android - 删除所选单元格的拖放

Question

我已经为我的回收站 View 创建了拖放操作，但我想在拉取单元格时禁用拖放选项(在我的 View 中它是一个标题)。如何使它们不能用于拖放功能？

拖放助手

class SimpleItemTouchHelperCallback(private val mAdapter: ItemTouchHelperAdapter) : ItemTouchHelper.Callback() {
    override fun isLongPressDragEnabled() = true

    override fun isItemViewSwipeEnabled() = true

    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {}

    override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int {
        val dragFlags = ItemTouchHelper.UP or ItemTouchHelper.DOWN
        val swipeFlags = ItemTouchHelper.START or ItemTouchHelper.END

        return ItemTouchHelper.Callback.makeMovementFlags(dragFlags, swipeFlags)
    }

    override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
        mAdapter.onItemMove(viewHolder.adapterPosition, target.adapterPosition)

        return true
    }
}

Recyclerview 适配器

interface ItemTouchHelperAdapter {
    fun onItemMove(fromPosition: Int, toPosition: Int): Boolean
}

将适配器与 rv 配对的代码

val drugAndDropHandler = SimpleItemTouchHelperCallback(adapter)
ItemTouchHelper(drugAndDropHandler).attachToRecyclerView(multiple_stores_list)

Answer 1

只需要覆盖getMovementFlags

override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int {
    if (viewHolder.adapterPosition in 0..NOT_DRAGABLE_ITEMS_MAX_POSITION) {
        return 0
    }
}