Android HTTPで通信する（HTTPUrlConnection）

URL url = new URL("http://www.example.co.jp/index.html");
new HttpGetTask().execute(url);

class HttpGetTask extends AsyncTask<URL, Void, String> {
    @Override
    protected String doInBackground(URL... url) {
        String result = "";
        HttpURLConnection conn = null;
        try {
            conn = (HttpURLConnection) url[0].openConnection();
            conn.setReadTimeout(10000);
            conn.setConnectTimeout(15000);
            conn.setRequestMethod("GET");
            conn.setDoInput(true);
            conn.connect();
            int resp = conn.getResponseCode();
            // respを使っていろいろ
            result = readIt(conn.getInputStream());
        } catch(IOException e) {
            e.printStackTrace();
        } finally {
            if(conn != null) {
                conn.disconnect();
            }
        }
        return result;
    }

    public String readIt(InputStream stream) throws IOException, UnsupportedEncodingException {
        StringBuffer sb = new StringBuffer();
        String line = "";
        BufferedReader br = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
        while((line = br.readLine()) != null){
            sb.append(line);
        }
        try {
            stream.close();
        } catch(Exception e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

    @Override
    protected void onPostExecute(String resp){
        // onCreateとほぼ同じこと（Fragmentにデータを送る
        Bundle arguments = new Bundle();
        arguments.putString(ItemDetailFragment.ARG_ITEM_ID,
                getIntent().getStringExtra(ItemDetailFragment.ARG_ITEM_ID));
        arguments.putString("responseText", resp);
        ItemDetailFragment fragment = new ItemDetailFragment();
        fragment.setArguments(arguments);
        getFragmentManager().beginTransaction()
                .add(R.id.item_detail_container, fragment)
                .commit();
    }
}