Android JSON obtenir les données à partir de PHP

Quelqu'un a une idée de ce que je fais de mal? J'ai essayé de faire juste au sujet de chaque exemple là-bas. Je veux juste la lat et lon coords à partir du serveur à l'aide de php sur mon téléphone android.

Je vous remercie pour votre aide dans l'avancée

C'est la partie de mon code qui je vais avoir des problèmes avec:

public void connect()
{
    StrictMode.ThreadPolicy policy = new   
    StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);

    HttpClient httpclient = new DefaultHttpClient();

    //Prepare a request object
    HttpGet httpget = new HttpGet("SERVER URL"); 

    //Execute the request
    HttpResponse response;
    try {
        response = httpclient.execute(httpget);
        //Examine the response status
        //Log.i("Info",response.getStatusLine().toString());  Comes back with HTTP/1.1 200 OK

        //Get hold of the response entity
        HttpEntity entity = response.getEntity();

        if (entity != null) {
            InputStream instream = entity.getContent();
            String result= convertStreamToString(instream);

            JSONArray arr = new JSONArray(result);
            JSONObject jObj = arr.getJSONObject(0);
            String lat = jObj.getString("Lat");
            Log.d("OutPut", jObj.getString("Lon"));
            Toast.makeText(this, lat, Toast.LENGTH_LONG).show();
            instream.close();
        }


    } catch (Exception e) {
        Log.e("Error",e.toString());
    }
}

Je ne peux pas obtenir les données de la JSONObject. Je reçois cette exception.

03-31 17:23:41.457: E/Error(317): org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONArray

Le code PHP de mon serveur est sortie:

[{"Lat":"47.9255072","Lon":"-97.0846979","id":"34"}]

Voici tout le code dans mon MainActivity

package com.misterbusllc.misterbusllc;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import android.os.Bundle;
import android.os.StrictMode;
import android.content.Intent;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.Menu;
import android.widget.SlidingDrawer;
import android.widget.SlidingDrawer.OnDrawerCloseListener;
import android.widget.SlidingDrawer.OnDrawerOpenListener;
import android.widget.Toast;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
connect();
//contactServer();
final SlidingDrawer slidingDrawerCost = (SlidingDrawer) findViewById(R.id.slidingDrawerCost);
final SlidingDrawer slidingDrawerInfo = (SlidingDrawer) findViewById(R.id.slidingDrawerInfo);
GoogleMap map = ((SupportMapFragment)  getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
LatLng latLng = new LatLng(47.922612,-97.060776);
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
map.addMarker(new MarkerOptions().position(latLng).title("MisterBus").snippet("MisterBus is currently here").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
map.getUiSettings().setCompassEnabled(true);
map.getUiSettings().setZoomControlsEnabled(true);
map.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 10));
slidingDrawerCost.setOnDrawerOpenListener(new OnDrawerOpenListener() {
@Override
public void onDrawerOpened() {
Intent intent = new Intent(getApplicationContext(), Cost.class);
startActivity(intent);
}
});
slidingDrawerCost.setOnDrawerCloseListener(new OnDrawerCloseListener() {
@Override
public void onDrawerClosed() {
slidingDrawerCost.close();
}
}); 
slidingDrawerInfo.setOnDrawerOpenListener(new OnDrawerOpenListener() {
@Override
public void onDrawerOpened() {
Intent intent = new Intent(getApplicationContext(), info.class);
startActivity(intent);
}
});
slidingDrawerInfo.setOnDrawerCloseListener(new OnDrawerCloseListener() {
@Override
public void onDrawerClosed() {
slidingDrawerInfo.close();
}
}); 
}
@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;
}
public void connect()
{
StrictMode.ThreadPolicy policy = new   
StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
HttpClient httpclient = new DefaultHttpClient();
//Prepare a request object
HttpGet httpget = new HttpGet("SERVER URL"); 
//Execute the request
HttpResponse response;
try {
response = httpclient.execute(httpget);
//Examine the response status
//Log.i("Info",response.getStatusLine().toString());  Comes back with HTTP/1.1 200 OK
//Get hold of the response entity
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream instream = entity.getContent();
String result= convertStreamToString(instream);
JSONArray arr = new JSONArray(result);
JSONObject jObj = arr.getJSONObject(0);
String lat = jObj.getString("Lat");
Log.d("OutPut", jObj.getString("Lon"));
Toast.makeText(this, lat, Toast.LENGTH_LONG).show();
instream.close();
}
} catch (Exception e) {
Log.e("Error",e.toString());
}
}
private static String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the BufferedReader.readLine()
* method. We iterate until the BufferedReader return null which means
* there's no more data to read. Each line will appended to a StringBuilder
* and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}//end of class

CODE PHP:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset=utf-8" http-equiv="Content-Type" content="application/json"; />
<title>Gps Send</title>
</head>
<body>
<?php
header('Content-type: application/json');
mysql_connect("localhost", "root","password"); 
mysql_select_db("misterbus");
$last =mysql_query("SELECT * FROM location WHERE ID = (SELECT MAX(id)  FROM location)");
while($row=mysql_fetch_assoc($last))
$output[]=$row;
print(json_encode($output));
mysql_close();
?>
</body>
</html>