ViewUtil.java

package com.android.kickstart.utils;

import android.view.View;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.OvershootInterpolator;
import android.view.animation.Transformation;

public class ViewUtil {

    /**
     * @param view : View object for animation
     */
    public static void expandView(final View view) {
        final int targetHeight = view.getMeasuredHeight();
        // Older versions of android (pre API 21) cancel animations for views with animation height of 0.
        view.getLayoutParams().height = 1;
        view.setVisibility(View.VISIBLE);
        Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                view.getLayoutParams().height = interpolatedTime == 1
                        ? WindowManager.LayoutParams.WRAP_CONTENT
                        : (int) (targetHeight * interpolatedTime);
                view.requestLayout();
            }

            @Override
            public boolean willChangeBounds() {
                return true;
            }
        };
        // 1dp/ms
        animation.setDuration((int) (targetHeight / view.getContext().getResources().getDisplayMetrics().density));
        view.startAnimation(animation);
    }

    /**
     * @param view : View object for animation
     */
    public static void collapseView(final View view) {
        final int initialHeight = view.getMeasuredHeight();
        Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                if (interpolatedTime == 1) {
                    view.setVisibility(View.GONE);
                } else {
                    view.getLayoutParams().height = initialHeight - (int) (initialHeight * interpolatedTime);
                    view.requestLayout();
                }
            }

            @Override
            public boolean willChangeBounds() {
                return true;
            }
        };

        // 1dp/ms
        animation.setDuration((int) (initialHeight / view.getContext().getResources().getDisplayMetrics().density));
        view.startAnimation(animation);
    }

    /*
     * @param view : View object for animation
     * @param delay : Delay for view animation
     * @param duration : Duration of animation
     */
    public static void animateView(View view, long delay, long duration) {
        view.setScaleX(0);
        view.setScaleY(0);
        view.animate()
                .scaleX(1)
                .scaleY(1)
                .setDuration(duration)
                .setStartDelay(delay)
                .setInterpolator(new OvershootInterpolator())
                .start();
    }
}