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)
// show drawing on image view
imageView.setImageBitmap(drawTextShadow())
}
}
// function to draw text shadow on canvas
fun drawTextShadow():Bitmap?{
val bitmap = Bitmap.createBitmap(
1400,
900,
Bitmap.Config.ARGB_8888
)
// canvas for drawing
val canvas = Canvas(bitmap).apply {
drawColor(Color.parseColor("#A2A2D0"))
}
// text paint to draw text
val textPaint = TextPaint().apply {
isAntiAlias = true
color = Color.parseColor("#333399")
textSize = 280F
textAlign = Paint.Align.CENTER
typeface = Typeface.DEFAULT_BOLD
// This draws a shadow layer below the main layer,
// with the specified offset and color, and blur radius.
setShadowLayer(
20F, // radius
5F, // dx
5F, // dy
Color.parseColor("#333399") // color
)
}
// calculate center position to draw text on canvas
val x = canvas.width / 2F
val y = (canvas.height /2 ) - (textPaint.descent()
+ textPaint.ascent()) / 2
// finally, draw text with shadow on canvas
canvas.drawText(
"ANDROID",
x,
y,
textPaint
)
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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