优化

app/src/main/res/values/array_values.xml

@@ -31,6 +31,7 @@
         <item>1</item>
         <item>2</item>
         <item>3</item>
+        <item>4</item>
     </string-array>
 
     <string-array name="double_page_value">

app/src/main/res/values/arrays.xml

@@ -59,6 +59,7 @@
 		<item>@string/screen_portrait</item>
 		<item>@string/screen_landscape</item>
 		<item>@string/screen_sensor</item>
+		<item>反向竖屏</item>
 	</string-array>
 
 	<string-array name="double_page_title">