“Pas assez d'informations pour en déduire le paramètre T” avec Kotlin et Android

Andoid O changement findViewById api de

la Vue du public findViewById(int id);

à

public final T findViewById(int id)

donc, si vous êtes la cible d'API 26, vous pouvez modifier

val listView = findViewById(R. id.liste) que ListView

à

val listView = findViewById(R. id.liste)

ou

val listView: ListView = findViewById(R. id.liste)

Modifier votre code pour cela. Où les principaux changements survenus sont marquées par des astérisques.

package com.phenakit.tg.phenakit
import android.content.Context
import android.os.Bundle
import android.support.design.widget.BottomNavigationView
import android.support.v7.app.AppCompatActivity
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.ListView
import android.widget.TextView
public class MainActivity : AppCompatActivity() {
private var mTextMessage: TextView? = null
private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.navigation_home -> {
mTextMessage!!.setText(R.string.title_home)
return@OnNavigationItemSelectedListener true
}
R.id.navigation_dashboard -> {
mTextMessage!!.setText(R.string.title_dashboard)
return@OnNavigationItemSelectedListener true
}
R.id.navigation_notifications -> {
setContentView(R.layout.activity_list_view)
return@OnNavigationItemSelectedListener true
}
}
false
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mTextMessage = findViewById(R.id.message) as TextView?
val navigation = findViewById(R.id.navigation) as BottomNavigationView
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
**val listView = findViewById<ListView>(R.id.list)**
**listView?.adapter = ListExampleAdapter(this)**
}
private class ListExampleAdapter(context: Context) : BaseAdapter() {
internal var sList = arrayOf("Eins", "Zwei", "Drei")
private  val mInflator: LayoutInflater
init {
this.mInflator = LayoutInflater.from(context)
}
override fun getCount(): Int {
return sList.size
}
override fun getItem(position: Int): Any {
return sList[position]
}
override fun getItemId(position: Int): Long {
return position.toLong()
}
override fun getView(position: Int, convertView: View?, parent: ViewGroup): View? {
val view: View?
val vh: ListRowHolder
if(convertView == null) {
view = this.mInflator.inflate(R.layout.list_row, parent, false)
vh = ListRowHolder(view)
view.tag = vh
} else {
view = convertView
vh = view.tag as ListRowHolder
}
vh.label.text = sList[position]
return view
}
}
private class ListRowHolder(row: View?) {
public var label: TextView
**init { this.label = row?.findViewById<TextView?>(R.id.label) as TextView }**
}
}