Kotlin
RecyclerView in Kotlin

Invoering

Hoofdklasse en adapter

Ik ga ervan uit dat je op de hoogte bent van de syntaxis van Kotlin en hoe je dit moet gebruiken, voeg gewoon RecyclerView toe in het bestand activity_main.xml en stel in met de adapterklasse.

class MainActivity : AppCompatActivity(){
    
        lateinit var mRecyclerView : RecyclerView
        val mAdapter : RecyclerAdapter = RecyclerAdapter()
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
            val toolbar = findViewById(R.id.toolbar) as Toolbar
            setSupportActionBar(toolbar)
    
            mRecyclerView = findViewById(R.id.recycler_view) as RecyclerView
    
            mRecyclerView.setHasFixedSize(true)
            mRecyclerView.layoutManager = LinearLayoutManager(this)
            mAdapter.RecyclerAdapter(getList(), this)
            mRecyclerView.adapter = mAdapter
        }
    
        private fun getList(): ArrayList<String> {
            var list : ArrayList<String> = ArrayList()
            for  (i in 1..10) { // equivalent of 1 <= i && i <= 10
                println(i)
                list.add("$i")
            }
            return list
        }
    }

deze is uw recycler view- adapterklasse en maakt het main_item.xml- bestand wat u wilt

class RecyclerAdapter : RecyclerView.Adapter<RecyclerAdapter.ViewHolder>() {

    var mItems: ArrayList<String>  = ArrayList()
    lateinit var mClick : OnClick

    fun RecyclerAdapter(item : ArrayList<String>, mClick : OnClick){
        this.mItems = item
        this.mClick = mClick;
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val item = mItems[position]
        holder.bind(item, mClick, position)
    }

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

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

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val card = view.findViewById(R.id.card) as TextView
        fun bind(str: String, mClick: OnClick, position: Int){
            card.text = str
            card.setOnClickListener { view ->
                mClick.onClickListner(position)
            }
        }
    }
}