new Thread(new Runnable() {
          @Override
          public void run() {
            doRequest();
          }
        }).start();
//發(fā)起網(wǎng)絡(luò)請求        
private void doRequest() {
  HttpURLConnection connection = null;
  BufferedReader reader = null;
  try {
    //1.獲取 HttpURLConnection 實(shí)例.注意要用 https 才能獲取到結(jié)果！
    URL url = new URL("https://www.baidu.com");
    connection = (HttpURLConnection) url.openConnection();
    //2.設(shè)置 HTTP 請求方式
    connection.setRequestMethod("GET");
    //3.設(shè)置連接超時(shí)和讀取超時(shí)的毫秒數(shù)
    connection.setConnectTimeout(5000);
    connection.setReadTimeout(5000);
    //4.獲取服務(wù)器返回的輸入流
    InputStream inputStream = connection.getInputStream();
    //5.對獲取的輸入流進(jìn)行讀取
    reader = new BufferedReader(new InputStreamReader(inputStream));
    final StringBuilder response = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
      response.append(line);
    }
    //然后處理讀取到的信息 response。返回的結(jié)果是 HTML 代碼，字符非常多。
    runOnUiThread(new Runnable() {
      @Override
      public void run() {
        tvResponse.setText(response.toString());

      }
    });
  } catch (MalformedURLException e) {
    e.printStackTrace();
  } catch (IOException e) {
    e.printStackTrace();
  } finally {
    if (reader != null) {
      try {
        reader.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    if (connection != null) {
      connection.disconnect();
    }
  }
}