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
import kotlin.math.min
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)
// show drawing on image view
imageView.setImageBitmap(drawTextOnPath())
}
}
// function to draw text on path on canvas
fun drawTextOnPath():Bitmap?{
val bitmap = Bitmap.createBitmap(
1400,
900,
Bitmap.Config.ARGB_8888
)
// canvas for drawing
val canvas = Canvas(bitmap).apply {
drawColor(Color.parseColor("#A2A2D0"))
}
// paint to draw path
val paint = Paint().apply {
isAntiAlias = true
color = Color.parseColor("#333399")
strokeWidth = 125F
style = Paint.Style.STROKE
}
// add circle to path
val path = Path()
path.addCircle(
canvas.width/2F,
canvas.height/2F,
min(canvas.width,canvas.height)/2 - 100F,
Path.Direction.CCW
)
// draw path on canvas
canvas.drawPath(path, paint)
// text paint to draw text on path
val textPaint = TextPaint().apply {
isAntiAlias = true
color = Color.parseColor("#F0FFFF")
textSize = 80F
}
// finally, draw text on path
canvas.drawTextOnPath(
"Android Development", // text to draw
path, // path the text should follow for its baseline
// distance along the path to add
// to the text's starting position
1250F,
// distance above(-) or below(+) the
// path to position the text
30F,
textPaint // paint
)
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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