My drawable animation is not working as expected.

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Android

I have tried the drawable animation in android but it did not work. I am following this website code because it was I want exactly Drawable animation in the android Kotlin tutorial.

What I have tried:

I have tried images of all dimensions but no use. I am getting a static image.

import android.graphics.Color
import android.graphics.drawable.AnimationDrawable
import android.os.Bundle
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        view.setBackgroundColor(Color.parseColor("#737373"))

        imageView.setBackgroundResource(R.drawable.gube)
        val ani = imageView.getBackground() as AnimationDrawable
    }
}