private void getHtml_data(String Url, int FontSize) {


                String text = "";

                try {

                        URL url = new URL(Url);

                        URLConnection conn;


                        conn = url.openConnection();

                        // Get the response

                        BufferedReader rd = new BufferedReader(new InputStreamReader(conn

                                        .getInputStream()));

                        String line = "";

                        String data = "";

                        while ((line = rd.readLine()) != null) {

                                Message lmsg;

                                lmsg = new Message();

                                lmsg.obj = line;

                                lmsg.what = 0;


                                data = data + (String) lmsg.obj;

                        }

                        text = data.replace("<body>", "<body style=\"font-size:" + FontSize

                                        + "px;\">");

                } catch (IOException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                }

                myWebView.loadDataWithBaseURL("", text, "text/html", "UTF-8", null);


        }



data就是你要的网页源码，text修改（就像我在body 加上size）
最后用myWebView.loadDataWithBaseURL("", text, "text/html", "UTF-8", null);