MainActivity.kt
package com.cfsuman.kotlintutorials
import android.os.Bundle
import android.text.method.ScrollingMovementMethod
import android.widget.Button
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get the widgets reference from XML layout
val textView = findViewById<TextView>(R.id.textView)
val button = findViewById<Button>(R.id.button)
// make textview content scrollable
textView.movementMethod = ScrollingMovementMethod()
button.setOnClickListener {
// disable the button itself
it.isEnabled = false
val list = arrayListOf<String>("Red","Green","Blue")
list.add("Black")
list.add(1,"Magenta")
textView.text = "arrayListOf<String>()"
list.forEach{
textView.append("\n$it")
}
val list2 = ArrayList<String>()
list2.add("Red")
list2.add("Green")
list2.add("Yellow")
textView.append("\n\nArrayList<String>()")
list2.forEach{
textView.append("\n$it")
}
val list3 = arrayListOf<Any>("Red",1,2,"Green",6)
textView.append("\n\nNew List: Any")
list3.forEach{
textView.append("\n${it.toString()}")
}
}
}
}
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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F8F8F8"
android:padding="24dp">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Generate ArrayList"
android:textAllCaps="false"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="16dp"
android:fontFamily="sans-serif"
android:textSize="22sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button" />
</androidx.constraintlayout.widget.ConstraintLayout>

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