要解决Android分页3不显示Loadstate Adapter的问题，你可以按照以下步骤进行：

1. 确保你已经正确设置了分页逻辑和加载状态适配器。
2. 检查您的代码中是否正确处理了分页逻辑和加载状态适配器的显示。
3. 确保您的分页逻辑正确加载下一页的数据，并在加载过程中显示加载状态适配器。
4. 确保您的加载状态适配器正确显示加载中、加载完成或加载失败的状态。

以下是一些示例代码，可以帮助您解决这个问题：

首先，您需要定义一个LoadStateAdapter类，用于显示加载状态：

class LoadStateAdapter(private val retry: () -> Unit) : RecyclerView.Adapter() {

    private var loadState: LoadState = LoadState.Loading

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): LoadStateViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_load_state, parent, false)
        return LoadStateViewHolder(view)
    }

    override fun onBindViewHolder(holder: LoadStateViewHolder, position: Int) {
        holder.bind(loadState)
    }

    override fun getItemCount(): Int {
        return 1
    }

    fun setLoadState(loadState: LoadState) {
        this.loadState = loadState
        notifyDataSetChanged()
    }

    inner class LoadStateViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

        fun bind(loadState: LoadState) {
            itemView.progressBar.visibility = if (loadState == LoadState.Loading) View.VISIBLE else View.GONE
            itemView.retryButton.visibility = if (loadState == LoadState.Error) View.VISIBLE else View.GONE
            itemView.retryButton.setOnClickListener { retry.invoke() }
        }
    }
}

然后，您需要在您的Activity或Fragment中使用LoadStateAdapter类，并根据加载状态显示适当的视图：

class YourActivity : AppCompatActivity() {

    private lateinit var loadStateAdapter: LoadStateAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // 初始化RecyclerView和LayoutManager
        val recyclerView: RecyclerView = findViewById(R.id.recyclerView)
        val layoutManager: LinearLayoutManager = LinearLayoutManager(this)
        recyclerView.layoutManager = layoutManager

        // 初始化适配器和分页逻辑
        val yourAdapter = YourAdapter()
        val pagingConfig = PagingConfig(
            pageSize = 20,
            prefetchDistance = 5,
            enablePlaceholders = false
        )
        val yourPagingSource = YourPagingSource()
        val yourPagingData = Pager(pagingConfig) { yourPagingSource }.flow
            .cachedIn(lifecycleScope)
        loadStateAdapter = LoadStateAdapter { yourPagingSource.retry() }

        recyclerView.adapter = yourAdapter.withLoadStateFooter(loadStateAdapter)

        // 监听加载状态的变化
        yourAdapter.addLoadStateListener { loadState ->
            if (loadState.refresh is LoadState.Loading) {
                // 显示加载状态
                loadStateAdapter.setLoadState(LoadState.Loading)
            } else {
                // 显示加载完成或加载失败的状态
                val errorState = loadState.refresh as? LoadState.Error
                errorState?.let {
                    loadStateAdapter.setLoadState(LoadState.Error(it.error))
                } ?: loadStateAdapter.setLoadState(LoadState.NotLoading)
            }
        }

        // 开始加载数据
        lifecycleScope.launch {
            yourPagingData.collectLatest { data ->
                yourAdapter.submitData(data)
            }
        }
    }
}

请确保根据您自己的需求进行适当的修改和调整。希望这些代码示例可以帮助您解决问题！