android分页如何刷新数据？

Question

当dataSource改变时，如何刷新布局？如果你知道，请告诉我，谢谢。

adapter = new CollectAdapter(context, CollectionFragment.this);
    adapter.setHasStableIds(true);
    config = new PagedList.Config.Builder()
            .setPageSize(8) 
            .setEnablePlaceholders(false) 
            .setInitialLoadSizeHint(8)
            .build();
    liveData = new LivePagedListBuilder(new DataSourceFactory(), config).build();
    liveData.observe(this, new Observer<PagedList<Collection>>() {
        @Override
        public void onChanged(PagedList<Collection> collections) {
            adapter.submitList(collections);
        }
    });
    recyvleView = view.findViewById(R.id.rc_collect);
    recyvleView.addItemDecoration(new RecycleViewItemDecoration(5, 5));
    LinearLayoutManager layoutManager = new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false);
    recyvleView.setLayoutManager(layoutManager);
    recyvleView.setAdapter(adapter);

Answer 1

您可以通过调用invalidate方法更改数据源：

livedata.value.dataSource.invalidate()

Answer 2

对 Ahmed Garhy 答案的改进，可限制垃圾邮件刷卡。这仍然是一个棘手的解决方案，但提供了一些不同的用户体验。

swiperefresh.setOnRefreshListener {
  movieListAdapter.refresh()
  swiperefresh.isRefreshing = false
}

lifecycleScope.launchWhenCreated {
        adapter.addLoadStateListener { loadState ->
            //this reveals RV when loading is complete
            rv_list.isVisible = loadState.source.refresh is LoadState.NotLoading
            ///this keeps indicating that data is refreshing now
            progress_bar.isVisible = loadState.source.refresh is LoadState.Loading
            //this turns off swipeRefresh while updating
            swipe_refresh.isEnabled = loadState.source.refresh is LoadState.NotLoading
        }
    }