Android: Facebook get "User Access Token", on successful login

Question

I have been doing some login project via Facebook latest SDK i.e. 3.0. I'm getting a hard time in getting user access token. I have searched on the internet and all, maximum results were using the old SDK. Here is some bits of code which I have taken from Facebook Android SDK Tutorial:

public class LoginActivity extends Activity implements OnClickListener {

Button login;
TextView accessToken;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    login = (Button) findViewById(R.id.login);
    accessToken = (TextView) findViewById(R.id.accessToken);

    login.setOnClickListener(this);

}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Session.getActiveSession().onActivityResult(this, requestCode,
            resultCode, data);
}

@Override
public void onClick(View v) {
    // start Facebook Login
    Session.openActiveSession(this, true, new Session.StatusCallback() {

        // callback when session changes state
        @Override
        public void call(Session session, SessionState state,
                Exception exception) {
            if (session.isOpened()) {

                // make request to the /me API
                Request.executeMeRequestAsync(session,
                        new Request.GraphUserCallback() {

                            // callback after Graph API response with user
                            // object
                            @Override
                            public void onCompleted(GraphUser user,
                                    Response response) {
                                if (user != null) {
                                    TextView welcome = (TextView) findViewById(R.id.welcome);
                                    welcome.setText("Hello "
                                            + user.getName() + "!");
                                }
                            }
                        });
            }
        }
    });

}

}

Login was successful and I can see Username in the app, as suggested by the Facbeook tutorial.

I have tried old methods, but those all are now deprecated. Please guide me in getting User Access Token. Help will be appreciated.

Thanks.

Answer 1

In the method onResume() add the following code (in this case i used Toast.makeText to see the token access after login):

    Session session = Session.getActiveSession();
    if (session.isOpened()) {
        Toast.makeText(getActivity(), session.getAccessToken(), Toast.LENGTH_LONG).show();
    }

I used getActivity because it is in a Fragment in my case, if you have your login button in an Activity use "this" instead of "getActivity()"

Answer 2

Note: Session class is removed in new Facebook sdk

After Facebook SDK version 4.X, you should use following:

AccessToken token = AccessToken.getCurrentAccessToken();
if (token != null) {
    Toast.makeText(getActivity(), token, Toast.LENGTH_LONG).show();
}

Change log reference is here.

Migrate reference from Sdk 3.x to 4.x