从分页库3 Android中的PagingSource加载的两个连续页面中，传递了与nextKey相同的值

编程问答 2022-07-04

问题描述

我从分页2迁移到分页3。我尝试将分页2的ItemKeyedDataSource实现到分页库3。但是我面临的问题是，在加载的两个连续页面中，传递了与nextkey相同的值（currentJodId）。然后该应用程序崩溃。但是，如果我在DataSource中添加“ keyReuseSupported = true”，则应用不会崩溃。但是它开始调用与nextkey相同的项目ID。

JobSliderRestApi.kt 

@GET("job/list/slides")
fun getDetailOfSelectedJob(
    @Query("current_job") currentJodId: Int?,@Query("limit") jobLimit: Int?,@Query("search_in") fetchType: String?
): Single<Response<JobViewResponse>>

JobViewResponse.kt 

data class JobViewResponse(
    @SerializedName("data") val data: ArrayList<JobDetail>?
) : BaseResponse()

JobDetail.kt 

data class JobDetail(
    @SerializedName("job_id") val jobId: Int,@SerializedName("tuition_type") val jobType: String?,@SerializedName("class_image") val jobImage: String,@SerializedName("salary") val salary: String,@SerializedName("no_of_student") val noOfStudent: Int,@SerializedName("student_gender") val studentGender: String,@SerializedName("tutor_gender") val preferredTutor: String,@SerializedName("days_per_week") val daysPerWeek: String?,@SerializedName("other_req") val otherReq: String?,@SerializedName("latitude") val latitude: Double?,@SerializedName("longitude") val longitude: Double?,@SerializedName("area") val area: String,@SerializedName("tutoring_time") val tutoringTime: String?,@SerializedName("posted_date") val postedDate: String?,@SerializedName("subjects") val subjects: String,@SerializedName("title") val title: String
)

JodSliderDataSource.kt 

class JodSliderDataSource @Inject constructor(
    private val jobSliderRestApi: JobSliderRestApi
): RxPagingSource<Int,JobDetail>() {

//    override val keyReuseSupported = true

    @ExperimentalPagingApi
    override fun getRefreshKey(state: PagingState<Int,JobDetail>): Int? {
        return state.anchorPosition?.let {
            state.closestItemToPosition(it)?.jobId
        }
    }

    override fun loadSingle(params: LoadParams<Int>): Single<LoadResult<Int,JobDetail>> {
        return jobSliderRestApi.getDetailOfSelectedJob(42673,2,"next").toSingle()
            .subscribeOn(Schedulers.io())
            .map { jobResponse -> toLoadResult(jobResponse.data) }
            .onErrorReturn { LoadResult.Error(it) }
    }

    private fun toLoadResult(data: ArrayList<JobDetail>): LoadResult<Int,JobDetail> {
        return LoadResult.Page(data = data,prevKey = null,nextKey = data.lastOrNull()?.jobId)
    }
}

解决方法

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android-studiopagingrx-java2