android 發送http請求方法和異常解決方法

String httpUrl = "http://api.hcl100.com/index.php/Applist/search/paging/0";
                    /* 建立HTTP Get對象 */
                    HttpGet httpRequest = new HttpGet(httpUrl);
                    try {
                        /* 發送請求并等待響應 */
                        HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest);
                        /* 若狀態碼為200 ok */
                        if (httpResponse.getStatusLine().getStatusCode() == 200) {
                            /* 讀 */
                            String strResult = EntityUtils.toString(httpResponse
                                    .getEntity());
                            /* 去沒有用的字符 */
                            System.out.println(strResult);
                        } else {
                            System.out.println("123123");
                        }
                    } catch (ClientProtocolException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

出現new DefaultHttpClient().execute(httpRequest)空的話 另開線程解決