feat: 优化代码

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

@@ -38,5 +38,11 @@
         <item>9</item>
     </string-array>
 
+    <string-array name="screen_direction_value">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+        <item>3</item>
+    </string-array>
 
 </resources>

app/src/main/res/xml/pref_config_other.xml

@@ -8,10 +8,10 @@
 
         <ListPreference
             android:key="@string/pk_requested_direction"
-            android:defaultValue="@string/screen_unspecified"
+            android:defaultValue="0"
             android:title="@string/screen_direction"
             android:entries="@array/screen_direction_title"
-            android:entryValues="@array/screen_direction_title"
+            android:entryValues="@array/screen_direction_value"
             app:iconSpaceReserved="false" />
 
         <io.legado.app.ui.widget.prefs.SwitchPreference