ViewUtils.java

import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateDecelerateInterpolator;

import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.IntEvaluator;
import com.nineoldandroids.animation.ObjectAnimator;
import com.nineoldandroids.animation.ValueAnimator;

/**
 * Created by Bernat on 17/12/2014.
 */
public class ViewUtils {

    private int size;

    public ViewUtils(int size) {
        this.size = size;
    }

    public void expand(View summary) {
        summary.setVisibility(View.VISIBLE);

        //set Visible

        final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
        summary.measure(widthSpec, size);

        ValueAnimator valueAnimator = slideAnimator(0, size, summary);
        valueAnimator.start();
    }

    public void collapse(final View summary) {
        int finalHeight = summary.getHeight();

        ValueAnimator mAnimator = slideAnimator(finalHeight, 0, summary);

        mAnimator.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationEnd(Animator animator) {
                //Height=0, but it set visibility to GONE
                summary.setVisibility(View.GONE);
            }

            @Override
            public void onAnimationStart(Animator animator) {
            }

            @Override
            public void onAnimationCancel(Animator animator) {
            }

            @Override
            public void onAnimationRepeat(Animator animator) {
            }
        });
        mAnimator.start();
    }

    private ValueAnimator slideAnimator(int start, int end, final View summary) {

        ValueAnimator heightAnimator = ObjectAnimator.ofInt(start, end);
        heightAnimator.setDuration(200);
        heightAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
        heightAnimator.setEvaluator(new IntEvaluator());

        heightAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                //Update Height
                int value = (Integer) valueAnimator.getAnimatedValue();

                ViewGroup.LayoutParams layoutParams = summary.getLayoutParams();
                layoutParams.height = value;
                summary.setLayoutParams(layoutParams);
            }
        });
        return heightAnimator;
    }

}