public void btn(View view)    {        new myWorker().execute("这里是网址");    }
　　　　//异步操作，防止UI线程阻塞。    private class myWorker extends AsyncTask<String,Void,String>
    {        protected String doInBackground(String...urls)        {            StringBuilder builder = new StringBuilder(100000);            for (String url : urls) {
　　　　　　　　                DefaultHttpClient client = new DefaultHttpClient();
　　　　　　　　　　                HttpGet httpGet = new HttpGet(url);                try {                    HttpResponse execute = client.execute(httpGet);
                    InputStream content = execute.getEntity().getContent();                    BufferedReader buffer = new BufferedReader(new InputStreamReader(content));                    String s = "";                    while ((s = buffer.readLine()) != null) {                        builder.append(s);                    }                } catch (Exception e) {                    e.printStackTrace();                }            }            return builder.toString();        }        protected void onPostExecute(String result)        {　　
　　　　
　　　　　　　　//源码显示在Textview中            TextView textView=(TextView)findViewById(R.id.tv1);                        textView.setText(result);            //获得源码        }    }