Google+ Listview Animation

GooglePlusAdapter.java

import android.animation.Animator;
import android.animation.AnimatorInflater;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.ArrayAdapter;
import it.tgs.wow.light.R;

/**
 * Created with IntelliJ IDEA.
 * User: SimoneBellotti
 * Date: 09/01/2015
 * Time: 12.11
 */
public class GooglePlusAdapter
        extends ArrayAdapter<Object> {

    public GooglePlusAdapter(Context context, Object[] objects) {
        super(context, android.R.layout.simple_list_item_1, objects);
    }

    private int lastPosition = -1;

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        //Doing inflating and user ViewHolder pattern

        //After inflating animate the item
        if (position > lastPosition) {
            convertView.startAnimation(AnimationUtils.loadAnimation(getContext(), R.anim.slide_up));
            Animator animator = AnimatorInflater.loadAnimator(getContext(), R.animator.rotate_animation);
            animator.setTarget(convertView);
            animator.start();
            lastPosition = position;
        }

        return convertView;
    }
}

rotate_animation.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2013 Ahmed Nammari -->

<!-- Licensed under the Apache License, Version 2.0 (the "License"); -->
<!-- you may not use this file except in compliance with the License. -->
<!-- You may obtain a copy of the License at -->

<!-- http://www.apache.org/licenses/LICENSE-2.0 -->

<!-- Unless required by applicable law or agreed to in writing, software -->
<!-- distributed under the License is distributed on an "AS IS" BASIS, -->
<!-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -->
<!-- See the License for the specific language governing permissions and -->
<!-- limitations under the License. -->
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="800"
    android:interpolator="@android:anim/decelerate_interpolator"
    android:propertyName="rotationX"
    android:repeatCount="0"
    android:valueFrom="45"
    android:valueTo="0"
    android:valueType="floatType" />

slide_up.xml

<set xmlns:android="http://schemas.android.com/apk/res/android"
 >

    <translate
        android:duration="600"
        android:fromYDelta="30%p"
        android:toYDelta="0" />

    <alpha
        android:duration="600"
        android:fromAlpha="0.0"
        android:toAlpha="1.0" />


</set>