android - 无法使用 Kotlin 协程解析回收器视图中的数据

问题描述

我正在从服务器获取数据并尝试使用协程在回收器视图中对其进行解析。虽然数据已成功获取，但我无法从嵌套的 json 中解析特定键。

这是 JSON 响应：

{
"status": "200",
"message": "Success",
"result": [
    {
        "_id": "60f516fa846e059e2f19c50c",
        "category": "Shirts",
        "sku": [
            {
                "name": "Oxford shirt",
                "brand": "John players",
                "price": "25",
                "color": "Blue",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/shi1.jpg?alt=media&token=64779194-e3b5-484f-a610-c9a20648b64c"
            },
            {
                "name": "Buttoned down",
                "brand": "Gap originals",
                "price": "45",
                "color": "Pink",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/shi2.jpg?alt=media&token=0b207b90-f1bc-4771-b877-809648e6bdc1"
            },
            {
                "name": "Collared",
                "brand": "Arrow",
                "price": "30",
                "color": "White",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/shi3.jpg?alt=media&token=2c1bb3f8-e739-4f09-acbc-aa11fed795e3"
            },
            {
                "name": "Printed",
                "brand": "John players",
                "price": "30",
                "color": "Olive green",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/shi4.jpg?alt=media&token=666f94bf-4769-44fe-a909-3c81ca9262f7"
            },
            {
                "name": "Hoodie",
                "brand": "Levis",
                "price": "44",
                "color": "Yellow",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/shi5.jpg?alt=media&token=65fccef4-a882-4278-b5df-f00eb2785bf1"
            }
        ]
    },
    {
        "_id": "60f51c37846e059e2f19c50f",
        "category": "Shoes",
        "sku": [
            {
                "name": "Sneakers",
                "brand": "Puma",
                "price": "35",
                "color": "Black and white",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/sho1.jpg?alt=media&token=d078988d-9e85-4313-bb4a-c9d46e09f0b9"
            },
            {
                "name": "Running shoe",
                "brand": "Nike",
                "price": "99",
                "color": "Multicolor",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/sho2.jpg?alt=media&token=ed2e7387-3cf6-44df-9f7d-69843eb0bcdf"
            },
            {
                "name": "Yezzy",
                "brand": "Adidas",
                "price": "349",
                "color": "Gray",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/sho3.jpg?alt=media&token=2c37ef76-37bb-4bdd-b36c-dea32857291f"
            },
            {
                "name": "Sneakers",
                "brand": "Puma",
                "price": "79",
                "color": "Black",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/sho4.jpg?alt=media&token=4acd763e-8b93-47cd-ba45-92f34af4cf83"
            },
            {
                "name": "Joyride running",
                "brand": "Nike",
                "price": "80",
                "color": "White",
                "img": "https://firebasestorage.googleapis.com/v0/b/koovs-1ff31.appspot.com/o/sho5.jpg?alt=media&token=e3780dcc-52cb-49d5-9791-e0a44870716c"
            }
        ]
    
       }
    ]
}

我想获取类别。

下面是数据类

产品.kt

data class Product(
  val message: String,
  val result: List<Result>,
  val status: String
)

结果.kt

data class Result(
  val _id: String,
  val category: String,
  val sku: List<Sku>
)

ApiService.kt

interface ApiService {

  @GET("getProducts")
  suspend fun getCategories(): Response<Product>
}

CategoriesViewModel.kt

class CategoriesViewModel: ViewModel() {

private var categoryList: MutableLiveData<List<Result>> = MutableLiveData()

fun getAllCategory(): LiveData<List<Result>> {

    viewModelScope.launch(Dispatchers.IO) {

        val retrofit = RetrofitClient.getRetrofitClient().create(ApiService::class.java)
        val response = retrofit.getCategories()

        if (response.isSuccessful) {
            categoryList.postValue(response.body()!!.result)
        }
    }
    return categoryList
  }
}

类别适配器.kt

class CategoryAdapter(private val context: Context,private val categories:List<Result>): RecyclerView.Adapter<CategoryAdapter.ViewHolder>() {

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CategoryAdapter.ViewHolder {
   return ViewHolder(ParentRowBinding.inflate(LayoutInflater.from(parent.context),parent,false))
}

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

    val model = categories[position]
    holder.binding.catTitle.text = model.category
}

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

class ViewHolder(val binding:ParentRowBinding): RecyclerView.ViewHolder(binding.root)
}

HomeFragment.kt

class HomeFragment : Fragment() {

private var binding: FragmentHomeBinding? = null
private lateinit var adapter: CategoryAdapter

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    // Inflate the layout for this fragment
    binding = FragmentHomeBinding.inflate(inflater,container,false)

    binding!!.parentRecycler.setHasFixedSize(true)
    binding!!.parentRecycler.layoutManager = LinearLayoutManager(activity)

    val viewModel = ViewModelProvider(this).get(CategoriesViewModel::class.java)

    viewModel.getAllCategory().observe(viewLifecycleOwner, Observer { t ->

        val len = t.size

        if(len > 0){

            for(i in 0 until len){
                Log.d("hell", t[i].category.toString())
            }
        }
    })

    return binding!!.root
}

override fun onDestroy() {
    super.onDestroy()
    binding = null
}
}

在这里，我以某种方式获取了类别，但我不知道如何将其传递给适配器，以便可以在 recyclerview 中显示它。

标签： androidjsonkotlinkotlin-coroutinesandroid-mvvm

android - 无法使用 Kotlin 协程解析回收器视图中的数据

问题描述

解决方案

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