how to slide_down animation in android

res/animation/slide_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true">

    <scale
        android:duration="1000"
        android:fromXScale="1.0"
        android:fromYScale="0.0"
        android:toXScale="1.0"
        android:toYScale="1.0" />

</set>
res/layout/activity_slide_down.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
   
    <ImageView android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher/>
   
    <Button android:id="@+id/btn_Start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Start Animation/>
   
</RelativeLayout>

MainActivity.java

package example.animations;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements AnimationListener {

    ImageView image;
    Button btn_Start;
    Animation animationSlide_down;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_slide_down);

        image= (ImageView) findViewById(R.id.image);
        btn_Start= (Button) findViewById(R.id.btn_Start);

      
        animationRotate= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.slide_down);
        animationRotate.setAnimationListener(this);

        btn_Start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            
               image.startAnimation(animationSlide_down);
            }
        });

    }

    @Override
    public void onAnimationEnd(Animation animation) {
             if (animation == animationSlide_down) {
        }

    }
    @Override
    public void onAnimationRepeat(Animation animation) {
        // TODO Auto-generated method stub

    }
    @Override
    public void onAnimationStart(Animation animation) {
        // TODO Auto-generated method stub

    }

}