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);
// A simple string variable
var city = "Khulna"
// Loop through the string characters using withIndex library function
button.setOnClickListener{
textView.text = "Loop string [$city] using withIndex library function \n\n"
for ((index,value) in city.withIndex()){
textView.text = textView.text.toString() + "index = $index, value = $value \n"
}
}
// Loop through the string characters
button2.setOnClickListener{
textView.text = "Loop through the string [$city] characters \n\n"
for (letter in city){
textView.text = textView.text.toString() + "$letter \n"
}
}
}
}
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="Loop String Using WithIndex Library"
/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Loop String normally"
/>
<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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