Staggered布局+header+分割线，addModels 后出现的问题

[LeonShannon]

描述

瀑布流布局+分割线+header，然后再添加一些数据，会导致分割线计算的时候 layoutParams 拿到是 null，导致 NPE

理由

参考实现

以下代码通过 demo 增加 header 和 addModels 可稳定复现

class StaggeredDividerFragment :
    BaseDividerFragment<FragmentStaggeredDividerBinding>(R.layout.fragment_staggered_divider) {

    override fun initView() {
        binding.rv.staggered(3, RecyclerView.VERTICAL).divider {
            setDrawable(R.drawable.divider_horizontal)
            // includeVisible = true
        }.setup {
            addType<HeaderFooterFragment.Header>(R.layout.item_header)
            addType<DividerModel>(R.layout.item_divider_vertical)
            onBind {
                when (itemViewType) {
                    R.layout.item_divider_vertical -> {
                        // 设置动态高度
                        val layoutParams = itemView.layoutParams
                        layoutParams.height = getModel<DividerModel>().height
                        itemView.layoutParams = layoutParams
                    }

                    R.layout.item_header -> {
                        val layoutParams =
                            itemView.layoutParams as? StaggeredGridLayoutManager.LayoutParams
                        layoutParams?.isFullSpan = true
                        itemView.layoutParams = layoutParams
                    }
                }

            }
        }.models = getData()
        CoroutineScope(Dispatchers.Main).launch {
            val data = mutableListOf<Any>()
            delay(500)
            data.add(DividerModel(300))
            delay(500)
            data.add(DividerModel(2000))
            binding.rv.addModels(data, index = 3)
        }
    }

    private fun getData(): List<Any> {
        val data = mutableListOf<Any>()
        // 生成动态宽高
        for (i in 0..9) {
            when (i) {
                2 -> data.add(DividerModel(400))
                3 -> data.add(DividerModel(500))
                4 -> data.add(DividerModel(700))
                5 -> data.add(DividerModel(1000))
                8 -> data.add(DividerModel(200))
                else -> data.add(DividerModel())
            }
        }
        data.add(HeaderFooterFragment.Header())
        return data
    }

    override fun initData() {
    }
}

是否可以参与实现

由于本项目参与者的技术及精力有限无法满足大部分开发者的需求, 欢迎开发者参与贡献

[liangjingkanji]

已修复在1.5.6