分页库，重置PageKeyedDataSource

Question

我使用Android Paging库为列表实现了无限滚动。我会根据页面的不同部分从API下载数据。我的应用程序允许用户通过向API查询中添加一些参数来过滤项目。启用过滤后，我想将parameters字段更改为PageKeyedDataSource实例并重置加载程序（我想将页面设置为1并在其中调用loadInitial方法）

DataSource(private var initialData: List<Data>, var parameters: HashMap<String, String>) : PageKeyedDataSource<Int, Data>() {


    override fun loadInitial(params: LoadInitialParams<Int>, callback: LoadInitialCallback<Int, Data>) {
        callback.onResult(initialData, null, 2)
    }

    override fun loadAfter(params: LoadParams<Int>, callback: LoadCallback<Int, Data>) {

        val page = params.key
        parameters[PAGE] = page.toString()
        val request = ApiRequest()

        request.setOnDataObtainListener {
            callback.onResult(it,page.inc())
        }

        request.getData(parameters)
    }

    override fun loadBefore(params: LoadParams<Int>, callback: LoadCallback<Int, Data>) {

    }

    fun reset(initialData: List<Data>, parameters: HashMap<String, String>) {
        this.parameters = parameters
        this.initialData = initialData
        invalidate()
    }

}

我的视图模型类

ViewModelData : ViewModel() {

    private var dataList: LiveData<PagedList<Data>>? = null
    private var dataSourceFactory: DataSourceFactory? = null

    fun loadData(initialData: List<Data>, parameters: HashMap<String, String>): LiveData<PagedList<Data>> {

        if (newsDataList == null) {
            dataSourceFactory = DataSourceFactory(initialData, parameters)

            val config = PagedList.Config.Builder()
                    .setPageSize(10)
                    .setInitialLoadSizeHint(10)
                    .setEnablePlaceholders(false)
                    .build()

            if (dataSourceFactory != null) {
                dataList = LivePagedListBuilder<Int, Data>(dataSourceFactory!!, config)
                        .setInitialLoadKey(1)
                        .build()
            }
        }

        return dataList as LiveData<PagedList<Data>>
    }

    fun reset(initialData: List<Data>,parameters: HashMap<String, String>) {
        dataSourceFactory?.dataSourceLiveData?.value?.reset(initialData,parameters)
    }}

我猜invalidate可以工作，但是无法从适配器清除PagedList。