pref_category_reader_key pref_category_accounts_key pref_category_downloads_key pref_category_cache_key pref_category_about_key pref_default_viewer_key pref_hide_status_bar_key pref_lock_orientation_key pref_enable_transitions_key pref_show_page_number_key pref_keep_screen_on_key pref_custom_brightness_key pref_custom_brightness_value_key pref_reader_theme_key pref_download_directory_key pref_download_slots_key pref_chapter_cache_size_key pref_clear_chapter_cache_key pref_version pref_build_time