I want to get data from MySQL database using PHP and display it in Android activity. I code it and pass JSON Array but there is a problem i dont know how to connect to server and my all database is on local server. I code it Kindly tell me where i go wrong so I can get exact results. I'll be very thankful to you.

My PHP code is:

<?php
$response = array();

require_once __DIR__ . '/db_connect.php';
$db = new DB_CONNECT();
if (isset($_GET["cid"])) {
    $cid = $_GET['cid'];

    // get a product from products table
    $result = mysql_query("SELECT *FROM my_task WHERE cid = $cid");

    if (!empty($result)) {
        // check for empty result
        if (mysql_num_rows($result) > 0) {

            $result = mysql_fetch_array($result);

            $task = array();
            $task["cid"] = $result["cid"];
            $task["cus_name"] = $result["cus_name"];
            $task["contact_number"] = $result["contact_number"];
            $task["ticket_no"] = $result["ticket_no"];
            $task["task_detail"] = $result["task_detail"];

            // success
            $response["success"] = 1;

            // user node
            $response["task"] = array();

            array_push($response["my_task"], $task);

            // echoing JSON response
            echo json_encode($response);
        } else {
            // no task found
            $response["success"] = 0;
            $response["message"] = "No product found";

            // echo no users JSON
            echo json_encode($response);
        }
    } else {
        // no task found
        $response["success"] = 0;
        $response["message"] = "No product found";
        echo json_encode($response);    }
} else {
       $response["success"] = 0;
    $response["message"] = "Required field(s) is missing";
     // echoing JSON response
    echo json_encode($response);}

?>

My Android code is:

 public class My_Task extends Activity {

        TextView cus_name_txt, contact_no_txt, ticket_no_txt, task_detail_txt;
        EditText attend_by_txtbx, cus_name_txtbx, contact_no_txtbx, ticket_no_txtbx, task_detail_txtbx;
        Button btnSave;
        Button btnDelete;

    String cid;

    // Progress Dialog
    private ProgressDialog tDialog;

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

    ArrayList<HashMap<String, String>> my_taskList;


 // single task url
    private static final String url_read_mytask = "http://198.168.0.29/mobile/read_My_Task.php";

    // url to update product
    private static final String url_update_mytask = "http://198.168.0.29/mobile/update_mytask.php";

 // url to delete product
    private static final String url_delete_mytask = "http://198.168.0.29/mobile/delete_mytask.php";

 // JSON Node names
    private static String TAG_SUCCESS = "success";
    private static String TAG_MYTASK = "my_task";
    private static String TAG_CID = "cid";
    private static String TAG_NAME = "cus_name";
    private static String TAG_CONTACT    = "contact_number";
    private static String TAG_TICKET = "ticket_no";
    private static String TAG_TASKDETAIL = "task_detail";
    private static String attend_by_txt;

    // task JSONArray
    JSONArray my_task = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_task);


        cus_name_txt = (TextView) findViewById(R.id.cus_name_txt);

        contact_no_txt = (TextView)findViewById(R.id.contact_no_txt);

        ticket_no_txt = (TextView)findViewById(R.id.ticket_no_txt);

        task_detail_txt = (TextView)findViewById(R.id.task_detail_txt);

        attend_by_txtbx = (EditText)findViewById(R.id.attend_by_txt);
        attend_by_txtbx.setText(My_Task.attend_by_txt);


        Spinner severity = (Spinner) findViewById(R.id.severity_spinner);
        // Create an ArrayAdapter using the string array and a default spinner layout
        ArrayAdapter<CharSequence> adapter3 = ArrayAdapter.createFromResource(this,
                R.array.Severity_array, android.R.layout.simple_dropdown_item_1line);
        // Specify the layout to use when the list of choices appears
        adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        severity.setAdapter(adapter3);


        // save button
        btnSave = (Button) findViewById(R.id.btnSave);
        btnDelete = (Button) findViewById(R.id.btnDelete);

        // getting product details from intent
        Intent i = getIntent();

        // getting product id (pid) from intent
        cid = i.getStringExtra(TAG_CID);

        // Getting complete product details in background thread
        new GetProductDetails().execute();

        // save button click event
        btnSave.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // starting background task to update product
                new SaveProductDetails().execute();
            }
        });

        // Delete button click event
        btnDelete.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // deleting product in background thread
                new DeleteProduct().execute();
            }
        });

    }

    /**
     * Background Async Task to Get complete product details
     * */
    class GetProductDetails extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            tDialog = new ProgressDialog(My_Task.this);
            tDialog.setMessage("Loading task details. Please wait...");
            tDialog.setIndeterminate(false);
            tDialog.setCancelable(true);
            tDialog.show();
        }

        /**
         * Getting product details in background thread
         * */

        protected String doInBackground(String... params) {

            // updating UI from Background Thread
            runOnUiThread(new Runnable() {
                public void run() {
                    // Check for success tag
                    int success;
                    try {
                        // Building Parameters
                        List<NameValuePair> params = new ArrayList<NameValuePair>();
                        params.add(new BasicNameValuePair("cid", cid));

                        // getting product details by making HTTP request
                        // Note that product details url will use GET request
                        JSONObject json = JSONParser.makeHttpRequest(
                                url_read_mytask, "GET", params);

                        // check your log for json response
                        Log.d("Single Task Details", json.toString());

                        // json success tag
                        success = json.getInt(TAG_SUCCESS);
                        if (success == 1) {
                            // successfully received product details
                            JSONArray my_taskObj = json
                                    .getJSONArray(TAG_MYTASK); // JSON Array

                            // get first product object from JSON Array
                            JSONObject my_task = my_taskObj.getJSONObject(0);

                            // task with this cid found
                            // Edit Text
                         // display task data in EditText

                            cus_name_txtbx = (EditText) findViewById(R.id.cus_name_txt);
                            cus_name_txtbx.setText(my_task.getString(TAG_NAME));

                            contact_no_txtbx = (EditText) findViewById(R.id.contact_no_txt);
                            contact_no_txtbx.setText(my_task.getString(TAG_CONTACT));

                            ticket_no_txtbx = (EditText) findViewById(R.id.ticket_no_txt);
                            ticket_no_txtbx.setText(my_task.getString(TAG_TICKET));

                            task_detail_txtbx = (EditText) findViewById(R.id.task_detail_txt);
                            task_detail_txtbx.setText(my_task.getString(TAG_TASKDETAIL));

                        }
                        else
                        {
                            // task with cid not found
                        }
                    } 
                    catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            });

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once got all details
            tDialog.dismiss();
        }
    }

    /**
     * Background Async Task to  Save product Details
     * */
    class SaveProductDetails extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            tDialog = new ProgressDialog(My_Task.this);
            tDialog.setMessage("Saving task ...");
            tDialog.setIndeterminate(false);
            tDialog.setCancelable(true);
            tDialog.show();
        }

        /**
         * Saving product
         * */
        protected String doInBackground(String... args) {

            // getting updated data from EditTexts
            String cus_name = cus_name_txt.getText().toString();
            String contact_no = contact_no_txt.getText().toString();
            String ticket_no = ticket_no_txt.getText().toString();
            String task_detail = task_detail_txt.getText().toString();

            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair(TAG_CID, cid));
            params.add(new BasicNameValuePair(TAG_NAME, cus_name));
            params.add(new BasicNameValuePair(TAG_CONTACT, contact_no));
            params.add(new BasicNameValuePair(TAG_TICKET, ticket_no));
            params.add(new BasicNameValuePair(TAG_TASKDETAIL, task_detail));

            // sending modified data through http request
            // Notice that update product url accepts POST method
            JSONObject json = JSONParser.makeHttpRequest(url_update_mytask,
                    "POST", params);

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

                if (success == 1) {
                    // successfully updated
                    Intent i = getIntent();
                    // send result code 100 to notify about product update
                    setResult(100, i);
                    finish();
                } else {
                    // failed to update product
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once product uupdated
            tDialog.dismiss();
        }
    }

    /*****************************************************************
     * Background Async Task to Delete Product
     * */
    class DeleteProduct extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            tDialog = new ProgressDialog(My_Task.this);
            tDialog.setMessage("Deleting Product...");
            tDialog.setIndeterminate(false);
            tDialog.setCancelable(true);
            tDialog.show();
        }

        /**
         * Deleting product
         * */
        protected String doInBackground(String... args) {

            // Check for success tag
            int success;
            try {
                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("cid", cid));

                // getting product details by making HTTP request
                JSONObject json = JSONParser.makeHttpRequest(
                        url_delete_mytask, "POST", params);

                // check your log for json response
                Log.d("Delete Task", json.toString());

                // json success tag
                success = json.getInt(TAG_SUCCESS);
                if (success == 1) {
                    // product successfully deleted
                    // notify previous activity by sending code 100
                    Intent i = getIntent();
                    // send result code 100 to notify about product deletion
                    setResult(100, i);
                    finish();
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once product deleted
            tDialog.dismiss();

        }

    }


    public void onItemSelected(AdapterView<?> parent, View view, 
            int pos, long id) {
        // An item was selected. You can retrieve the selected item using
        // parent.getItemAtPosition(pos)
    }

    public void onNothingSelected(AdapterView<?> parent) {
        // Another interface callback
    }    

}

My JSONParser code is:

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 static 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();
    } 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;

my all database is in localhost and it is not opening an activity. displays an error "Stopped unexpectedly":( How can i get exact results. Kindly guide me