Android Facebook sample app doesn't login when FB app installed

Question

At first I thought this was my app but I get the exact same problem when using any of the FB sample apps.

Take the HelloFacebookSample for example, which gives you a

Answer 1

I found the next line that helped me in the above scenario:

mLoginFacebook.setReadPermissions(Arrays.asList("email"));

it comes right after:

mLoginFacebook = (LoginButton) rootView.findViewById(R.id.authButton);
mLoginFacebook.setFragment(this);

solved all my problems.. Cheers