MainActivity.kt
package com.example.jetpack
import android.graphics.Color
import android.graphics.Paint
import android.graphics.drawable.ShapeDrawable
import android.graphics.drawable.shapes.RectShape
import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// add a border around text view
textView.addBorder(Color.RED, 20F)
}
}
// extension function to add border to text view programmatically
fun TextView.addBorder(
color : Int = Color.GRAY,
width : Float = 10F
){
// initialize a shape drawable
val drawable = ShapeDrawable().apply {
// specify the shape of shape drawable
shape = RectShape()
paint.apply {
// specify the border color of shape
this.color = color
// set the border width
strokeWidth = width
// specify the style is a Stroke
style = Paint.Style.STROKE
}
}
// finally, add the shape drawable background to text view
background = drawable
}
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:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#EDEAE0"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="25dp"
android:text="Sample TextView"
android:textSize="30sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

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