Question

我试图在片段中使用recycleview，但是我收到“无法重新分配val”错误。我很困惑，因为我没有给出任何值，我使用了变量。我的主力军：

class KategoriFragment : Fragment() {
    var araclarKategori = ArrayList<AracMarka>()

    private lateinit var galleryViewModel: GalleryViewModel

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        galleryViewModel =
            ViewModelProviders.of(this).get(GalleryViewModel::class.java)
        var root = inflater.inflate(R.layout.fragment_category, container, false)
        rvarackategori = root.findViewById(R.id.rvarackategori) as RecyclerView
        var MyAdapter = AracMarkaAdapter(araclarKategori)
        rvarackategori.adapter = MyAdapter
        veriKaynaginiDoldur()
        return root
    }

    fun veriKaynaginiDoldur(): ArrayList<AracMarka> {

        var aracLogo = arrayOf(R.drawable.opellogo, R.drawable.chevroletlogo)
        var aracismi = resources.getStringArray(R.array.arabaisim)

        for (i in 0..araclarKategori.size - 1) {

            var eklenecekaracKategori = AracMarka(aracismi[i], aracLogo[i])
            araclarKategori.add(eklenecekaracKategori)
        }
        return araclarKategori

    }
}

这是我的适配器：

    class AracMarkaAdapter(tumKategori: ArrayList<AracMarka>) :
        RecyclerView.Adapter<AracMarkaAdapter.AracMarkaViewHolder>() {

        var araclar = tumKategori

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

            var inflater = LayoutInflater.from(parent.context)
            var arackategori = inflater.inflate(R.layout.arac_kategori, parent, false)

            return AracMarkaViewHolder(arackategori)

        }

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

        override fun onBindViewHolder(holder: AracMarkaViewHolder, position: Int) {

            holder.aracismi.text=araclar.get(position).aracAdi
            holder.aracLogo.setImageResource(araclar.get(position).aracLogo)

        }   

        class AracMarkaViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

            var teksatirKategori= itemView
            var aracismi= teksatirKategori.tvaracAdi
            var aracLogo=teksatirKategori.img_arac_sembol
}
    }

Answer 1

Loop

那条线是你的问题。您已将RecyclerView ID设置为Loop=true，当您在Kotlin中创建片段时，无需使用rvarackategori = root.findViewById(R.id.rvarackategori) as RecyclerView就可以访问布局中的视图，您只需要使用视图的ID。

因此，在这种情况下，您要按其ID访问@id/rvarackategori，然后使用findViewById查找相同的视图并尝试将其分配给自己。

尝试一下：

findViewById

在片段Val中使用RecycleView无法重新分配问题

1 个答案: