Kotlin
RecyclerView in Kotlin
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Ik wil gewoon mijn kleine beetje kennis en code van RecyclerView delen met behulp van Kotlin.
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)
}
}
}
}
Modified text is an extract of the original Stack Overflow Documentation
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