ImageView и анимация

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.Transformation;
 
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.button).setOnClickListener(this);
    }
 
    @Override
    public void onClick(View v) {
        final View iv = findViewById(R.id.imageView);
        final View parent = (View) iv.getParent();
        final int destMargin = parent.getWidth() - iv.getWidth() / 2 - iv.getLeft();
        Animation a = new Animation() {
            @Override
            protected void applyTransformation(float time, Transformation t) {
                ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) iv.getLayoutParams();
                lp.leftMargin = (int) (destMargin * time);
                iv.setLayoutParams(lp);
            }
        };
        a.setDuration(2000);
        iv.startAnimation(a);
    }
}