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现在我有一个功能性的向左滑动以在具有两种布局（前景和背景）的 recyclerview 中删除。我在代码中使用了 itemtouchhelper。但是，我希望向左滑动和向右滑动都显示不同的颜色和图标，就像在 Google 收件箱中一样。我该如何实施？

我想要的是： 向右滑动向左滑动

我所拥有的是： 只向右滑动

该代码只是标准的 itemtouchhelper.simplecallback，在 xml 中有 2 个布局。而且我到处搜索，只发现带有单一图标和单一颜色的单一滑动选项

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1 回答 1

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使用ItemTouchHelper实现 Gmail Like 功能

设置recyclerView后调用如下函数

private fun initSwipe() {
        val simpleItemTouchCallback = object : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT) {

            override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
                return false
            }

            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                val position = viewHolder.adapterPosition

                if (direction == ItemTouchHelper.LEFT) {

                   //Logic to do when swipe left

                } else {

                  //Logic to do when swipe right

                }
            }

            override fun onChildDraw(c: Canvas, recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, dX: Float, dY: Float, actionState: Int, isCurrentlyActive: Boolean) {


                val icon: Bitmap
                if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {


       //Drawing for Swife Right    

                    val itemView = viewHolder.itemView
                    val height = itemView.bottom.toFloat() - itemView.top.toFloat()
                    val width = height / 3
                    if (dX > 0) {
                        p.color = Color.parseColor("#2F2FD3")
                        val background = RectF(itemView.left.toFloat(), itemView.top.toFloat(), dX, itemView.bottom.toFloat())
                        c.drawRect(background, p)
                        icon = BitmapFactory.decodeResource(resources, R.drawable.ic_archive)
                        val icon_dest = RectF(itemView.left.toFloat() + width, itemView.top.toFloat() + width, itemView.left.toFloat() + 2 * width, itemView.bottom.toFloat() - width)
                        c.drawBitmap(icon, null, icon_dest, p)
                    } else {

       //Drawing for Swife Left


                        p.color = Color.parseColor("#D32F2F")
                        val background = RectF(itemView.right.toFloat() + dX, itemView.top.toFloat(), itemView.right.toFloat(), itemView.bottom.toFloat())
                        c.drawRect(background, p)
                        icon = BitmapFactory.decodeResource(resources, R.drawable.ic_delete)
                        val icon_dest = RectF(itemView.right.toFloat() - 2 * width, itemView.top.toFloat() + width, itemView.right.toFloat() - width, itemView.bottom.toFloat() - width)
                        c.drawBitmap(icon, null, icon_dest, p)
                    }
                }
                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
            }
        }
        val itemTouchHelper = ItemTouchHelper(simpleItemTouchCallback)
        itemTouchHelper.attachToRecyclerView(YOUR_RECYCLER_VIEW)
    }

对象 p 是油漆对象Paint p = new Paint() 希望这可以帮助你。

于 2018-04-24T11:39:00.883 回答