android - 如何在Android Kotlin上增加动态布局？

Question

我正在尝试在适配器上适应两种不同的布局，但是我没有成功，尝试了不同的方法，还在学习Kotlin语言，但是我需要创建此适配器，有人可以帮助我吗？

class AuctionAdapter(
    private val context: Context?,
    private val auctionList: List<Auction>,
    private var viewType: Int
) : RecyclerView.Adapter<AuctionAdapter.AuctionHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AuctionHolder {

        val itemView: View = if (this.viewType == 1) {
            LayoutInflater.from(parent.context).inflate(R.layout.adapter_auction, parent, false)
        } else {
            LayoutInflater.from(parent.context).inflate(R.layout.adapter_auctions, parent, false)
        }

        return AuctionHolder(itemView)
    }

    override fun getItemCount(): Int {
        return auctionList.size
    }

    class AuctionHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
}

Answer 1

您缺少一些方法，这些方法应该实现，以便使RecyclerView知道要支持的不同行类型。

首先，让我们为您要支持的其他类型添加一个新的ViewHolder。

class AuctionsHolder(itemView: View) : RecyclerView.ViewHolder(itemView)

其次，让我们将 getItemViewType添加到 AuctionAdapter

class AuctionAdapter ....

    companion object {
        const val SECTION_AUCTION = 0
        const val SECTION_AUCTIONS = 1

        @Retention(AnnotationRetention.SOURCE)
        @IntDef(SECTION_AUCTION,
                SECTION_AUCTIONS)
        annotation class Section
    }

    @Section
    override fun getItemViewType(position: Int): Int = auctionList[position].type.oridinal

最后，让我们修复 onCreateViewHolder

class AuctionAdapter(private val context: Context?, private val auctionList: List<Auction>, private var viewType: Int) : 
    RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder = when (viewType) {
                SECTION_AUCTION -> AuctionHolder(LayoutInflater.from(parent.context).inflate(R.layout.adapter_auction, parent, false))
                SECTION_AUCTIONS -> AuctionsHolder(LayoutInflater.from(parent.context).inflate(R.layout.adapter_auctions, parent, false))
                else -> throw IllegalArgumentException("Unsupported view type $viewType")
        }