Android调用Web服务错误

Question

你好我的Android应用程序当我在Android应用程序中访问登录的webservice时它成功运行在模拟器上但是在真实设备上安装后它给出了错误，不幸停止应用程序如何解决此错误

这是我的代码

private void login(final String username, String password) {

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

            private Dialog loadingDialog;

            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                loadingDialog = ProgressDialog.show(LoginActivity.this, "Please wait", "Loading...");
            }

            @Override
            protected String doInBackground(String... params) {
                String uname = params[0];
                String pass = params[1];
                InputStream is = null;
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("mobile", uname));
                nameValuePairs.add(new BasicNameValuePair("password", pass));
                String result = null;

                try {
                    HttpClient httpClient = new DefaultHttpClient();
                    HttpPost httpPost = new HttpPost("https://myurl/soapapi/login.php");
                    httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                    HttpResponse response = httpClient.execute(httpPost);

                    HttpEntity entity = response.getEntity();

                    is = entity.getContent();

                    BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
                    StringBuilder sb = new StringBuilder();

                    String line = null;
                    while ((line = reader.readLine()) != null) {
                        sb.append(line + "\n");
                    }
                    result = sb.toString();
                } catch (ClientProtocolException e) {
                    e.printStackTrace();
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return result;
            }

            @Override
            protected void onPostExecute(String result) {
                String s = result.trim();
                String[] t_id = s.split(" ");
                String status = t_id[1].toString();
                loadingDialog.dismiss();
                if (s.equalsIgnoreCase(status)) {
                    Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                    //intent.putExtra(USER_NAME, username);
                    finish();
                    startActivity(intent);
                } else {
                    Toast.makeText(getApplicationContext(), "Invalid User Name or Password", Toast.LENGTH_LONG).show();
                }
            }
        }

        LoginAsync la = new LoginAsync();
        la.execute(username, password);

    }


}