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

            @Override
            protected String doInBackground(String...nothing) {
                UserFunctions userFunctions = new UserFunctions();
                JSONObject json = userFunctions.loginUser(KEY_USERNAME, KEY_PASSWORD);
                return "";


                @Override
                protected void onPostExecute(String result) {
                    try {
                    if (!KEY_USERNAME.equals("") && !KEY_PASSWORD.equals("")) {
                        loginErrorMsg.setText("Incorrect USername or Password");

                    //String res = json.getString(KEY_SUCCESS);
                    String res = json.getString(KEY_SUCCESS);
                    if(Integer.parseInt(res) ==1){
                    DatabaseHandler db = new DatabaseHandler (getApplicationContext());
                            JSONObject json_user = json.getJSONObject("user");


                        btnLogin.setOnClickListener(new View.OnClickListener() {


            public void onClick(View argo) {

            // Launch Dashboard Screen
            Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class);

            // Close all views before launching Dashboard
                                    dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                                        startActivity(dashboard);
                                        finish();

                                    }
                                });

                            }else{
                                //Error in Login
                                loginErrorMsg.setText("Incorrect     username/password");
                            }
                        }

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