使用 Paging 3 庫時出現錯誤 401 Retrofit

Question

在我嘗試使用 Paging 3 庫之前，我正在使用 Retrofit 撥打電話，我得到代碼 200 並且一切正常。然后，我嘗試實現 Paging 3 庫並使用 Retrofit ，我不知道為什么，我我收到錯誤 401。我嘗試了一些 Paging 3 示例，所有這些示例都沒有在 API 調用中使用標頭，使用 Paging 3 在 API 調用中添加標頭有什么問題嗎？ 我不確定使用標頭是否存在問題，或者我只是在實現 Paging 3 庫時做錯了什么。

我的代碼：

服務：

interface APICalls{
    @GET(MYAPIURL)
    suspend fun getData(
        @Header("Auth") auth : String,
        @Query("pageSize") pageSize:Int
    ):Response<ResponseData>
}

楷模：

data class ResponseData(
    @SerializedName("listData") val listData:MutableList<DataAPI>,
    @SerializedName("pageSize") val pageSize : Int
):Serializable

data class DataAPI(
    @SerializedName("id") val id:Int,
    @SerializedName("data")val data: String
): Serializable

結果包裝：

class Result<out T:Any>{
    data class Success<T:Any>(val value: T): Result<T>()
    data class Failure(val message:String, val errorCode:Int?):Result<Nothing>()
}

尋呼源：

val responseData = mutableListOf<DataAPI>()
class DataAPIPagingSource(private val token:String,private val apiCalls:APICalls) : PagingSource<Int,DataAPI>{
    
    override fun getRefreshKey(...):Int?{
        return null
    }
    override suspend fun load(params : LoadParams<Int>):LoadResult<Int,DataAPI>{
        return try{
            val currentPage = params.key ?: 1
            val response = apiCalls.getData(token)
            response.body()?.let{
                Result.Success(it)  
            }?: run{
                Result.Failure(response.message(),response.code())
            }
            val data = response.body()?.listData ?: emptyList()
            responseData.addAll(data)
            LoadResult.Page(responseData,if(currentPage ==1) null else -1),currentPage.plus(1)
            

        }catch(e:Exception){
            LoadResult.Error(e)
        }   
    }
}

視圖模型：

class DataViewModel(private val apiCalls:APICalls): ViewModel {

    //I get this token in shared preference
    val token = .....

    val mydata = getDataList()
        .map{pagingData -> pagingData.map{DataModel.DataItem(it)}}

    private fun getDataList(){
        return Pager(PagingConfig(25)){
            DataAPIPagingSource(token,apiCalls)
        }.flow.cachedIn(viewModelScope)
    }
}

sealed class DataModel{
    data class DataItem(val dataitem: DataAPI) : DataModel()
}

private val DataModel.DataItem.identificator : Int
    get() = this.dataItem.id

分段：

class MyFragment : Fragment(){
    private val myAdapter : DataAdapter by lazy{
        DataAdapter()
    }
    private val viewModelFactory : ViewModelFactory by inject()
    private val dataViewModel : DataViewModel by navGraphViewModels(R.id.nav_graph){viewModelFactory}


    override fun onViewCreated(...){
        super.onViewCreated(...)
        binding.myRecyclerView.apply{
            adapter = myAdapter
            layoutManager = StaggeredGridLayoutManager(1,StaggeredGridLayoutManager.VERTICAL)
            setHasFixedSize(true)
        }
        
        lyfecycleScope.launch{
            dataViewModel.mydata.collect{myAdapter.submitData(it)}
        }
    }
}

適配器：

class DataAdapter : PagingDataAdapter<DataModel,RecyclerView.ViewHolder>(DataModelComparator){

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

        val dataModel : DataModel? = getItem(position)
        dataModel.let{
            when(dataModel){
                is DataModel.DataItem ->{
                    val viewHolder = holder as DataItemViewHolder
                    viewHolder.binding.textview1.text = dataModel.dataitem.data
                }
            }
        }
    }
    override fun getItemViewType(position:Int):Int{
        return when(getItem(position)){
            is DataModel.DataItem -> R.layout.item_data
            null -> throw UnsupportedOperationException("Unknown view")
        }
    }

    override fun onCreateViewHolder(...){
        return when(viewType){
            R.layout.item_data ->{
                DataItemViewHolder(ItemDataBinding.inflate(...))
            }
        }
    }
    
    class DataItemViewHolder(val binding: DataItemBinding): RecyclerView.ViewHolder(binding.root)

    companion object {
         val DataModelComparator = object : DiffUtil.ItemCallback<DataModel>() {
            override fun areItemsTheSame(oldItem: Movie, newItem: Movie): Boolean {
                 return oldItem.dataitem.id == newItem.dataitem.id
            }

            override fun areContentsTheSame(oldItem: DataModel, newItem: DataModel): Boolean {
                return oldItem == newItem
            }
        }
    }
}

Answer 1

我認為 401 錯誤與分頁 3 無關。

您可以使用 OkHttp 攔截器 - 身份驗證器。

要旨