diff --git a/sample/src/se/emilsjolander/stickylistheaders/sample/ExpandableListTestActivity.java b/sample/src/se/emilsjolander/stickylistheaders/sample/ExpandableListTestActivity.java
new file mode 100644
index 00000000..0a9f8c4e
--- /dev/null
+++ b/sample/src/se/emilsjolander/stickylistheaders/sample/ExpandableListTestActivity.java
@@ -0,0 +1,50 @@
+package se.emilsjolander.stickylistheaders.sample;
+
+/**
+ * Created by panwenye on 14-6-14.
+ */
+public class ExpandableListTestActivity {
+    //        final ViewGroup.LayoutParams lp = target.getLayoutParams();
+//
+//        float animStartY = type == ANIMATION_EXPAND ? 0f : viewHeight;
+//        float animEndY = type == ANIMATION_EXPAND ? viewHeight : 0f;
+//        ValueAnimator animator = ValueAnimator.ofFloat(animStartY, animEndY);
+//        animator.setDuration(200);
+//        animator.addListener(new Animator.AnimatorListener() {
+//            @Override
+//            public void onAnimationStart(Animator animator) {
+//                if (type == ExpandCollapseAnimation.EXPAND) {
+//                    target.setVisibility(View.VISIBLE);
+//                }
+//            }
+//
+//            @Override
+//            public void onAnimationEnd(Animator animator) {
+//                if (type == ExpandCollapseAnimation.EXPAND) {
+//                    target.setVisibility(View.VISIBLE);
+//                } else {
+//                    target.setVisibility(View.GONE);
+//                }
+//                target.getLayoutParams().height = viewHeight;
+//            }
+//
+//            @Override
+//            public void onAnimationCancel(Animator animator) {
+//
+//            }
+//
+//            @Override
+//            public void onAnimationRepeat(Animator animator) {
+//
+//            }
+//        });
+//        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
+//            @Override
+//            public void onAnimationUpdate(ValueAnimator valueAnimator) {
+//                lp.height = ((Float) valueAnimator.getAnimatedValue()).intValue();
+//                target.setLayoutParams(lp);
+//                target.requestLayout();
+//            }
+//        });
+//        animator.start();
+}