downloadWithExternalAppPreference = findPreference(getString(R.string.download_with_external_app_key));
scrollAppBarPreference = findPreference(getString(R.string.scroll_app_bar_key));
bottomAppBarPreference = findPreference(getString(R.string.bottom_app_bar_key));
displayAdditionalAppBarIconsPreference = findPreference(getString(R.string.display_additional_app_bar_icons_key));
appThemePreference = findPreference("app_theme");
downloadWithExternalAppPreference = findPreference(getString(R.string.download_with_external_app_key));
scrollAppBarPreference = findPreference(getString(R.string.scroll_app_bar_key));
bottomAppBarPreference = findPreference(getString(R.string.bottom_app_bar_key));
displayAdditionalAppBarIconsPreference = findPreference(getString(R.string.display_additional_app_bar_icons_key));
appThemePreference = findPreference("app_theme");