MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.graphics.*
import android.os.Bundle
import android.text.TextPaint
import android.widget.ImageView
class MainActivity : Activity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get the widgets reference from XML layout
val imageView = findViewById<ImageView>(R.id.imageView)
// draw text with border on canvas and get bitmap
val bitmap = drawBorderedText(
text = "ANDROID",
textSize = 300F,
strokeWidth = 30F,
textFillColor = Color.parseColor("#F0FFFF"),
textBorderColor = Color.parseColor("#333399"),
canvasColor = Color.parseColor("#A2A2D0")
)
// show drawing on image view
imageView.setImageBitmap(bitmap)
}
}
// function to draw bordered text on canvas
fun drawBorderedText(
text: String = "Text To Draw",
textSize: Float = 200F,
strokeWidth: Float = 25F,
textFillColor: Int = Color.YELLOW,
textBorderColor: Int = Color.RED,
canvasColor: Int = Color.LTGRAY
):Bitmap?{
val bitmap = Bitmap.createBitmap(
1500,
850,
Bitmap.Config.ARGB_8888
)
// canvas to draw text
val canvas = Canvas(bitmap).apply {
drawColor(canvasColor)
}
// text paint to draw text border
val paintBorder = TextPaint().apply {
isAntiAlias = true
color = textBorderColor
style = Paint.Style.STROKE
this.strokeWidth = strokeWidth
this.textSize = textSize
textAlign = Paint.Align.CENTER
}
// calculate text y offset
val textHeight = paintBorder.descent() - paintBorder.ascent()
val textOffset = textHeight / 2 - paintBorder.descent()
// calculate canvas x and y to center text
val x = canvas.width / 2F
val y = canvas.height / 2F + textOffset
// draw text border on canvas center
canvas.drawText(text, x, y, paintBorder)
// text paint to draw text fill on canvas
val paintFill = TextPaint().apply {
isAntiAlias = true
color = textFillColor
style = Paint.Style.FILL
this.textSize = textSize
textAlign = Paint.Align.CENTER
}
// draw text fill on canvas center
canvas.drawText(text, x, y, paintFill)
return bitmap
}
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"
android:id="@+id/rootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#DCDCDC"
android:padding="24dp">
<ImageView
android:id="@+id/imageView"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
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