MainActivity.kt
package com.cfsuman.kotlintutorials
import android.os.Bundle
import android.text.method.ScrollingMovementMethod
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)
// make textview content scrollable
textView.movementMethod = ScrollingMovementMethod()
val string = "Lorem Ipsum is simply dummy text of the" +
" printing and typesetting industry."
textView.text = string
// Removes the part of a string at the given range.
// The end index of the range is included in the removed part.
val result = string.removeRange(
10..50 // range
)
textView.append("\n\n\n")
textView.append("After removing range (10..50)....\n")
textView.append(result)
/*
documentation source kotlinlang.org
Removes the part of a string at a given range.
startIndex - the index of the first character to be removed.
endIndex - the index of the first character after
the removed part to keep in the string.
endIndex is not included in the removed part.
*/
val result2 = result.removeRange(
5, // start index
25 // end index
)
textView.append("\n\n\n")
textView.append("Removing from result" +
" (start index 5, end index 25)....\n")
textView.append(result2)
}
}
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">
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="0dp"
android:fontFamily="sans-serif"
android:textSize="24sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
