Implementing onItemClickLitsner recyclerView Kotlin -android

Question

我在Kotlin編寫我的第一個Android應用程序，我試圖在android studio 3.0中使用kotlin在RecyclerView中實現onItemClickListner，但是我找不到任何有用的東西。所以我有movieListFRagment：

class MoviesListFragment : Fragment() {  
    private var mListener: OnFragmentInteractionListener? = null 
    private var movieList = ArrayList<Movies>() 
    private var mAdapter: MoviesRecyclerAdapter? = null  
    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, 
           savedInstanceState: Bundle?): View? { 
     // Inflate the layout for this fragment 
     return inflater!!.inflate(R.layout.fragment_movies_list, container, false) 
    }  
    override fun onViewCreated(view: View?, savedInstanceState: Bundle?) { 
     super.onViewCreated(view, savedInstanceState)  
     mAdapter = MoviesRecyclerAdapter(movieList) 
     val mLayoutManager = LinearLayoutManager(this.activity)  
     recyclerView!!.layoutManager = mLayoutManager 
     recyclerView!!.itemAnimator = DefaultItemAnimator() 
     recyclerView!!.adapter = mAdapter  
     prepareMoviesData() } 

    interface OnFragmentInteractionListener { 
     // TODO: Update argument type and name 
     fun onFragmentInteraction(uri: Uri) 
    }  
    private fun prepareMoviesData() { 
     var movie = Movies("Mad Max: Fury Road", "Action & Adventure", "2015") 
     movieList.add(movie)  
     movie = Movies("Inside Out", "Animation, Kids & Family", "2015") 
     movieList.add(movie) 
     movie = Movies("Star Wars:The Force Awakens", "Action", "2015") 
     movieList.add(movie) 
     mAdapter!!.notifyDataSetChanged() 
    } 
} 

和適配器MoviesRecyclerAdapter：

class MoviesRecyclerAdapter(private val moviesList: List<Movies>) : RecyclerView.Adapter<MoviesRecyclerAdapter.MyViewHolder>() { 


    class MyViewHolder(view: View ) : RecyclerView.ViewHolder(view) ,View.OnClickListener { 

     var title: TextView = view.findViewById<TextView>(R.id.title) 
     var year: TextView = view.findViewById<TextView>(R.id.year) 
     var genre: TextView = view.findViewById<TextView>(R.id.genre) 
    } 

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder { 
     val itemView = LayoutInflater.from(parent.context) 
       .inflate(R.layout.movie_list_row, parent, false) 

     return MyViewHolder(itemView) 
    } 

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) { 
     val Movies = moviesList[position] 
     holder.title.text = Movies.title 
     holder.genre.text = Movies.genre 
     holder.year.text = Movies.year 

    } 

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

我需要當用戶單擊列表中的項目可打開的其他活動，什麼是清潔和最佳這樣做的方式。

Answer 1

您可以使用lambda作爲點擊回調，例如，爲您的適配器的類屬性：

var onItemClick: (Int) -> Unit = {} 

然後在onCreateViewHolder：

itemView.setOnClickListener { 
    onItemClick(viewHolder.getAdapterPosition()) 
} 

不要忘記設置您的片段回調：

adapter.onClick = { position -> 
    // do something here 
}