onCreate.java

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

    //printKeyHash();

    callbackManager = CallbackManager.Factory.create();

    txtBirthday = (TextView) findViewById(R.id.txt_birthday);
    txtEmail = (TextView) findViewById(R.id.txt_email);
    txtFriends = (TextView) findViewById(R.id.txt_friends);
    txtLocation = (TextView) findViewById(R.id.txt_locale);
    
    imgAvatar = (ImageView) findViewById(R.id.avatar);

    LoginButton loginButton = (LoginButton) findViewById(R.id.login_button);

    loginButton.setReadPermissions(Arrays.asList("public_profile",
            "email",
            "user_location",
            "user_birthday",
            "user_friends"));

    loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {

        }

        @Override
        public void onCancel() {

        }

        @Override
        public void onError(FacebookException error) {

        }
    });
}