.

app/src/main/java/io/legado/app/ui/bookinfo/BookInfoActivity.kt

@@ -36,7 +36,6 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
 
     private var changeSourceDialog: ChangeSourceDialog? = null
     private lateinit var adapter: ChapterListAdapter
-    private var reorder: Boolean = false; // 是否倒序
 
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         setSupportActionBar(toolbar)
@@ -205,7 +204,7 @@ class BookInfoActivity : VMBaseActivity<BookInfoViewModel>(R.layout.activity_boo
             }
         }
         iv_chapter_top.onClick {
-            reorder = !reorder;
+            adapter.reorder = !adapter.reorder;
             adapter.notifyDataSetChanged();
         }
     }

app/src/main/java/io/legado/app/ui/bookinfo/ChapterListAdapter.kt

@@ -13,16 +13,22 @@ import org.jetbrains.anko.textColorResource
 class ChapterListAdapter(context: Context, var callBack: CallBack) :
     SimpleRecyclerAdapter<BookChapter>(context, R.layout.item_chapter_list) {
 
+    var reorder: Boolean = false; // 是否倒序
+
     override fun convert(holder: ItemViewHolder, item: BookChapter, payloads: MutableList<Any>) {
         holder.itemView.apply {
-            tv_chapter_name.text = item.title
-            if (item.index == callBack.durChapterIndex()) {
+            var _item: BookChapter = item;
+            if (reorder) {
+                _item = getItems().get(getItems().size - item.index - 1);
+            }
+            tv_chapter_name.text = _item.title
+            if (_item.index == callBack.durChapterIndex()) {
                 tv_chapter_name.setTextColor(context.accentColor)
             } else {
                 tv_chapter_name.textColorResource = R.color.tv_text_secondary
             }
             this.onClick {
-                callBack.openChapter(item)
+                callBack.openChapter(_item)
             }
         }
     }