ListView Animation bug

AnimationTestActivity.java

package net.whatsbeef.animationtest;

import android.animation.Animator;
import android.animation.Animator.AnimatorListener;
import android.animation.AnimatorInflater;
import android.animation.AnimatorSet;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class AnimationTestActivity extends Activity {
	private ListView indexList;

	private String[] items = {
			"Caused",
			"By:",
			"java.lang.NullPointerException",
			"at",
			"wat"
	};
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		indexList = (ListView)findViewById(R.id.index_list);
		indexList.setAdapter(new ArrayAdapter<String>(this, android.R.layout. simple_list_item_activated_1, items));		
	}

	public void onAnimateClick(View v)
	{
		AnimatorSet anim;
		if (indexList.getVisibility() == View.GONE) {
			indexList.setVisibility(View.VISIBLE);
			anim = (AnimatorSet) AnimatorInflater.loadAnimator(this,
					R.anim.push_left_in);
			anim.setTarget(indexList);
			anim.start();
		} else {
			//indexList.setVisibility(View.VISIBLE);
			anim = (AnimatorSet) AnimatorInflater.loadAnimator(this,
					R.anim.push_left_out);
			anim.setTarget(indexList);
			anim.addListener(new AnimatorListener() {
				@Override
				public void onAnimationCancel(Animator animation) {
					// TODO Auto-generated method stub

				}

				@Override
				public void onAnimationEnd(Animator animation) {
					indexList.setVisibility(View.GONE);
				}

				@Override
				public void onAnimationRepeat(Animator animation) {					
				}

				@Override
				public void onAnimationStart(Animator animation) {					
				}
			});
			anim.start();
		}
	}
}

main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/animation_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <VideoView
        android:id="@+id/imageView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true"
        android:src="@drawable/ic_launcher" />
    
    <ListView
        android:id="@+id/index_list"
        android:layout_width="200dp"
        android:layout_height="match_parent"
        android:background="#aaffffff"
        android:visibility="gone" >
    </ListView>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:onClick="onAnimateClick"
        android:text="Button" />

</RelativeLayout>

push_left_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <objectAnimator
        android:duration="300"
        android:propertyName="x"
        android:repeatCount="0"
        android:startOffset="0"
        android:valueFrom="-100"
        android:valueTo="0"
        android:valueType="floatType" />
    <objectAnimator
        android:duration="300"
        android:propertyName="rotationY"
        android:repeatCount="0"
        android:startOffset="0"
        android:valueFrom="90"
        android:valueTo="0"
        android:valueType="floatType" />
    <objectAnimator
        android:duration="300"
        android:propertyName="alpha"
        android:repeatCount="0"
        android:startOffset="0"
        android:valueFrom="0"
        android:valueTo="1"
        android:valueType="floatType" />

</set>

push_left_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <objectAnimator
        android:duration="300"
        android:propertyName="x"
        android:repeatCount="0"
        android:startOffset="0"
        android:valueFrom="0"
        android:valueTo="-100"
        android:valueType="floatType" />
    <objectAnimator
        android:duration="300"
        android:propertyName="rotationY"
        android:repeatCount="0"
        android:startOffset="0"
        android:valueFrom="0"
        android:valueTo="90"
        android:valueType="floatType" />
    <objectAnimator
        android:duration="300"
        android:propertyName="alpha"
        android:repeatCount="0"
        android:startOffset="0"
        android:valueFrom="1"
        android:valueTo="0"
        android:valueType="floatType" />

</set>