LayoutTransition Animation

package com.example.android.interactivechart;
import android.animation.Animator;
import android.animation.LayoutTransition;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
public class ScaleActivity extends Activity {

    LinearLayout mContainer;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scale);
        LayoutTransition transition = new LayoutTransition();
        mContainer = (LinearLayout) findViewById(R.id.verticalContainer);
        mContainer.setLayoutTransition(transition);

        // Appearing
        ObjectAnimator appearAnim = ObjectAnimator.ofFloat(null, "rotationY", 90f, 0).setDuration(transition.getDuration(LayoutTransition.APPEARING));
        transition.setAnimator(LayoutTransition.APPEARING, appearAnim);

        // Disappearing
        ObjectAnimator disappearAnim = ObjectAnimator.ofFloat(null, "rotationY", 0f, 90f).setDuration(transition.getDuration(LayoutTransition.DISAPPEARING));
        transition.setAnimator(LayoutTransition.DISAPPEARING, disappearAnim);

        PropertyValuesHolder pvhSlide = PropertyValuesHolder.ofFloat("y",0f);
        PropertyValuesHolder pvhScaleY = PropertyValuesHolder.ofFloat("scaleY", 1f, 0.5f, 1f);
        PropertyValuesHolder pvhScaleX = PropertyValuesHolder.ofFloat("scaleX", 1f, 0.5f, 1f);
        Animator changingAppearingAnim = ObjectAnimator.ofPropertyValuesHolder(this, pvhSlide, pvhScaleY, pvhScaleX);
        changingAppearingAnim.setDuration(transition.getDuration(LayoutTransition.CHANGE_DISAPPEARING));
        transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING, changingAppearingAnim);
        transition.setAnimator(LayoutTransition.CHANGE_APPEARING, changingAppearingAnim);
    }

    //Add a new button that can remove itself
    public void onAddClick(View v) {
//        PropertyValuesHolder pvhSlide = PropertyValuesHolder.ofFloat("y", 0f, 60f);
//        Animator changingAppearingAnim = ObjectAnimator.ofPropertyValuesHolder(v, pvhSlide).setDuration(2000);
//        changingAppearingAnim.start();

        Button button = new Button(this);
        button.setText("Click To Remove");
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mContainer.removeView(v);
            }
        });

        mContainer.addView(button, new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
    }
}