Android 无法分析Json解析器异常

此代码正在打印我的json解析器异常。
在这段代码中，我想向服务器发送纬度，但它会继续显示两个错误：

无法分析Json异常

异步任务#1错误

你能告诉我我做错了什么吗

这是我的相关代码：

             package com.example.gpstracking;


      public class AndroidGPSTrackingActivity extends Activity {

Button btnShowLocation;

String lat = "";
String lng = "";
// GPSTracker class
GPSTracker gps;
private ProgressDialog pDialog;

JSONParser jsonParser = new JSONParser();
// JSONParser jsonParser = new JSONParser();
private static String url_create_product = "http://dyandroidapps.netii.net/"
        + "android_db/DB_Functncreate1.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    btnShowLocation = (Button) findViewById(R.id.btnShowLocation);

    // show location button click event
    btnShowLocation.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // create class object
            gps = new GPSTracker(AndroidGPSTrackingActivity.this);

            // check if GPS enabled
            if (gps.canGetLocation()) {

                double latitude = gps.getLatitude();
                double longitude = gps.getLongitude();
                 lat = Double.toString(latitude);
                 lng = Double.toString(longitude);

                Toast.makeText(
                        getApplicationContext(),
        "Your Location is " + "- \nLat: " +  latitude
            + "\nLong: " + longitude, Toast.LENGTH_LONG)
                        .show();
                new CreateNewProduct().execute();
                // postData(lat, lng);

            } else {
                // can't get location
                // GPS or Network is not enabled
                // Ask user to enable GPS/network in settings
                gps.showSettingsAlert();
            }

        }
    });
}

/*
 * public void postData(String lat, String lng) { // Create a new HttpClient
 * and Post Header HttpClient httpclient = new DefaultHttpClient();
 * 
 * HttpPost httppost = new
 * HttpPost("http://dyandroidappa.netii.net/android_db/create_product.php");
 * 
 * try {
 * 
 * // Execute HTTP Post Request // HttpResponse response =
 * httpclient.execute(htget); HttpResponse response =
 * httpclient.execute(httppost); // String resp =
 * response.getStatusLine().toStrinkatyg(); try this // now //
 * Toast.makeText(this, resp, 5000).show();
 * 
 * } catch (ClientProtocolException e) { Toast.makeText(this, "Error",
 * 5000).show(); } catch (IOException e) { Toast.makeText(this, "Error",
 * 5000).show(); } }
 */

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

    // * Before starting background thread Show Progress Dialog

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(AndroidGPSTrackingActivity.this);
        pDialog.setMessage("Sending markers..");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    // * Creating product

    protected String doInBackground(String... args) {

        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("lat", lat));
        params.add(new BasicNameValuePair("lng", lng));

        // params.add(new BasicNameValuePair("description", description));

        // getting JSON Object
        // Note that create product url accepts POST method
        JSONObject json = jsonParser.makeHttpRequest(url_create_product,
                "POST", params);

        // check log cat from response
        Log.d("Create Response", json.toString());

        // check for success tag
        try {
            int success = json.getInt(TAG_SUCCESS);

            if (success == 1) {
                // successfully created product
                Toast.makeText(getApplicationContext(), "Data Posted",
                        Toast.LENGTH_SHORT).show();

                // closing this screen
                finish();
            } else {
                // failed to create product
                Toast.makeText(getApplicationContext(), "Data not Posted",
                        Toast.LENGTH_SHORT).show();
            }
        } catch (JSONException e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Json Exception",
                    Toast.LENGTH_SHORT).show();
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(), "Only Exception",
                    Toast.LENGTH_SHORT).show();

        }

        return null;
    }

    // After completing background task Dismiss the progress dialog

    protected void onPostExecute(String file_url) {
        // dismiss the dialog once done
        pDialog.cancel();
    }
}

}

---

我不确定，但问题可能在于：

    // Building Parameters
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("lat", lat));
    params.add(new BasicNameValuePair("lng", lng));

因此，这两种情况始终是相同的，正如开头所说：

String lat = "";
String lng = "";

---

除此之外，在131行中还有一个NullPointerException。请发布。

请发布您的实际响应。AndroidGPSTrackingActivity.java中的第131行是什么？响应代码的意思是。。。。。。？我没有其他代码，除了一个是posted谢谢你的评论我没有响应代码请建议我我是android新手，所以，碰巧这些lat，lng没有评论，它是由我评论的，只是为了测试，当它给我空指针异常，然后我来此，传递另一个值，并发布相同的代码，但在实际代码中，它不会被注释。感谢您现在告诉我您能提供更多帮助吗………您需要向我们提供您的代码，从第131行（AndroidGPSTrackingActivity.java:131行）开始，您有一个空指针异常，这意味着您正在访问一些不存在的东西。

package com.example.gpstracking;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

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

        return location;
    }

    /**
     * Stop using GPS listener Calling this function will stop using GPS in your
     * app
     * */
    public void stopUsingGPS() {
        if (locationManager != null) {
            locationManager.removeUpdates(GPSTracker.this);
        }
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude() {
        if (location != null) {
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude() {
        if (location != null) {
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * 
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog On pressing Settings button will
     * lauch Settings Options
     * */
    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog
                .setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent(
                                Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        mContext.startActivity(intent);
                    }
                });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {

    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }



    }

}

    // Building Parameters
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("lat", lat));
    params.add(new BasicNameValuePair("lng", lng));

double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// lat = Double.toString(latitude);
// lng = Double.toString(longitude);

String lat = "";
String lng = "";