDialog.setCancelable(false); 
     stateDialog.show(); 
    } 

    /** Get states form Internet **/ 

    protected String doInBackground(String... args) { 
     // Building Parameters 
     List<NameValuePair> params = new ArrayList<NameValuePair>(); 
     // getting JSON string from URL 
     JSONObject json = stateParser.makeHttpRequest(url_county, "GET", 
       params); 

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

     stateAdapter 
       .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     stateAdapter.add("Select A State"); 
     try { 
      // products found 
      // Getting Array of Products 
      statesArray = json.getJSONArray("state"); 

      // looping through All Products 
      for (int i = 0; i < statesArray.length(); i++) { 
       JSONObject c = statesArray.getJSONObject(i); 

       // Storing each JSON item in variable 
       // String id = c.getString(TAG_HID); 
       String disp = c.getString(TAG_STATE_DISPLAY); 

       stateAdapter.add(disp); 

      } 

     } 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 
     stateDialog.dismiss(); 
     // updating UI from Background Thread 
     runOnUiThread(new Runnable() { 
      public void run() { 
       // add states to spinner 
       state.setAdapter(stateAdapter); 

      } 
     }); 

     state.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
      public void onItemSelected(AdapterView<?> parent, View view, 
        int position, long id) { 
       // On selecting a spinner item 
       String label = parent.getItemAtPosition(position) 
         .toString(); 
       if (label == "Select A State") { 

       } else { 
        url_county = "http://www.photosbychristian.com/ems/countys.php?state=" 
          + label; 
        Log.d("url", url_county); 
        // load county spinner 

        new LoadCounty().execute(); 
       } 
      } 

      public void onNothingSelected(AdapterView<?> arg0) { 
       // TODO Auto-generated method stub 

      } 
     }); 
    } 
} 
} 

完整的堆栈跟踪

02-27 21:28:58.527: E/JSON Parser(1782): Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject 
02-27 21:28:58.527: W/Trace(1782): Unexpected value from nativeGetEnabledTags: 0 
02-27 21:28:58.527: W/Trace(1782): Unexpected value from nativeGetEnabledTags: 0 
02-27 21:28:58.547: W/Trace(1782): Unexpected value from nativeGetEnabledTags: 0 
02-27 21:28:58.547: W/Trace(1782): Unexpected value from nativeGetEnabledTags: 0 
02-27 21:28:58.577: W/dalvikvm(1782): threadid=11: thread exiting with uncaught exception (group=0x40a70930) 
02-27 21:28:58.587: E/AndroidRuntime(1782): FATAL EXCEPTION: AsyncTask #1 
02-27 21:28:58.587: E/AndroidRuntime(1782): java.lang.RuntimeException: An error occured while executing doInBackground() 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at android.os.AsyncTask$3.done(AsyncTask.java:299) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at java.util.concurrent.FutureTask.run(FutureTask.java:239) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at java.lang.Thread.run(Thread.java:856) 
02-27 21:28:58.587: E/AndroidRuntime(1782): Caused by: java.lang.NullPointerException 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at com.photosbychristian.ems.Edit$LoadStates.doInBackground(Edit.java:106) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at com.photosbychristian.ems.Edit$LoadStates.doInBackground(Edit.java:1) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at android.os.AsyncTask$2.call(AsyncTask.java:287) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  at java.util.concurrent.FutureTask.run(FutureTask.java:234) 
02-27 21:28:58.587: E/AndroidRuntime(1782):  ... 4 more 

Answer 1

你执行与空PARAMS查询，让您的网址http://www.photosbychristian.com/ems/countys.php?state=Pennsylvania实际上将变成http://www.photosbychristian.com/ems/countys.php?state=Pennsylvania?返回 -

<br /> 
<b>Fatal error</b>: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax error or access violation: 1103 Incorrect table name ''' in /home/content/03/8587103/html/ems/countys.php:18 
Stack trace: 
#0 /home/content/03/8587103/html/ems/countys.php(18): PDOStatement-&gt;execute() 
#1 {main} 
    thrown in <b>/home/content/03/8587103/html/ems/countys.php</b> on line <b>18</b><br  /> 

要解决，做到以下几点：

protected String doInBackground(String... args) { 
    // Building Parameters 
    List<NameValuePair> params = new ArrayList<NameValuePair>(); 
    params.add(new BasicNameValuePair("state", "Pennsylvania")); 
    // getting JSON string from URL 
    String url = "http://www.photosbychristian.com/ems/countys.php"; 
    JSONObject json = stateParser.makeHttpRequest(url, "GET", 
      params); 

Answer 2

<br听起来像是你有一些HTML重整JSON字符串。转储出原始的json字符串，并且您可能会发现其中嵌入了PHP错误，从而导致json语法错误。例如你receving

<br />Warning: blah blah blah 
[your json object here]