优化

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

@@ -34,6 +34,9 @@ interface BookGroupDao {
     @Query("update book_groups set show = 1 where groupId = :groupId")
     fun enableGroup(groupId: Long)
 
+    @Query("select groupName from book_groups where groupId > 0 and (groupId & :id) > 0")
+    fun getGroupNames(id: Long): List<String>
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insert(vararg bookGroup: BookGroup)
 

app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt

@@ -119,13 +119,7 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
 
     fun loadGroup(groupId: Long, success: ((groupNames: String?) -> Unit)) {
         execute {
-            val groupNames = arrayListOf<String>()
+            App.db.bookGroupDao().getGroupNames(groupId).joinToString(",")
-            App.db.bookGroupDao().all.forEach {
-                if (groupId and it.groupId > 0) {
-                    groupNames.add(it.groupName)
-                }
-            }
-            groupNames.joinToString(",")
         }.onSuccess {
             success.invoke(it)
         }