feat: 优化代码

app/src/main/java/io/legado/app/ui/book/arrange/ArrangeBookActivity.kt

@@ -213,6 +213,10 @@ class ArrangeBookActivity : VMBaseActivity<ArrangeBookViewModel>(R.layout.activi
         select_action_bar.upCountView(adapter.selectedBooks().size, adapter.getItems().size)
     }
 
+    override fun updateBook(vararg book: Book) {
+        viewModel.updateBook(*book)
+    }
+
     override fun deleteBook(book: Book) {
         alert(titleResource = R.string.draw, messageResource = R.string.sure_del) {
             okButton {

app/src/main/java/io/legado/app/ui/book/arrange/ArrangeBookAdapter.kt

@@ -127,19 +127,26 @@ class ArrangeBookAdapter(context: Context, val callBack: CallBack) :
     override fun onMove(srcPosition: Int, targetPosition: Int): Boolean {
         Collections.swap(getItems(), srcPosition, targetPosition)
         notifyItemMoved(srcPosition, targetPosition)
+        if (getItem(srcPosition)?.order == getItem(targetPosition)?.order) {
+            for ((index, item) in getItems().withIndex()) {
+                item.order = index + 1
+            }
+        }
         isMoved = true
         return true
     }
 
     override fun onClearView(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder) {
         if (isMoved) {
-
+            callBack.updateBook(*getItems().toTypedArray())
         }
+        isMoved = false
     }
 
     interface CallBack {
         val groupList: List<BookGroup>
         fun upSelectCount()
+        fun updateBook(vararg book: Book)
         fun deleteBook(book: Book)
         fun selectGroup(groupId: Int, requestCode: Int)
     }