Android : how to extract webpage links in eclipse

i want to extract all links of special webpage i try this:

URL url;
                InputStream is = null;
                BufferedReader br;
                String line;
                try {
                    url = new URL("http://www.stackoverflow.com");
                    is = url.openStream();  // throws an IOException
                    br = new BufferedReader(new InputStreamReader(is));

                    while ((line = br.readLine()) != null) {
                        if(line.contains("href="))
                           t1.setText(t1.getText()+line.trim());
                    }
                } catch (MalformedURLException mue) {
                     mue.printStackTrace();
                } catch (IOException ioe) {
                     ioe.printStackTrace();
                } finally {
                    try {
                        if (is != null) is.close();
                    } catch (IOException ioe) {
                        //exception
                    }
                }

but it doesnt do anything... please help me if you have otherway please help