分页库3加载状态不工作

Question

我有一个从moviedbapi获取电影的应用程序，我使用分页库3来分页数据，我已经设置好了所有内容，数据显示正确，唯一在加载状态下不起作用的是，在阅读了更多关于加载状态适配器的信息后，我知道它只在使用远程中介器后从db获取数据时起作用，我可能错了，请有人纠正我，如果有任何帮助，我将不胜感激。。

• 代码

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

我还配置了页脚加载状态适配器，与您的代码相同，没有任何错误。嗯，你可以试着在呼叫holder.binding.progressBar.isVisible = loadState is LoadState.Loading之后再呼叫executePendingBindings()。这是onBindViewHolder()函数：override fun onBindViewHolder(holder: ViewHolder, loadState: LoadState) { holder.binding.progressBar.isVisible = loadState is LoadState.Loading executePendingBindings() }