Update animation helper class to most recent version

import android.animation.Animator;

import android.animation.AnimatorListenerAdapter;

import android.animation.ValueAnimator;

import android.animation.Animator.AnimatorListener;

import android.util.Log;

import android.view.ViewTreeObserver;

import android.view.View;

import android.view.ViewPropertyAnimator;

import android.view.ViewTreeObserver;

/*

 *  This is a helper class that listens to updates from the corresponding animation.

 *  For the first two frames, it adjusts the current play time of the animation to

 *  prevent jank at the beginning of the animation

 */

public class FirstFrameAnimatorHelper implements ValueAnimator.AnimatorUpdateListener {

public class FirstFrameAnimatorHelper extends AnimatorListenerAdapter

    implements ValueAnimator.AnimatorUpdateListener {

    private static final boolean DEBUG = false;

    private static final int MAX_DELAY = 1000;

    private static final int IDEAL_FRAME_DURATION = 16;

    public FirstFrameAnimatorHelper(ViewPropertyAnimator vpa, View target) {

        mTarget = target;

        vpa.setListener(new AnimatorListenerAdapter() {

        vpa.setListener(this);

    }

    // only used for ViewPropertyAnimators

    public void onAnimationStart(Animator animation) {

        final ValueAnimator va = (ValueAnimator) animation;

        va.addUpdateListener(FirstFrameAnimatorHelper.this);

        onAnimationUpdate(va);

    }

            });

    }

    public static void initializeDrawListener(View view) {

        if (sGlobalDrawListener != null) {

            mStartTime = currentTime;

        }

        if (!mHandlingOnAnimationUpdate) {

        if (!mHandlingOnAnimationUpdate &&

            // If the current play time exceeds the duration, the animation

            // will get finished, even if we call setCurrentPlayTime -- therefore

            // don't adjust the animation in that case

            animation.getCurrentPlayTime() < animation.getDuration()) {

            mHandlingOnAnimationUpdate = true;

            long frameNum = sGlobalFrameCounter - mStartFrame;

            // If we haven't drawn our first frame, reset the time to t = 0