优化

app/src/main/res/menu/import_book.xml

@@ -4,6 +4,12 @@
     xmlns:tools="http://schemas.android.com/tools"
     tools:ignore="AlwaysShowAction">
 
+    <item
+        android:id="@+id/menu_search"
+        android:icon="@drawable/ic_search"
+        android:title="@string/search"
+        app:showAsAction="always" />
+
     <item
         android:id="@+id/menu_select_folder"
         android:icon="@drawable/ic_folder_open"