播放主要片段中回收器视图中API的项目 我尝试显示此API的项目 API链接 https://www.themealdb.com/api/json/v1/1/categories.php 进行logcat后，所有条件都是真实和有效的，所有相应的适配器...

Question

https：//www.themealdb.com/api/json/v1/1/categories.php

uupon进行logcat所有条件都是真实的，有效的，所有相应的适配器都在调用，但项目没有在recyclerview

中显示 我已获得Intenet许可，并添加了适当的旋律依赖性，改造，毕加索用于显示图像 可能是可能的问题以及如何解决问题，任何帮助都将不胜感激。

这是我的房屋范围文件

import retrofit2.HttpException
import android.os.Bundle
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.ambrosia.Adaptors.catAdap
import com.example.ambrosia.RetroInstance
import com.example.ambrosia.databinding.FragmentHomeBinding
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import java.io.IOException


class HomeFragment : Fragment() {
    private var _binding: FragmentHomeBinding? = null
    private val binding get() = _binding!!
    private lateinit var myAdapter: catAdap
    private lateinit var rv :RecyclerView
    private val job = Job()
    private val coroutineScope = CoroutineScope(Dispatchers.Main + job)
    private var isDataLoaded = false // Track if data has been loaded

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        arguments?.let {
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        _binding = FragmentHomeBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        rv = binding.rvCategory
        rv.layoutManager =
            LinearLayoutManager(requireContext(), LinearLayoutManager.HORIZONTAL, false)
        myAdapter = catAdap(this@HomeFragment, emptyList())
        rv.adapter = myAdapter
        if (!isDataLoaded){
            Log.d("homefragment", "onViewCreated: fetchcategories called sucessfully")
            fetchCategories()
        }
    }

    private fun fetchCategories() {
        coroutineScope.launch {
            val response = try {
                RetroInstance.api.getCategory()
            } catch (e: HttpException) {
                Log.e("HomeFragment", "Http Error: ${e.message}", e)
                withContext(Dispatchers.Main) {
                    Toast.makeText(requireContext(), "Network Error", Toast.LENGTH_SHORT).show()
                }
                return@launch
            } catch (e: IOException) {
                Log.e("HomeFragment", "I/O Error: ${e.message}", e)
                withContext(Dispatchers.Main) {
                    Toast.makeText(requireContext(), "Network Error", Toast.LENGTH_SHORT).show()
                }
                return@launch
            } catch (e: Exception) {
                Log.e("HomeFragment", "Generic Error: ${e.message}", e)
                withContext(Dispatchers.Main) {
                    Toast.makeText(requireContext(), "An Error Occured", Toast.LENGTH_SHORT).show()
                }
                return@launch
            }

            withContext(Dispatchers.Main) {
                if (response.categories.isNotEmpty()) {
                    Log.d("HomeFragment", "Category list size: ${response.categories.size}")
                    myAdapter.catlist = response.categories
                    Log.d("HomeFragment", "after cat;ist called line 2")
                    myAdapter.notifyDataSetChanged()
                    Log.d("HomeFragment", "after notifydtasetchange")
                    myAdapter.onItemClick = { category ->
                        // Handle item click here
                        Log.d("HomeFragment", "Clicked on category: ${category.strCategory}")
                    }
                } else {
                    Log.w("HomeFragment", "Category list is empty")
                    Toast.makeText(requireContext(), "No Categories Found", Toast.LENGTH_SHORT).show()
                }
            }
        }
    }



    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
        job.cancel()
    }
}

这是我的回复库的适配器

package com.example.ambrosia.Adaptors

import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.RecyclerView
import com.example.ambrosia.Models.Category
import com.example.ambrosia.R
import com.squareup.picasso.Picasso


class catAdap(val context: Fragment, var catlist: List<Category>) :
    RecyclerView.Adapter<catAdap.MyViewHolder>(){


    lateinit var onItemClick: ((Category) -> Unit)


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val itemView = LayoutInflater.from(context.requireContext())
            .inflate(R.layout.itemdefine, parent, false) // Inflate your item layout
        return MyViewHolder(itemView)
    }

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

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val currentItem =catlist[position]

        Log.d("TAG", "onBindViewHolder: item displayed succesfully")
        Picasso.get()
            .load(currentItem.strCategoryThumb)
            .into(holder.img)
        Log.d("TAG", "onBindViewHolder: item displayed after picasso")


        holder.itemView.setOnClickListener {
            onItemClick.invoke(currentItem)
        }


    }
    class MyViewHolder (itemView: View) : RecyclerView.ViewHolder(itemView) {
        val img :ImageView
        init {
            img = itemView.findViewById(R.id.rvImg)
        }
    }

}

在

fetchCategory

中调整

HomeFragment

函数

Answer 1

update构造函数参数的

accessmodifier

在适配器中

catAdap

适配器中的ADD遵循方法

class catAdap(val context: Fragment, private var catlist: List<Category>) :

catAdap 现在，从片段中更新您的列表如下：

fun updateList(newList: List<Category>) {
    catlist = newList
    notifyDataSetChanged()
}