Android studio 在从分页库3中的分页源加载的两个连续页面中，传递了与nextKey相同的值

我从第2页迁移到第3页。我尝试将分页2的ItemKeyedDataSource实现为分页库3。但我面临的问题是，在两个连续加载的页面中传递了与nextkey相同的值（currentJodId）。在应用程序崩溃之后。但若我在数据源中添加“keyReuseSupported=true”，应用程序不会崩溃。但它开始调用与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>>

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

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
)

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)
    }
}

JobDetail.kt

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

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

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
)

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)
    }
}

JodSliderDataSource.kt

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

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

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
)

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)
    }
}

class JodSliderDataSource@Inject构造函数(
private val jobSliderRestApi:jobSliderRestApi
)：RxPagingSource（）{
//override val keyReuseSupported=真
@阿帕金加皮实验酒店
覆盖fun getRefreshKey（状态：PagingState）：Int{
返回状态。锚定位置？让{
state.closestItemToPosition（it）？.jobId
}
}
覆盖有趣的loadSingle（参数：LoadParams）：Single{
返回jobSliderRestApi.getDetailOfSelectedJob（42673，2，“next”）.toSingle（）
.subscribeOn（Schedulers.io（））
.map{jobResponse->toLoadResult（jobResponse.data）}
.onErrorReturn{LoadResult.Error（it）}
}
private fun toLoadResult（数据：ArrayList）：LoadResult{
返回LoadResult.Page（数据=数据，prevKey=null，nextKey=data.lastOrNull（）？.jobId）
}
}

您正在此处设置nextKey:

nextKey=data.lastOrNull（）？.jobId

。请确保您没有在此处两次返回同一密钥-如果没有更多可加载的密钥，您的后端API是否会将密钥返回给您？在这种情况下，您需要检查并返回

null

。@dlam感谢brother的回复。我哥哥还好。可能是我犯了什么错误implementing@AminulHaqueAome您好，您找到这个问题的解决方案了吗？@amrismail no brother