MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.content.Context
import android.os.Bundle
import android.util.TypedValue
import android.view.View
import android.view.ViewGroup
import android.widget.*
class MainActivity : Activity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get the widgets reference from XML layout
val listView = findViewById<ListView>(R.id.listView)
// list to populate list view
val list = mutableListOf(
"Black bean",
"Black coffee",
"Black chocolate",
"Canary yellow",
"Champagne pink",
"Congo pink"
)
// initialize an array adapter
val adapter:ArrayAdapter<String> = object: ArrayAdapter<String>(
this,
android.R.layout.simple_dropdown_item_1line,
list
){
override fun getView(position: Int, convertView: View?,
parent: ViewGroup): View {
val textView:TextView = super.getView(position,
convertView, parent) as TextView
// set list view item height programmatically
textView.layoutParams.height = 90.toDp(context)
return textView
}
}
// attach the array adapter with list view
listView.adapter = adapter
}
}
// extension method to convert values to dp
fun Int.toDp(context: Context):Int = TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP,
this.toFloat(),
context.resources.displayMetrics
).toInt()
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rootLayout"
android:background="#DCDCDC"
android:padding="24dp">
<ListView
android:id="@+id/listView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

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