Twenty-two, Kotlin advanced learning: simply learn RecyclerView to achieve list display;

1. First add the RecyclerView dependency package

implementation 'androidx.recyclerview:recyclerview:1.1.0'

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2, item list

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3, activity_main file;

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4. Add list sub-layout file list_view;

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5. Add the adapter class MyAdaptec.kt;

class MyAdapter(var context: Context,var items:List) : RecyclerView.Adapter() {// Bind the layout id hereclass ViewHolder(view: View): RecyclerView.ViewHolder(view) {val tv=view.findViewById(R.id.tv)}// bind child layoutoverride fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyAdapter.ViewHolder {val inflate = LayoutInflater.from(context).inflate(R.layout.list_view, parent, false)return ViewHolder(inflate)}// list display column numberoverride fun getItemCount(): Int =items.size// perform data assignmentoverride fun onBindViewHolder(holder: MyAdapter.ViewHolder, position: Int) {holder.tv.text=items.get(position)}}

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6. MainActivity.kt

class MainActivity : AppCompatActivity() {lateinit var recyclerView: RecyclerViewoverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)var items=ArrayList()for (item in 1..20){items.add("Kotlin learning"+item)}recyclerView=findViewById(R.id.recyclerView)recyclerView.adapter=MyAdapter(this,items)recyclerView.layoutManager=LinearLayoutManager(this)}}

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7. Running effect;