MainActivity.kt
package com.cfsuman.kotlinexamples
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.TextView
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.text_view)
val button = findViewById<Button>(R.id.button);
val button2 = findViewById<Button>(R.id.button2);
val button3 = findViewById<Button>(R.id.button3);
// When statement example
button.setOnClickListener{
// Initialize an integer type variable
var number:Int = 3
when(number){
1 -> textView.text = "Value is 1"
2 -> textView.text = "Value is 2"
3 -> textView.text = "Value is 3"
else -> textView.text = "Value is not between 1 and 3"
}
}
// When statement example
button2.setOnClickListener{
// Initialize an integer type variable
var number:Int = 4
when(number){
0,1 -> textView.text = "Value is 0 or 1"
2 -> textView.text = "Value is 2"
3,4,5 -> textView.text = "Value is 3 or 4 or 5"
else -> textView.text = "Value is not between 0 and 5"
}
}
// When statement example
button3.setOnClickListener{
// Initialize an integer type variable
var number:Int = 51
when(number){
in 1..10 -> textView.text = "Value is between 1 and 10"
!in 11..50 -> textView.text = "Value is not between 10 and 50"
else -> textView.text = "Value is unknown"
}
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/root_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="16dp"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="When statement"
/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Another When"
/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="When Again"
/>
<TextView
android:id="@+id/text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=""
android:textSize="18sp"
android:textStyle="bold"
android:textColor="#ff191d"
android:layout_marginTop="20dp"
/>
</LinearLayout>



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