在 RecyclerView 中的特定位置拖放停止

本文介绍了在 RecyclerView 中的特定位置拖放停止的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

有没有什么方法可以使用 RecyclerView 来停止项目的拖放到特定位置.我已经实现了 Drag &使用下面的代码删除.

Is there any way to Halt the Drag Drop of item for specific position using RecyclerView. I have achieved the Drag & Drop using below code.

val _ithCallback = object : ItemTouchHelper.Callback() { //and in your implementation of override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean { val fromPosition = viewHolder.adapterPosition val toPosition = target.adapterPosition // Video position if (fromPosition == list.size - 1 || toPosition == list.size - 1) { return false } if (list[fromPosition].trim().isEmpty()){ return false } if (fromPosition < toPosition) { for (i in fromPosition until toPosition) { Collections.swap(list, i, i + 1) } } else { for (i in fromPosition downTo toPosition + 1) { Collections.swap(list, i, i - 1) } } adapter?.notifyItemMoved(fromPosition, toPosition) return true } override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) { } //defines the enabled move directions in each state (idle, swiping, dragging). override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int { return makeFlag(ItemTouchHelper.ACTION_STATE_DRAG, ItemTouchHelper.DOWN or ItemTouchHelper.UP or ItemTouchHelper.START or ItemTouchHelper.END) } }

并像这样使用它

val ith = ItemTouchHelper(_ithCallback) ith.attachToRecyclerView(imagesRecyclerView)

推荐答案

最后，经过对 ItemTouchHelper 类的大量研究，我这样解决了.

Finally, after lots of research in ItemTouchHelper class i resolved it like this.

我所做的是将标志设置为 ACTION_STATE_IDLE 我想停止拖放.希望它可以帮助像我这样的人.

What i have done is set the flag as ACTION_STATE_IDLE where i want to halt the Drag and Drop. Hope it helps someone like me.

以下是 Kotlin 版本.如果有人在 JAVA 中需要相同的内容，我可以转换它.

Below is the Kotlin version. If anyone needs the same in JAVA i can convert it.

//defines the enabled move directions in each state (idle, swiping, dragging). override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int { // The position i want to lock/halt if (list[viewHolder.adapterPosition].trim().isEmpty()){ return makeFlag(ItemTouchHelper.ACTION_STATE_IDLE, ItemTouchHelper.DOWN or ItemTouchHelper.UP) } // The position i want to lock/halt if (viewHolder.adapterPosition == list.size - 1){ return makeFlag(ItemTouchHelper.ACTION_STATE_IDLE, ItemTouchHelper.DOWN or ItemTouchHelper.UP) } // else enabling ACTION_STATE_DRAG return makeFlag(ItemTouchHelper.ACTION_STATE_DRAG, ItemTouchHelper.DOWN or ItemTouchHelper.UP or ItemTouchHelper.START or ItemTouchHelper.END) }