返回绑定数据或回收者视图问题

Question

在我的片段中，我有一些图像和视图，它们通过绑定数据来获取其值，并在其下方有一个RecyclerView。图片和文本视图成功显示，但我的Recyclerview无法显示。如果仅返回视图，则显示RecyclerView，但不显示绑定的数据。我想同时查看它们。

[]

class DetailFragment : Fragment(), LessonRecyclerAdapter.LessonItemListener {

    private lateinit var viewModel: SharedViewModel
    private lateinit var recyclerView: RecyclerView

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(R.layout.fragment_detail, container, false)
        recyclerView = view.findViewById(R.id.lessonRecyclerView)
        navController = Navigation.findNavController(requireActivity(), R.id.nav_host )

        viewModel = ViewModelProvider(requireActivity()).get(SharedViewModel::class.java)
        viewModel.lessonData.observe(viewLifecycleOwner, Observer {
            val adapter =
                LessonRecyclerAdapter(
                    it,
                    this
                )
            recyclerView.adapter = adapter
        })

        // return binding data
        val binding = FragmentDetailBinding.inflate(inflater, container, false)
        binding.lifecycleOwner = this
        binding.viewModel = viewModel
        return binding.root
        //return view
    }

Answer 1

您会看到，有两种膨胀，一种用于绑定，另一种用于视图（用于recyclerview设置）。简单的解决方案是直接使用绑定变量中的recyclerview将列表设置为：

private lateinit var binding: FragmentDetailBinding

override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        navController = Navigation.findNavController(requireActivity(), R.id.nav_host )

        viewModel = ViewModelProvider(requireActivity()).get(SharedViewModel::class.java)

        binding = FragmentDetailBinding.inflate(inflater, container, false)
        binding.lifecycleOwner = this
        binding.viewModel = viewModel

        viewModel.lessonData.observe(viewLifecycleOwner, Observer {
            val adapter =
                LessonRecyclerAdapter(
                    it,
                    this
                )
            // directly access the view using ids                
            binding.lessonRecyclerView.adapter = adapter
        })

        return binding.root
    }

另一种选择是use binding adapters使用实时数据来设置适配器并将数据传递到适配器。