/**
 * Creates a listener, which allows to adapt the behavior of the {@link PreferenceActivity} when
 * the value, which determines, whether the action bar's back button should be overwritten, has
 * been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createOverrideBackButtonChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            if (newValue != null) {
                boolean overrideNavigationIcon = (boolean) newValue;
                ((PreferenceActivity) getActivity())
                        .overrideNavigationIcon(overrideNavigationIcon);
            }

            return true;
        }

    };
}
 

/**
 * Creates a listener, which allows to adapt the behavior of the {@link PreferenceActivity} when
 * the value, which determines, whether the navigation should be hidden, has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createHideNavigationChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            if (newValue != null) {
                boolean hideNavigation = (boolean) newValue;
                ((PreferenceActivity) getActivity()).hideNavigation(hideNavigation);
            }

            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the app's theme, when the value of the
 * corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createThemeChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            Intent intent = getActivity().getIntent();
            getActivity().finish();
            startActivity(intent);
            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the elevation of the toolbar, when the
 * value of the corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createToolbarElevationChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            int elevation = Integer.valueOf((String) newValue);
            ((PreferenceActivity) getActivity()).setToolbarElevation(elevation);
            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the width of the navigation, when the
 * value of the corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createNavigationWidthChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            int width = Integer.valueOf((String) newValue);
            ((PreferenceActivity) getActivity())
                    .setNavigationWidth(dpToPixels(getActivity(), width));
            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the elevation of the preference screen,
 * when the value of the corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createPreferenceScreenElevationChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            int elevation = Integer.valueOf((String) newValue);
            ((PreferenceActivity) getActivity()).setCardViewElevation(elevation);
            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the elevation of the bread crumbs, when
 * the value of the corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createBreadCrumbElevationChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            int elevation = Integer.valueOf((String) newValue);
            ((PreferenceActivity) getActivity()).setBreadCrumbElevation(elevation);
            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the elevation of a wizard's button bar,
 * when the value of the corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createWizardButtonBarElevationChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            int elevation = Integer.valueOf((String) newValue);
            ((PreferenceActivity) getActivity()).setButtonBarElevation(elevation);
            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the elevation of a preference
 * fragment's button bar, when the value of the corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createPreferenceFragmentButtonBarElevationChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            int elevation = Integer.valueOf((String) newValue);
            setButtonBarElevation(elevation);
            return true;
        }

    };
}
 

/**
 * Creates and returns a listener, which allows to adapt the app's theme, when the value of the
 * corresponding preference has been changed.
 *
 * @return The listener, which has been created, as an instance of the type {@link
 * OnPreferenceChangeListener}
 */
private OnPreferenceChangeListener createThemeChangeListener() {
    return new OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(final Preference preference, final Object newValue) {
            getActivity().recreate();
            return true;
        }

    };
}