MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.os.Bundle
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 button = findViewById<Button>(R.id.button)
val listView = findViewById<ListView>(R.id.listView)
val textView = findViewById<TextView>(R.id.textView)
// list to populate list view
val list = mutableListOf(
"Golden yellow",
"Han purple",
"Hansa yellow",
"Jazzberry jam",
"Jungle green",
"Lavender blush",
"Lawn green"
)
// initialize an array adapter
val adapter:ArrayAdapter<String> = object: ArrayAdapter<String>(
this,
android.R.layout.simple_dropdown_item_1line,
list
){
override fun isEnabled(position: Int): Boolean {
// disable adapter fifth item at array adapter initialization
// this actually disable list view item click
return position != 4
}
override fun getView(position: Int, convertView: View?,
parent: ViewGroup): View {
val tv = super.getView(position,
convertView, parent) as TextView
// show the disable text color for fifth item
// this actually not disable the list view item click
tv.isEnabled = position != 4
return tv
}
}
// attach the array adapter with list view
listView.adapter = adapter
// list view item click listener
listView.onItemClickListener = AdapterView.OnItemClickListener {
parent, view, position, id ->
val selectedItem = parent?.getItemAtPosition(position)
.toString()
textView.text = selectedItem
}
// disable list view third item on button click
button.setOnClickListener {
// disable the button itself
it.isEnabled = false
// disable the third item of list view
val view = listView.getChildAt(2)
view.setOnClickListener { }
view.isEnabled = false
}
}
}
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">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Disable Third Item"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ListView
android:id="@+id/listView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="24dp"
app:layout_constraintBottom_toTopOf="@+id/textView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/button" />
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Select your favorite color"
android:fontFamily="sans-serif"
android:gravity="center"
android:textColor="#333399"
android:textSize="24sp"
android:textStyle="italic"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>


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