Agressively change the color of the the all apps background during pull up

import android.animation.AnimatorSet;

import android.animation.ArgbEvaluator;

import android.animation.ObjectAnimator;

import android.graphics.Color;

import android.support.v4.content.ContextCompat;

import android.support.v4.graphics.ColorUtils;

import android.support.v4.view.animation.FastOutSlowInInterpolator;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

import android.view.animation.AccelerateInterpolator;

import android.view.animation.DecelerateInterpolator;

import android.view.animation.Interpolator;

import com.android.launcher3.DeviceProfile;

    private static final boolean DBG = false;

    private final Interpolator mAccelInterpolator = new AccelerateInterpolator(2f);

    private final Interpolator mDecelInterpolator = new DecelerateInterpolator(3f);

    private final Interpolator mFastOutSlowInInterpolator = new FastOutSlowInInterpolator();

    private final ScrollInterpolator mScrollInterpolator = new ScrollInterpolator();

        float workspaceHotseatAlpha = Utilities.boundToRange(progress, 0f, 1f);

        float alpha = 1 - workspaceHotseatAlpha;

        float interpolation = mAccelInterpolator.getInterpolation(workspaceHotseatAlpha);

        int color = (Integer) mEvaluator.evaluate(alpha,

        int color = (Integer) mEvaluator.evaluate(mDecelInterpolator.getInterpolation(alpha),

                mHotseatBackgroundColor, mAllAppsBackgroundColor);

        mAppsView.setRevealDrawableColor(color);

        int bgAlpha = Color.alpha((int) mEvaluator.evaluate(alpha,

                mHotseatBackgroundColor, mAllAppsBackgroundColor));

        mAppsView.setRevealDrawableColor(ColorUtils.setAlphaComponent(color, bgAlpha));

        mAppsView.getContentView().setAlpha(alpha);

        mAppsView.setTranslationY(shiftCurrent);