如何清除/删除页面列表适配器中的所有项目 [英] How to clear/remove all items in page list adapter

问题描述

我正在使用android分页库显示搜索结果项，有什么办法可以清除/删除所有已加载的结果项，在活动的分页列表上调用Invalidate刷新列表，而不清除/删除项

I'm using the android paging library to show search result items, is there any way I can clear/remove all the loaded result items, Calling Invalidate on live Paged List refreshing the list not clear/remove items

In Activity: 
 fun clearSearchResult() {
        if (productSearchResultItemAdapter.itemCount > 0) {
            viewModel.invalidateResultList()
        }
    }


In ViewModel
 private fun searchProductByTerm(searchTerm: String): Listing<Item> {
        sourceFactory = ProductSearchItemDataSourceFactory(productSearchUC, compositeDisposable, searchTerm, resourceResolver)

        val livePagedList = LivePagedListBuilder(sourceFactory, pagedListConfig)
                //The executor used to fetch additional pages from the DataSource
                .setFetchExecutor(getNetworkExecutor())
                .build()

        return Listing(
                pagedList = livePagedList,
                networkState = switchMap(sourceFactory.sourceLiveData) {
                    it.networkState
                },
                retry = {
                    sourceFactory.sourceLiveData.value?.retryAllFailed()
                }
        )

    }


    fun invalidateResultList() {
        sourceFactory?.sourceLiveData?.value?.invalidate()
    }

private val productSearchName = MutableLiveData<String>()
    private val repoResult = map(productSearchName) {
        searchProductByTerm(it)
    }

推荐答案

提交null清除当前加载的页面列表

submitting null clear the currently loaded page list

  productSearchResultItemAdapter.submitList(null)

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