Kotlin/Java如何从RecyclerView内置按钮传递数据到Fragment并切换页面

步骤1：修改RecyclerView适配器，添加点击回调 #

给适配器新增按钮点击回调参数，将点击事件和对应的标题数据向外抛出，避免适配器直接操作Fragment：

class tvTitleAdapter(
    val context: Context,
    val TITLE_LIST : ArrayList<TvTitlesViewModel>,
    // 新增点击回调，返回当前项的标题
    private val onItemButtonClick: (title: String) -> Unit
) :  RecyclerView.Adapter<tvTitleAdapter.ViewHolder>() {

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

    override fun getItemCount(): Int {
        return TITLE_LIST.size
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val tvShow: TvTitlesViewModel = TITLE_LIST[position]
        holder.titleShow.text = tvShow.title
        holder.description.text = tvShow.description
        holder.showImage.setImageResource(tvShow.title_image)
        holder.tvTitleExpand.setOnClickListener {
            holder.description.visibility = View.VISIBLE
            holder.showImage.visibility = View.VISIBLE
            holder.tvTitleButton.visibility = View.VISIBLE
        }
        holder.tvTitleButton.setOnClickListener {
            // 点击按钮时将当前项的标题传给回调
            onItemButtonClick.invoke(tvShow.title)
        }
    }

    class ViewHolder(Itemview : View): RecyclerView.ViewHolder(Itemview){
        val titleShow = itemView.findViewById<TextView>(R.id.tvTitle)
        val description = itemView.findViewById<TextView>(R.id.tvDesription)
        val showImage = itemView.findViewById<ImageView>(R.id.tvImage)
        var tvTitleExpand = itemView.findViewById<CardView>(R.id.tvTitleExpand)
        val tvTitleButton = itemView.findViewById<Button>(R.id.tvTitleButton)
    }
}

步骤2：修改TvTitlesFragment，处理跳转逻辑 #

初始化适配器时传入回调实现，拿到标题后创建目标Fragment，携带参数并完成页面切换：

class TvTitlesFragment : Fragment() {
    val TV_TITLE : ArrayList<TvTitlesViewModel> = ArrayList()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_tv_titles, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        // 初始化适配器时传入回调
        val adapter = tvTitleAdapter(requireContext(), TV_TITLE) { title ->
            // 创建目标Fragment实例，传入标题
            val targetFragment = TvDetailFragment.newInstance(title)
            // 执行Fragment切换，R.id.bottom_sheet_container替换为你BottomSheet中装子Fragment的容器ID
            parentFragmentManager.beginTransaction()
                .replace(R.id.bottom_sheet_container, targetFragment)
                .addToBackStack(null) // 加入返回栈，用户点击返回可回到列表页
                .commit()
        }
        tvTitles.layoutManager = LinearLayoutManager(context, RecyclerView.VERTICAL, false)
        tvTitles.setHasFixedSize(true)
        tvTitles.adapter = adapter
        tvShowTitles()
    }

    private fun tvShowTitles(){
        TV_TITLE.add(TvTitlesViewModel(R.drawable.abdelbasset_abdessamad, "برنامج على مائدة الأفطار", "برنامج على مائدة الافطار من تقديم الشيخ علي الطنطاوي رحمه الله, تم بث أول حلقة منه في عام 1960 م واستمر الى عام1992 م"))
        // 其余添加数据逻辑保持不变
    }
}

步骤3：实现第二个接收数据的Fragment #

新建TvDetailFragment，编写参数接收和展示逻辑：

class TvDetailFragment : Fragment() {
    private val ARG_TITLE = "tv_title"
    private var currentTitle: String? = null

    companion object {
        // 统一实例创建方法，避免参数传递错误
        fun newInstance(title: String) = TvDetailFragment().apply {
            arguments = Bundle().apply {
                putString(ARG_TITLE, title)
            }
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // 取出传递的标题
        arguments?.let {
            currentTitle = it.getString(ARG_TITLE)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // 替换为你第二个Fragment的布局ID
        return inflater.inflate(R.layout.fragment_tv_detail, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        // 将标题设置到对应的TextView，替换为你布局里的标题控件ID
        view.findViewById<TextView>(R.id.detail_title).text = currentTitle
    }
}

如果你两个子Fragment是通过ViewPager/ViewPager2承载，无需replace操作，拿到标题后可以通过parentFragmentManager.setFragmentResult传值，再将ViewPager切到第二页即可。

内容的提问来源于stack exchange，提问作者Abood