How to compress image in Kotlin

In this android kotlin source code example, we are going to compress image 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 compress image 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.ImageViewActivity6">

    <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.drawable.BitmapDrawable
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ImageView
import com.bluapp.kotlinview.R
import android.graphics.BitmapFactory
import android.graphics.Bitmap
import android.os.AsyncTask
import java.io.ByteArrayOutputStream

class ImageViewActivity6 : AppCompatActivity() {
    var imageView: ImageView? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_image_view6)
        imageView = findViewById<ImageView>(R.id.imageView)
        ImageCompresser().execute(R.drawable.profilepic);

    }

    private inner class ImageCompresser : AsyncTask<Int, String, Bitmap>() {
        override fun doInBackground(vararg data: Int?): Bitmap? {
            var compressedBitmap: Bitmap? = null
            try {
                val drawable = getDrawable(data[0]!!)
                val bmp = (drawable as BitmapDrawable).bitmap
                val bos = ByteArrayOutputStream()
                bmp.compress(Bitmap.CompressFormat.PNG, 50, bos)
                val byteArray = bos.toByteArray()
                compressedBitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.size)
            } catch (e: Exception) {
                e.printStackTrace()
            }

            return compressedBitmap
        }
        override fun onPostExecute(bitmap: Bitmap) {
            super.onPostExecute(bitmap)
            imageView?.setImageBitmap(bitmap)
        }
    }
}

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