分页库3加载状态无法工作

Question

我有一个应用程序，可以从moviedb api中获取电影，我使用分页库3对数据进行分页，我已经设置了所有内容，数据正在正确显示，唯一在加载状态下不工作的东西，在阅读了更多关于加载状态适配器的内容后，我才知道它只在使用远程中介器从db获取数据时才能工作，我可能错了，请有人纠正我，我很感谢您的帮助。

• Code

  val layoutManager = LinearLayoutManager(this)
        binding.recyclerView.layoutManager  = layoutManager
        binding.recyclerView.setHasFixedSize(true)
        movieAdapter = TrendingMovieAdapter(object : MovieListener{
            override fun onMovieSelected(movieId: Int) {
                Intent(this@MainActivity,DetailsActivity::class.java).apply {
                    putExtra("id",movieId)
                    startActivity(this)
                }
            }
        })
        binding.recyclerView.adapter = movieAdapter.withLoadStateHeaderAndFooter(
            footer = LoaderAdapter(),
            header = LoaderAdapter()
        )


        lifecycleScope.launch {
            movieViewModel.getPagedTrendingMovies().collectLatest {
                movieAdapter.submitData(it)
            }
        }

• LoadStatesAdapter类

class LoaderAdapter : LoadStateAdapter<LoaderAdapter.ViewHolder>() {

    inner class ViewHolder(var binding : LoaderItemBinding) : RecyclerView.ViewHolder(binding.root)


    override fun onCreateViewHolder(parent: ViewGroup, loadState: LoadState): ViewHolder {
        return ViewHolder(
            DataBindingUtil.inflate(LayoutInflater.from(parent.context),
            R.layout.loader_item,parent,false)
        )
    }

    override fun onBindViewHolder(holder: ViewHolder, loadState: LoadState) {
        holder.binding.progressBar.isVisible = loadState is LoadState.Loading
    }
    

}

Answer 1

我还配置页脚加载状态适配器与您的代码相同，没有任何问题。嗯，你可以在打电话给executePendingBindings()后再打给holder.binding.progressBar.isVisible = loadState is LoadState.Loading。这是onBindViewHolder() func：override fun onBindViewHolder(holder: ViewHolder, loadState: LoadState) { holder.binding.progressBar.isVisible = loadState is LoadState.Loading executePendingBindings() }