新浪微博登陆，获取token

用WeiboAuthListener获取code

用下面的代码获取token。。半成品的sdk真让人捉急。

String code = values.getString("code");
            if(code != null){
                mText.setText("取得认证code: 
 Code: " + code);
                Toast.makeText(MainActivity.this, "认证code成功", Toast.LENGTH_SHORT).show();
            }

            try {
                URL url = new URL("https://api.weibo.com/oauth2/access_token");
                URLConnection connection = url.openConnection();
                connection.setDoOutput(true);
                OutputStreamWriter out = new OutputStreamWriter(connection
                        .getOutputStream(), "utf-8");
                out.write("client_id=id&client_secret=secret&grant_type=authorization_code" +
                        "&code="+code+"&redirect_uri=uri");
                out.flush();
                out.close();
                String sCurrentLine;
                String sTotalString;
                sCurrentLine = "";
                sTotalString = "";
                InputStream l_urlStream;
                l_urlStream = connection.getInputStream();
                BufferedReader l_reader = new BufferedReader(new InputStreamReader(
                        l_urlStream));
                while ((sCurrentLine = l_reader.readLine()) != null) {
                    sTotalString += sCurrentLine;
                }

                JSONObject o=new JSONObject(sTotalString);
                System.out.println(o.getString("access_token"));

            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }