@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.login_layout);

        usernameEditText = (EditText) findViewById(R.id.id_registered_no);
        passwordEditText = (EditText) findViewById(R.id.id_login_pin);

        sendPostReqButton = (Button)findViewById(R.id.id_login2);
        sendPostReqButton.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {


        if (usernameEditText.getText().length() == 0 || passwordEditText.getText().length() == 0) {
            Toast.makeText(getBaseContext(), "All fields are mandatory ", Toast.LENGTH_LONG).show();
        } else {

            if (v.getId() == R.id.id_login2) {

                dialog = ProgressDialog.show(this, "", " Please wait...", true);

                    String givenUsername = usernameEditText.getEditableText().toString();
                    String givenPassword = passwordEditText.getEditableText().toString();

                    System.out.println("Given username :" + givenUsername + " Given password :" + givenPassword);

                    sendPostRequest(givenUsername, givenPassword);
                }
            }
        }

private void sendPostRequest(String givenUsername, String givenPassword) {

    class SendPostReqAsyncTask extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {

            String paramUsername = params[0];
            String paramPassword = params[1];

            System.out.println("*** doInBackground ** paramUsername " +
                    paramUsername + " paramPassword :" + paramPassword);

            HttpClient httpClient = new DefaultHttpClient();

            HttpPost httpPost = new HttpPost
                    ("http://166.62.50.115:8080/login");


            BasicNameValuePair usernameBasicNameValuePair = new
                    BasicNameValuePair("username", paramUsername);
            BasicNameValuePair passwordBasicNameValuePAir = new
                    BasicNameValuePair("password", paramPassword);


            List<NameValuePair> nameValuePairList = new
                    ArrayList<NameValuePair>();
            nameValuePairList.add(usernameBasicNameValuePair);
            nameValuePairList.add(passwordBasicNameValuePAir);

            try {

                UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(nameValuePairList, HTTP.UTF_8);

                httpPost.setEntity(urlEncodedFormEntity);

                try {

                    HttpResponse httpResponse = httpClient.execute(httpPost);
                    Log.d("Http response", httpResponse.toString());


                    InputStream inputStream = httpResponse.getEntity().getContent();

                    InputStreamReader inputStreamReader = new InputStreamReader(inputStream);

                    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

                    StringBuilder stringBuilder = new StringBuilder();

                    String bufferedStrChunk = null;

                    while((bufferedStrChunk = bufferedReader.readLine()) != null){
                        stringBuilder.append(bufferedStrChunk);
                    }

                    return stringBuilder.toString();
                } catch (ClientProtocolException cpe) {
                    System.out.println("First Exception caz of HttpResponese :" + cpe);
                    cpe.printStackTrace();
                } catch (IOException ioe) {
                    System.out.println("Second Exception caz of HttpResponse :" + ioe);
                    ioe.printStackTrace();
                }

            } catch (UnsupportedEncodingException uee) {
                System.out.println("An Exception given because of UrlEncodedFormEntity argument :" + uee);
                uee.printStackTrace();
            }

            return null;
        }


             protected void onPostExecute(String result) {
              super.onPostExecute(result);

              if(result.equals("")){
                  dialog.cancel();
            Toast.makeText(getApplicationContext(), "Successfully logged in", Toast.LENGTH_LONG).show();
             }else{
                  dialog.cancel();
                Toast.makeText(getApplicationContext(), "Invalid Number or Pin", Toast.LENGTH_LONG).show();
               }
             }
             }

             SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask();
             sendPostReqAsyncTask.execute(givenUsername, givenPassword);

             }
        }