Use spring to update window/icon scale for swipe up animation.

package com.android.quickstep.util;

import android.animation.Animator;

import android.animation.ObjectAnimator;

import android.animation.PropertyValuesHolder;

import android.animation.ValueAnimator;

import android.content.res.Resources;

import android.graphics.PointF;

import android.graphics.RectF;

import android.util.FloatProperty;

import androidx.dynamicanimation.animation.DynamicAnimation.OnAnimationEndListener;

import androidx.dynamicanimation.animation.FloatPropertyCompat;

import androidx.dynamicanimation.animation.SpringAnimation;

import androidx.dynamicanimation.animation.SpringForce;

import com.android.launcher3.R;

import com.android.launcher3.Utilities;

import com.android.launcher3.anim.AnimationSuccessListener;

import com.android.launcher3.anim.FlingSpringAnim;

import java.util.ArrayList;

import java.util.List;

import static com.android.launcher3.anim.Interpolators.DEACCEL;

/**

 * Applies spring forces to animate from a starting rect to a target rect,

 */

public class RectFSpringAnim {

    /**

     * Although the rect position animation takes an indefinite amount of time since it depends on

     * the initial velocity and applied forces, scaling from the starting rect to the target rect

     * can be done in parallel at a fixed duration. Update callbacks are sent based on the progress

     * of this animation, while the end callback is sent after all animations finish.

     */

    private static final long RECT_SCALE_DURATION = 250;

    private static final FloatPropertyCompat<RectFSpringAnim> RECT_CENTER_X =

            new FloatPropertyCompat<RectFSpringAnim>("rectCenterXSpring") {

                @Override

                }

            };

    private static final FloatProperty<RectFSpringAnim> RECT_SCALE_PROGRESS =

            new FloatProperty<RectFSpringAnim>("rectScaleProgress") {

    private static final FloatPropertyCompat<RectFSpringAnim> RECT_SCALE_PROGRESS =

            new FloatPropertyCompat<RectFSpringAnim>("rectScaleProgress") {

                @Override

                public Float get(RectFSpringAnim anim) {

                    return anim.mCurrentScaleProgress;

                public float getValue(RectFSpringAnim object) {

                    return object.mCurrentScaleProgress;

                }

                @Override

                public void setValue(RectFSpringAnim anim, float currentScaleProgress) {

                    anim.mCurrentScaleProgress = currentScaleProgress;

                    anim.onUpdate();

                public void setValue(RectFSpringAnim object, float value) {

                    object.mCurrentScaleProgress = value;

                    object.onUpdate();

                }

            };

    private float mCurrentScaleProgress;

    private FlingSpringAnim mRectXAnim;

    private FlingSpringAnim mRectYAnim;

    private ValueAnimator mRectScaleAnim;

    private SpringAnimation mRectScaleAnim;

    private boolean mAnimsStarted;

    private boolean mRectXAnimEnded;

    private boolean mRectYAnimEnded;

        mRectYAnim = new FlingSpringAnim(this, RECT_Y, startY, endY, startVelocityY,

                mMinVisChange, minYValue, maxYValue, springVelocityFactor, onYEndListener);

        mRectScaleAnim = ObjectAnimator.ofPropertyValuesHolder(this,

                PropertyValuesHolder.ofFloat(RECT_SCALE_PROGRESS, 1))

                .setDuration(RECT_SCALE_DURATION);

        mRectScaleAnim.setInterpolator(DEACCEL);

        mRectScaleAnim.addListener(new AnimationSuccessListener() {

            @Override

            public void onAnimationSuccess(Animator animator) {

        float minVisibleChange = 1f / mStartRect.height();

        mRectScaleAnim = new SpringAnimation(this, RECT_SCALE_PROGRESS)

                .setSpring(new SpringForce(1f)

                .setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY)

                .setStiffness(SpringForce.STIFFNESS_LOW))

                .setStartVelocity(velocityPxPerMs.y * minVisibleChange)

                .setMaxValue(1f)

                .setMinimumVisibleChange(minVisibleChange)

                .addEndListener((animation, canceled, value, velocity) -> {

                    mRectScaleAnimEnded = true;

                    maybeOnEnd();

            }

                });

        mRectXAnim.start();

        if (mAnimsStarted) {

            mRectXAnim.end();

            mRectYAnim.end();

            mRectScaleAnim.end();

            if (mRectScaleAnim.canSkipToEnd()) {

                mRectScaleAnim.skipToEnd();

            }

        }

    }