Why doesn't Android Facebook interface work with Fragments?

Question

I\'m switching some Android Facebook code from an Activity to a Fragment. Prior to the switch everything worked fine, but now the

Answer 1

Actually if you look at Facebook Docs for Android you'll see the login example uses fragment in it.

There is LoginButton widget that Facebook SDK provides and it has a method called setFragment and you pass the target fragment that you want to use login functionality with.

In your fragment layout

Add the login button that Facebook SDK provides.

In your fragment

Create UiLifecycleHelper and StatusCallback objects in your fragment.

private UiLifecycleHelper uiHelper;
private Session.StatusCallback callback = new Session.StatusCallback() {
    @Override
    public void call(Session session, SessionState state, Exception exception) {
        onSessionStateChange(session, state, exception);
    }
};

Add a method to handle the user state changes.

private void onSessionStateChange(Session session, SessionState state, Exception exception) {
    if (state.isOpened()) {
        Log.i("LoginFragment", "Logged in...");
        Log.i("LoginFragment", session.getAccessToken());
        doAnythingWithTheFacebookToken(session.getAccessToken());
    } else if (state.isClosed()) {
        // this part is called when user login fails
        Log.i("LoginFragment", "Logged out...");
    }
}

Override the fragment lifecycle methods

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    uiHelper = new UiLifecycleHelper(getActivity(), callback);
    uiHelper.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    // inflate your fragment view

    facebookLoginButton = (LoginButton) view.findViewById(R.id.facebook_login_button);
    facebookLoginButton.setFragment(this);
}

@Override
public void onResume() {
    super.onResume();
    // For scenarios where the main activity is launched and user
    // session is not null, the session state change notification
    // may not be triggered. Trigger it if it's open/closed.
    Session session = Session.getActiveSession();
    if (session != null &&
            (session.isOpened() || session.isClosed())) {
        onSessionStateChange(session, session.getState(), null);
    }

    uiHelper.onResume();
}

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

@Override
public void onPause() {
    super.onPause();
    uiHelper.onPause();
}

@Override
public void onDestroy() {
    super.onDestroy();
    uiHelper.onDestroy();
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    uiHelper.onSaveInstanceState(outState);
}

Result

Normally you'd need to override onActivityResult in your activity but calling setFragment() on Facebook Login Button allows your fragment to receive the result in its own onActivityResult.

If you want to use a different button (your own button for example):

• hide the facebookLoginButton in layout

• call performClick() on facebookLoginButton inside the onclick listener of your actual button

That's it.