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);
// Loop through a range using do while loop
button.setOnClickListener{
// Initialize an integer type variable
var i:Int = 1
textView.text = "Loop through range 1 to 10 using do while loop \n\n"
// Simple do while loop through a range
do{
textView.text = textView.text.toString() + "$i \n"
i++ // Increment the value
}while(i <= 10) // First execute code then check the condition
}
// Loop through another range using do while loop
button2.setOnClickListener{
// Initialize an integer type variable
var index:Int = 15
textView.text = "Loop range using do while loop condition fail \n\n"
// Simple do while loop through a range
do{
/*
Do while loop at first execute the code then check the condition.
So the first number will be displayed in text view.
Because it pass before condition checking.
*/
textView.text = textView.text.toString() + "$index \n"
index++ // Increment the value
}while(index <= 10) // First execute code then check the condition
}
// Loop through a range using do while loop and break at number 5
button3.setOnClickListener{
// Initialize an integer type variable
var i:Int = 1
textView.text = "Loop through range 1 to 10 using do while loop and break at 5 \n\n"
// Simple do while loop through a range
do{
textView.text = textView.text.toString() + "$i \n"
if(i == 5)
break
i++ // Increment the value
}while(i <= 10) // First execute code then check the condition
}
}
}
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="Do While Loop"
/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Another Do While Loop"
/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Do While Loop Break"
/>
<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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