为什么用视频里的代码打结果什么页面都没有

Question

什么报错都没有就是一片空白，代码明明和视频中的一样 public class HttpThread extends Thread {     private String urlString;     private Handler handler;     private WebView view;     public HttpThread(String urlString, Handler handler, WebView view) {         super();         this.urlString = urlString;         this.handler = handler;         this.view = view;     }     @Override     public void run() {         // TODO Auto-generated method stub         try {             URL url = new URL(urlString);             HttpURLConnection connection = (HttpURLConnection)url.openConnection();             connection.setReadTimeout(5000);             connection.setRequestMethod("GET");             BufferedReader bReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));             final StringBuffer sBuffer= new StringBuffer();             String string;             if((string = bReader.readLine()) != null){                 sBuffer.append(string);                 Log.i("sz", string);             }             handler.post(new Runnable() {                                  @Override                 public void run() {                     // TODO Auto-generated method stub                     view.loadData(sBuffer.toString(), "text/html; charset=gb2312", null);                 }             });         } catch (MalformedURLException e) {             // TODO Auto-generated catch block             e.printStackTrace();         } catch (IOException e) {             // TODO Auto-generated catch block             e.printStackTrace();         }     } }