How to draw image on Canvas in Kotlin

In this android kotlin source code example, we are going to draw image on Canvas in Android Kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to draw image on Canvas in Android Kotlin.

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"
    tools:context=".imageView.ImageViewActivity8">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.graphics.Canvas
import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ImageView
import com.bluapp.kotlinview.R



class ImageViewActivity8 : AppCompatActivity() {
    var BitmapSize = 40
    var imageView: ImageView?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_image_view8)
        imageView = findViewById<ImageView>(R.id.imageView) as ImageView
        imageOnCanvas()

    }

    private fun imageOnCanvas(){
        val bitmapiamge = BitmapFactory.decodeResource(resources, R.drawable.profilepic)
        val width = bitmapiamge.getWidth() + BitmapSize * 2
        val height = bitmapiamge.getHeight() + BitmapSize * 2
        val bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565)
        val canvas = Canvas(bitmap)
        canvas.drawColor(Color.GREEN)
        canvas.drawBitmap(bitmapiamge, BitmapSize.toFloat(), BitmapSize.toFloat(), null)
        imageView?.setImageBitmap(bitmap);
    }
}

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