What is the code for getting a refreshed Facebook token in an Android app?

Question

I am developing an Android app. With the impending deprecation of Facebook's offline_access permission I am trying to use the Graph API to extend the Facebook token.

        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

Can anyone provide detailed code that demonstrates how to implement the code above into an android app and obtain the refreshed Facebook token?

Thank you for your time.

Update Two:

Progress (I think)!

Using the full URL with the facebook request method results in the base URL being added to the the beginning of the URL So instead of

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

should use

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

However I am now getting the response {"error":{"message":"Error validating application. Invalid application ID.","type":"OAuthException","code":190}}

Update One:

Here is what I have I tried. The code completes, that is OnComplete on the listerner is called, BUT the response does not contain a new access token or expiry value.

    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 );
   }

Here is my version of RefreshListener...

  //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

The code completes, that is OnComplete on the listerner is called, BUT the response does not contain a new access token or expiry value. The response is...

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

When I put the same URL (with a alphanumeric current token value) into a web browser the response DOES include an access token.

---

Related Info

Facebook's offline_access permission will be deprecated on 1st of May, 2012

Please don't suggest using the extendAccessTokenIfNeeded function in onResume() instead. I am also having trouble with that and it is the reason why I am looking into the Graph API token refreshing :-)

Related Stack Overflow Questions

Is it possible to extend Facebook tokens with extendAccessTokenIfNeeded in an Android app? (my question)

How would offline_access work after deprecation after May 1st?

Facebook access token can not be extended

Protecting app secret for extendAccessToken usage (Java/Android)

Relevant Facebook links

Facebook Android Tutorial

Facebook offline_access permission deprecation

Answer 1

To be honest, I'm a bit confused - looks like you have everything to get it done - and it's simple. But let me try to answer your question. Here is the code from my C# project where I extend app's token with my comments in case you are not familiar with C# languages and classes:

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);
}

hope that helps, and translating this into Java should be straightforward.