Android 与其他片段共享recyclerview项目ID

目前，我有一个recyclerview适配器，它从数据库获取数据并将其显示在仪表板片段中。单击项目后，我希望将项目id传递给details片段，以在detailed视图中获得正确的项目信息。如何将此ID传递给详细片段

仪表板片段

class DashboardFragment : Fragment() {

    private lateinit var viewModel: DashboardViewModel

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        // Get a reference to the binding object and inflate the fragment views.
        val binding:  DashboardFragmentBinding = DataBindingUtil.inflate(
                inflater, R.layout.dashboard_fragment, container, false)

        val application = requireNotNull(this.activity).application

        val dataSource = NumberDatabase.getInstance(application).numberDatabaseDao

        val viewModelFactory = DashboardViewModelFactory(dataSource, application)


        // Get a reference to the ViewModel associated with this fragment.
        val dashboardViewModel =
                ViewModelProviders.of(
                        this, viewModelFactory).get(DashboardViewModel::class.java)

        // To use the View Model with data binding, you have to explicitly
        // give the binding object a reference to it.
        binding.dashboardViewModel = dashboardViewModel

        val adapter = CounterAdapter(CounterListener { nightId ->
            dashboardViewModel.onCountClicked(nightId)
        })


        binding.counterList.adapter = adapter

        dashboardViewModel.counts.observe(viewLifecycleOwner, Observer {
            it?.let {
                adapter.submitList(it)
            }
        })
}

适配器

class CounterAdapter (val clickListener: CounterListener): ListAdapter<Number, CounterAdapter.ViewHolder>(NightDiffCallback()) {

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bind(getItem(position)!!, clickListener)
    }


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        return ViewHolder.from(parent)
    }


    class ViewHolder private constructor(val binding: ListItemCounterBinding) : RecyclerView.ViewHolder(binding.root){

        fun bind(item: Number, clickListener: CounterListener) {
            binding.night = item
            binding.clickListener = clickListener

            binding.executePendingBindings()
        }

        companion object {
            fun from(parent: ViewGroup): ViewHolder {
                val layoutInflater = LayoutInflater.from(parent.context)
                val binding = ListItemCounterBinding.inflate(layoutInflater, parent, false)
                return ViewHolder(binding)
            }
        }
    }
}

class CounterListener(val clickListener: (nightId: Long) -> Unit) {
    fun onClick(night: Number) = clickListener(night.nightId)
    }    

class CounterAdapter（val clickListener:CounterListener）：ListAdapter（NightDiffCallback（））{
覆盖BindViewHolder（holder:ViewHolder，位置：Int）{
holder.bind（getItem（位置）！！，单击Listener）
}
override onCreateViewHolder（父级：ViewGroup，viewType:Int）：ViewHolder{
返回ViewHolder.from（父级）
}
类ViewHolder私有构造函数（val绑定：ListItemCounterBinding）：RecyclerView.ViewHolder（binding.root）{
趣味绑定（项目：编号，clickListener:CounterListener）{
binding.night=项目
binding.clickListener=clickListener
binding.executePendingBindings（）
}
伴星{
乐趣来自（父：视图组）：视图持有者{
val layoutInflater=layoutInflater.from（parent.context）
val binding=ListItemCounterBinding.inflate（LayoutFlater，parent，false）
返回视图保持器（绑定）
}
}
}
}
类计数器侦听器（val clickListener:（nightId:Long）->单位）{
fun onClick（night:Number）=clickListener（night.nightId）
}    

在你的回收视图中

 class RecipeRecyclerAdapter(
  mFragmentCommunication: FragmentCommunication
 ) :
 RecyclerView.Adapter<RecyclerView.ViewHolder>() {


 private var mFragmentCommunication: FragmentCommunication? = null


 init {
this.mFragmentCommunication =mFragmentCommunication

      }

 override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): 
  RecyclerView.ViewHolder {

        view = LayoutInflater.from(parent.context)
            .inflate(
                com.broadcast.recipeslistapp.R.layout.layout_recipe_list_item,
                parent,
                false
            )
          return RecipeViewHolder(view)

    }


  }

override fun getItemCount(): Int {
   if (mRecipes.isNullOrEmpty()) {
    return 0
   } else {
    return mRecipes!!.size
}
}

override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {


holder.itemView.setOnClickListener {
    mFragmentCommunication!!.PassNightId(nightId = 1) //value of nightId
   }

  }


interface FragmentCommunication {
fun PassNightId(nightId: Int)
}

要获取数据的片段B：

 class TestFragment  : Fragment()
{


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val nightId =arguments?.getString("nightId")

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

---

这就是如何将数据从一个片段发送到另一个片段。

使用片段的

setArguments

发送

nightId

。在片段中使用

dashboardViewModel

并观察nightId您可以共享片段和适配器的更多代码吗？我假设您想传递通过计数器获得的nightId从仪表板片段到其他片段的侦听器。如果是这样，如果其他片段与仪表板片段处于同一活动中，则可以使用接口与这些片段通信。如果共享更多代码，效果会更好。

 class TestFragment  : Fragment()
{


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val nightId =arguments?.getString("nightId")

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