优化

app/src/main/java/io/legado/app/ui/main/bookshelf/style1/BookshelfFragment1.kt

@@ -130,8 +130,18 @@ class BookshelfFragment1 : BaseBookshelfFragment(R.layout.fragment_bookshelf),
             return bookGroups[position].groupName
         }
 
+        /**
+         * 确定视图位置是否更改时调用
+         * @return POSITION_NONE 已更改,刷新视图. POSITION_UNCHANGED 未更改,不刷新视图
+         */
         override fun getItemPosition(`object`: Any): Int {
-            return POSITION_NONE
+            val fragment = `object` as BooksFragment
+            val position = fragment.position
+            val group = bookGroups[position]
+            if (fragment.groupId != group.groupId) {
+                return POSITION_NONE
+            }
+            return POSITION_UNCHANGED
         }
 
         override fun getItem(position: Int): Fragment {

app/src/main/java/io/legado/app/ui/main/bookshelf/style1/books/BooksFragment.kt

@@ -63,10 +63,12 @@ class BooksFragment() : BaseFragment(R.layout.fragment_books),
     }
     private var booksFlowJob: Job? = null
     private var savedInstanceState: Bundle? = null
-    private var position = 0
-    private var groupId = -1L
+    var position = 0
+        private set
+    var groupId = -1L
+        private set
     private var bookSort = 0
-    private var upLastUpdateTimeJob : Job? = null
+    private var upLastUpdateTimeJob: Job? = null
 
     override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) {
         this.savedInstanceState = savedInstanceState