在Android应用中获取刷新的Facebook令牌的代码是什么？

Question

我正在开发一款Android应用.随着Facebook的offline_access权限即将弃用,我试图使用Graph API来扩展Facebook令牌.

        https://graph.facebook.com/oauth/access_token?             
        client_id=APP_ID&
        client_secret=APP_SECRET&
        grant_type=fb_exchange_token&
        fb_exchange_token=EXISTING_ACCESS_TOKEN

任何人都可以提供详细的代码,演示如何将上述代码实现到Android应用程序并获取刷新的Facebook令牌？

感谢您的时间.

更新二:

进步(我想)!

使用带有facebook请求方法的完整URL会导致基本URL被添加到URL的开头而不是

String refreshUrl = "https://graph.facebook.com/oauth/access_token?client_id=12345678910&client_secret=abcdefghijklmnopqrstuvwxyz&grant_type=fb_exchange_token&fb_exchange_token="+currentAccessToken;

应该用

String refreshUrl = "oauth/access_token?client_id=12345678910&client_secret=abcdefghijklmnopqrstuvwxyz&grant_type=fb_exchange_token&fb_exchange_token="+currentAccessToken;

但是我现在收到响应{"error":{"message":"验证应用程序时出错.应用程序ID无效.","类型":"OAuthException","code":190}}

更新一:

这是我尝试过的.代码完成,即listerner上的OnComplete被调用,但响应不包含新的访问令牌或到期值.

    void refreshWithGraph() {
        AsyncFacebookRunner extendingAsyncRunner = new AsyncFacebookRunner(facebook);
        Bundle parameters = new Bundle();

        //the variable currentAccessToken is obtained after authorisation is complete using currentAccessToken = facebook.getAccessToken();

        String refreshUrl = "https://graph.facebook.com/oauth/access_token?client_id=12345678910&client_secret=abcdefghijklmnopqrstuvwxyz&grant_type=fb_exchange_token&fb_exchange_token="+currentAccessToken;


    extendingAsyncRunner.request(refreshUrl, parameters, new RefreshListener(), null );
   }

这是我的RefreshListener版本......

  //REFRESH LISTENER
    public class RefreshListener extends BaseRequestListener {

        public void onComplete(final String response, Object state) {


            try {
               final JSONObject json = Util.parseJson(response);

                runOnUiThread(new Runnable() {

                    @Override
                    public void run() {             
                        tvRefreshResponse.setText("IN REFRESH LISTENER ONCOMPLETE\nResponse is " + response);
                        tvRefreshToken.setText("IN REFRESH LISTENER ONCOMPLETE\nToken is " + facebook.getAccessToken());
                        tvRefreshExpiry.setText("IN REFRESH LISTENER ONCOMPLETE\nFacebook expiry is " + millisecToDate(facebook.getAccessExpires()));

                    }

                }); //end runOnUiThread



            } catch (JSONException e) {
                runOnUiThread(new Runnable() {

                            @Override
                            public void run() {
                                tvRefreshResponse.setText("IN REFRESH LISTENER ONCOMPLETE CAUGHT JSON EXCEPTION \nResponse is " + response);

                            }

                         }); //end runOnUiThread

            } catch (FacebookError fe) {
                runOnUiThread(new Runnable() {


                            @Override
                            public void run() {
                                tvRefreshResponse.setText("IN REFRESH LISTENER ONCOMPLETE CAUGHT FACEBOOK ERROR \nResponse is " + response);

                            }

                         }); //end runOnUiThread
            } //end catch Facebook error

        }  //end onComplete


        @Override
        public void onIOException(IOException e, Object state) {
            tvRefreshResponse.setText("IN REFRESH LISTENER IOEXCEPTION \nException is "+ e.getLocalizedMessage());

        }

        @Override
        public void onFileNotFoundException(FileNotFoundException e, Object state) {
            tvRefreshResponse.setText("IN REFRESH LISTENER FILE NOT FOUND EXCEPTION \nException is "+ e.getLocalizedMessage());
        }

        @Override
        public void onMalformedURLException(MalformedURLException e, Object state) {
            tvRefreshResponse.setText("IN REFRESH MALFORMED URL \nException is "+ e.getLocalizedMessage());

        }

        @Override
        public void onFacebookError(FacebookError e, Object state) {
            tvRefreshResponse.setText("IN REFRESH ONFACEBOOK ERROR \nException is "+ e.getLocalizedMessage());

        }
    } //end RefreshListener

代码完成,即listerner上的OnComplete被调用,但响应不包含新的访问令牌或到期值.回应是......

 {"id":"https:\/\/graph.facebook.com\/oauth\/access_token","shares":78,"comments":1}

当我将相同的URL(带有字母数字当前令牌值)放入Web浏览器时,响应包括访问令牌.

---

相关信息

Facebook的offline_access权限将于2012年5月1日弃用

请不要建议使用onResume()中的extendAccessTokenIfNeeded函数.我也遇到了麻烦,这就是为什么我要调查图谱API令牌的原因:-)

相关的Stack Overflow问题

是否可以在Android应用中使用extendAccessTokenIfNeeded扩展Facebook令牌？(我的问题)

5月1日之后弃用后,offline_access如何工作？

Facebook访问令牌无法扩展

为extendAccessToken使用保护app秘密(Java/Android)

相关的Facebook链接

Facebook Android教程

Facebook offline_access权限已弃用

Answer 1

说实话,我有点困惑 - 看起来你有一切都可以完成 - 而且很简单.但是,让我试着回答你的问题.以下是我的C#项目中的代码,如果您不熟悉C#语言和类,我将使用我的注释扩展应用程序的标记:

string currentToken = "token from somewhere";

// WebClient is used to send GET request to the given URL
// and receive the response
using (var req = new System.Net.WebClient())
{
    // create URL string and fill it in with data (app Id, secret, and current token)
    var extendTokenUrl = string.Format(
        "https://graph.facebook.com/oauth/access_token?client_id={0}&client_secret={1}&grant_type=fb_exchange_token&fb_exchange_token={2}",
        FB_APP_ID,
        FB_APP_SECRET,
        currentToken);

    // send GET request and download the response
    var response = req.DownloadString(extendTokenUrl);

    // if all is good, response will be a string which looks like this:
    // access_token=<<THE TOKEN GOES HERE>>
    var newToken = response.Substring("access_token=".Length);

    // now save newToken in your DB INSTEAD of currentToken - 
    // so all calls will be made with extended token
    SaveTokenInDB(newToken);
}

希望有所帮助,并将其转换为Java应该是直截了当的.