private boolean isInDualPaneMode() {
        return preferenceContentView == R.id.settings_fragment_content_root;
    }
An {@link AppCompatActivity} that presents a set of application settings. On
handset devices, settings are presented as a single list. On tablets,
settings are split by category, with category headers shown to the left of
the list of settings.
<p>
See <a href="http://developer.android.com/design/patterns/settings.html"> Android Design: Settings</a> for design
guidelines and the <a href="http://developer.android.com/guide/topics/ui/settings.html">Settings API Guide</a> for
more information on developing a Settings UI.
main/src/main/java/cgeo/geocaching/settings/SettingsActivity.java