up

app/src/main/java/io/legado/app/data/dao/BookGroupDao.kt

@@ -16,6 +16,9 @@ interface BookGroupDao {
     @get:Query("SELECT MAX(groupId) FROM book_groups")
     val maxId: Int
 
+    @get:Query("SELECT MAX(`order`) FROM book_groups")
+    val maxOrder: Int
+
     @Query("SELECT * FROM book_groups ORDER BY `order`")
     fun all(): List<BookGroup>
 

app/src/main/java/io/legado/app/ui/main/bookshelf/BookshelfViewModel.kt

@@ -10,11 +10,10 @@ class BookshelfViewModel(application: Application) : BaseViewModel(application)
 
     fun addGroup(groupName: String) {
         execute {
-            val maxId = App.db.bookGroupDao().maxId
             val bookGroup = BookGroup(
-                groupId = maxId.plus(1),
+                groupId = App.db.bookGroupDao().maxId.plus(1),
                 groupName = groupName,
-                order = maxId.plus(1)
+                order = App.db.bookGroupDao().maxOrder.plus(1)
             )
             App.db.bookGroupDao().insert(bookGroup)
         }