How to rotate an image in Android Kotlin

In this android kotlin source code example, we are going to rotate an 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 rotate an 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.ImageViewActivity12">

    <ImageView
        android:id="@+id/imagePreview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/profilepic"
        android:layout_marginTop="10dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

    <Button
        android:id="@+id/rotate_image"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Rotate image"
        android:background="@color/colorAccent"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"/>


</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.ImageView
import com.bluapp.kotlinview.R

class ImageViewActivity12 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_image_view12)
        val imagePreview = findViewById<ImageView>(R.id.imagePreview) as ImageView
        val rotateImage = findViewById<Button>(R.id.rotate_image) as Button
        rotateImage.setOnClickListener {
            imagePreview.rotation =45.0f
        }
    }
}

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