How to check if user is logged in with FB SDK 4.0 for Android?

Question

A few days ago I implemented FB Login to my APP, and today I found out that most of the things I have implemented are now deprecated.

Before, I was using Sess

Answer 1

You can use the same way Felipe mentioned in his answer or you can use the other two ways. But it seems AccessTokenTracker is the convenient way, since it helps you to track the access tokens (use with ProfileTracker class)

1. If you are using a custom button for your login use LoginManager call back

For example

In your layout xml

In your Activity

    //Custom Button
    Button myFacebookButton = (Button) findViewById(R.id.my_facebook_button);

The button onclick Listener

public void facebookLogin(View view) {
        LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("public_profile", "user_friends"));
    }

At the end the LoginManager Callback

 //Create callback manager to handle login response
        CallbackManager callbackManager = CallbackManager.Factory.create();

       LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback() {
           @Override
           public void onSuccess(LoginResult loginResult) {
               Log.i(TAG, "LoginManager FacebookCallback onSuccess");
               if(loginResult.getAccessToken() != null) {
                   Log.i(TAG, "Access Token:: " + loginResult.getAccessToken());
                   facebookSuccess();
               }
           }

           @Override
           public void onCancel() {
               Log.i(TAG, "LoginManager FacebookCallback onCancel");
           }

           @Override
           public void onError(FacebookException e) {
               Log.i(TAG, "LoginManager FacebookCallback onError");
           }
       });

2. If you are using the button (com.facebook.login.widget.LoginButton) provided in SDK use LoginButton callback (This is crealy detailed in their reference doc - https://developers.facebook.com/docs/facebook-login/android/v2.3)

For example

In your layout xml

In your activity

    //Facebook SDK provided LoginButton
    LoginButton loginButton = (LoginButton) findViewById(R.id.login_button);
    loginButton.setReadPermissions("user_friends");
    //Callback registration
    loginButton.registerCallback(callbackManager, new FacebookCallback() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            // App code
            Log.i(TAG, "LoginButton FacebookCallback onSuccess");
            if(loginResult.getAccessToken() != null){
                Log.i(TAG, "Access Token:: "+loginResult.getAccessToken());
                facebookSuccess();
            }

        }

        @Override
        public void onCancel() {
            // App code
            Log.i(TAG, "LoginButton FacebookCallback onCancel");
        }

        @Override
        public void onError(FacebookException exception) {
            // App code
            Log.i(TAG, "LoginButton FacebookCallback onError:: "+exception.getMessage());
            Log.i(TAG,"Exception:: "+exception.getStackTrace());
        }
    });

Dont forget to call callbackManager.onActivityResult(requestCode, resultCode, data); in your Activity onActivityResult()