优化

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

@@ -16,6 +16,9 @@ interface BookGroupDao {
     @Query("SELECT * FROM book_groups ORDER BY `order`")
     fun liveDataAll(): LiveData<List<BookGroup>>
 
+    @Query("SELECT * FROM book_groups where groupId >= 0 ORDER BY `order`")
+    fun liveDataSelect(): LiveData<List<BookGroup>>
+
     @get:Query("SELECT sum(groupId) FROM book_groups")
     val idsSum: Long
 

app/src/main/java/io/legado/app/ui/book/group/GroupSelectDialog.kt

@@ -109,7 +109,7 @@ class GroupSelectDialog : BaseDialogFragment(), Toolbar.OnMenuItemClickListener
     }
 
     private fun initData() {
-        App.db.bookGroupDao().liveDataAll().observe(viewLifecycleOwner, {
+        App.db.bookGroupDao().liveDataSelect().observe(viewLifecycleOwner, {
             adapter.setItems(it)
         })
     }

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

@@ -64,7 +64,7 @@ class BookshelfViewModel(application: Application) : BaseViewModel(application)
 
     fun checkGroup(groups: List<BookGroup>) {
         groups.forEach { group ->
-            if (group.groupId > 0 && group.groupId and (group.groupId - 1) != 0L) {
+            if (group.groupId >= 0 && group.groupId and (group.groupId - 1) != 0L) {
                 var id = 1L
                 val idsSum = App.db.bookGroupDao().idsSum
                 while (id and idsSum != 0L) {