Question

我阅读了一些有关将cyclingview用于活动的文档。现在，我尝试对我的片段使用recycleview。问题是执行时我的片段看上去是空的。

片段：

string DelimitedUserIds = "9,3,12,43,2"
List<int> UserIds = DelimitedUserIds .Split(',').Select(int.Parse).ToList();

} 我创建一个适配器。我认为没有问题。适配器：

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


private lateinit var galleryViewModel: GalleryViewModel

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    veriKaynaginiDoldur()
    galleryViewModel =
      ViewModelProviders.of(this).get(GalleryViewModel::class.java)
    var root = inflater.inflate(R.layout.fragment_category, container, false)
    veriKaynaginiDoldur()
    var rvarackategori = root.findViewById(R.id.rvarackategori) as RecyclerView
    var MyAdapter = AracMarkaAdapter(araclarKategori)
    rvarackategori.adapter = MyAdapter

    /

    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 until min(aracismi.size, aracLogo.size)) {

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

}

片段xml：

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

    }
}

因此，当我单击按钮时，片段会打开，但它是空的。你有什么想法吗？

Answer 1

在修改veriKaynaginiDoldur()中列表中的数据之后，您需要调用myAdapter.notifyDataSetChanged()，以便知道重新绑定数据。或者，您可以在实例化适配器之前调用veriKaynaginiDoldur()。

编辑：您的另一个错误是在veriKaynaginiDoldur()中的for循环中。您正在使用araclarKategori列表的大小（当其仍为零时）进行范围划分。

代替

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

使用

for (i in 0 until min(aracLogo.size, aracismi.size))

Answer 2

您必须在以下代码后调用此veriKaynaginiDoldur（）函数我提到的以下代码行请检查
    var rvarackategori = root.findViewById(R.id.rvarackategori) as RecyclerView
    var MyAdapter = AracMarkaAdapter(araclarKategori)
    rvarackategori.adapter = MyAdapter
    veriKaynaginiDoldur()

在Android中使用RecycleView

2 个答案: