fix scrollView顶部时下拉刷新

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

@@ -423,11 +423,15 @@ class BookInfoActivity :
                 }
             }
         }
+
         refreshLayout?.setOnRefreshListener {
+            // scrollView 顶部
+            if (scrollView.scrollY <= 0) {
                 refreshLayout.isRefreshing = false
                 refreshBook()
             }
         }
+    }
 
     private fun setSourceVariable() {
         launch {