优化

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

@@ -12,6 +12,14 @@
 		<item>Folder</item>
 	</string-array>
 
+	<string-array name="book_sort">
+		<item>@string/text_default</item>
+		<item>@string/bookshelf_px_0</item>
+		<item>@string/bookshelf_px_1</item>
+		<item>@string/bookshelf_px_2</item>
+		<item>@string/bookshelf_px_3</item>
+	</string-array>
+
 	<string-array name="indent">
 		<item>@string/indent_0</item>
 		<item>@string/indent_1</item>

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

@@ -667,6 +667,7 @@
     <string name="plus">Plus</string>
     <string name="system_typeface">System typeface</string>
     <string name="delete_book_file">Delete source file</string>
+    <string name="text_default">Default</string>
     <string name="default1">Default-1</string>
     <string name="default2">Default-2</string>
     <string name="default3">Default-3</string>