diff --git a/quickstep/src/com/android/quickstep/ActivityControlHelper.java b/quickstep/src/com/android/quickstep/ActivityControlHelper.java
index 952b689..4646fd7f 100644
--- a/quickstep/src/com/android/quickstep/ActivityControlHelper.java
+++ b/quickstep/src/com/android/quickstep/ActivityControlHelper.java
@@ -21,6 +21,7 @@
 import static com.android.launcher3.LauncherState.BACKGROUND_APP;
 import static com.android.launcher3.LauncherState.FAST_OVERVIEW;
 import static com.android.launcher3.LauncherState.OVERVIEW;
+import static com.android.launcher3.allapps.AllAppsTransitionController.ALL_APPS_PROGRESS;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
 import static com.android.launcher3.states.RotationHelper.REQUEST_LOCK;
 import static com.android.quickstep.TouchConsumer.INTERACTION_NORMAL;
@@ -52,9 +53,9 @@
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.R;
 import com.android.launcher3.TestProtocol;
+import com.android.launcher3.allapps.AllAppsTransitionController;
 import com.android.launcher3.allapps.DiscoveryBounce;
 import com.android.launcher3.anim.AnimatorPlaybackController;
-import com.android.launcher3.anim.SpringObjectAnimator;
 import com.android.launcher3.compat.AccessibilityManagerCompat;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.dragndrop.DragLayer;
@@ -294,8 +295,8 @@
 
             AnimatorSet anim = new AnimatorSet();
             if (!activity.getDeviceProfile().isVerticalBarLayout()) {
-                Animator shiftAnim = new SpringObjectAnimator(activity.getAllAppsController(),
-                        activity.getAllAppsController().getShiftRange(),
+                AllAppsTransitionController controller = activity.getAllAppsController();
+                ObjectAnimator shiftAnim = ObjectAnimator.ofFloat(controller, ALL_APPS_PROGRESS,
                         fromState.getVerticalProgress(activity),
                         endState.getVerticalProgress(activity));
                 shiftAnim.setInterpolator(LINEAR);
diff --git a/quickstep/src/com/android/quickstep/LongSwipeHelper.java b/quickstep/src/com/android/quickstep/LongSwipeHelper.java
index 80d37ae..16214dd 100644
--- a/quickstep/src/com/android/quickstep/LongSwipeHelper.java
+++ b/quickstep/src/com/android/quickstep/LongSwipeHelper.java
@@ -19,7 +19,6 @@
 import static com.android.launcher3.LauncherState.ALL_APPS;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.anim.Interpolators.DEACCEL;
-import static com.android.launcher3.config.FeatureFlags.QUICKSTEP_SPRINGS;
 import static com.android.quickstep.WindowTransformSwipeHandler.MAX_SWIPE_DURATION;
 import static com.android.quickstep.WindowTransformSwipeHandler.MIN_OVERSHOOT_DURATION;
 
@@ -42,6 +41,7 @@
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 import com.android.launcher3.util.FlingBlockCheck;
 import com.android.quickstep.views.RecentsView;
+import com.android.systemui.shared.system.RemoteAnimationTargetCompat;
 
 /**
  * Utility class to handle long swipe from an app.
@@ -113,7 +113,7 @@
                     * MAX_SWIPE_DURATION * SWIPE_DURATION_MULTIPLIER));
             duration = Math.min(MAX_SWIPE_DURATION, expectedDuration);
 
-            if (blockedFling && !toAllApps && !QUICKSTEP_SPRINGS.get()) {
+            if (blockedFling && !toAllApps) {
                 Interpolators.OvershootParams overshoot = new OvershootParams(currentFraction,
                         currentFraction, endProgress, velocityPxPerMs, (int) mMaxSwipeDistance);
                 duration = (overshoot.duration + duration);
@@ -145,12 +145,7 @@
         ValueAnimator animator = mAnimator.getAnimationPlayer();
         animator.setDuration(duration).setInterpolator(interpolator);
         animator.setFloatValues(currentFraction, endProgress);
-
-        if (QUICKSTEP_SPRINGS.get()) {
-            mAnimator.dispatchOnStartWithVelocity(endProgress, velocityPxPerMs);
-        } else {
-            animator.start();
-        }
+        animator.start();
     }
 
     private void onSwipeAnimationComplete(boolean toAllApps, boolean isFling, Runnable callback) {
diff --git a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
index 7317178..686b52b 100644
--- a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
+++ b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
@@ -22,7 +22,6 @@
 import static com.android.launcher3.anim.Interpolators.DEACCEL;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
 import static com.android.launcher3.anim.Interpolators.OVERSHOOT_1_2;
-import static com.android.launcher3.config.FeatureFlags.QUICKSTEP_SPRINGS;
 import static com.android.quickstep.QuickScrubController.QUICK_SCRUB_FROM_APP_START_DURATION;
 import static com.android.quickstep.QuickScrubController.QUICK_SWITCH_FROM_APP_START_DURATION;
 import static com.android.quickstep.TouchConsumer.INTERACTION_NORMAL;
@@ -789,8 +788,7 @@
             mRecentsAnimationWrapper.enableTouchProxy();
         }
 
-        animateToProgress(startShift, endShift, duration, interpolator, goingToHome,
-                velocityPxPerMs);
+        animateToProgress(startShift, endShift, duration, interpolator, goingToHome);
     }
 
     private void doLogGesture(boolean toLauncher) {
@@ -815,14 +813,14 @@
     }
 
     /** Animates to the given progress, where 0 is the current app and 1 is overview. */
-    private void animateToProgress(float start, float end, long duration, Interpolator interpolator,
-            boolean goingToHome, float velocityPxPerMs) {
+    private void animateToProgress(float start, float end, long duration,
+            Interpolator interpolator, boolean goingToHome) {
         mRecentsAnimationWrapper.runOnInit(() -> animateToProgressInternal(start, end, duration,
-                interpolator, goingToHome, velocityPxPerMs));
+                interpolator, goingToHome));
     }
 
     private void animateToProgressInternal(float start, float end, long duration,
-            Interpolator interpolator, boolean goingToHome, float velocityPxPerMs) {
+            Interpolator interpolator, boolean goingToHome) {
         mIsGoingToHome = goingToHome;
         ObjectAnimator anim = mCurrentShift.animateToValue(start, end).setDuration(duration);
         anim.setInterpolator(interpolator);
@@ -856,12 +854,7 @@
                 mLauncherTransitionController.dispatchSetInterpolator(Interpolators.mapToProgress(
                         interpolator, adjustedStart, end));
                 mLauncherTransitionController.getAnimationPlayer().setDuration(adjustedDuration);
-
-                if (QUICKSTEP_SPRINGS.get()) {
-                    mLauncherTransitionController.dispatchOnStartWithVelocity(end, velocityPxPerMs);
-                } else {
-                    mLauncherTransitionController.getAnimationPlayer().start();
-                }
+                mLauncherTransitionController.getAnimationPlayer().start();
             }
         });
     }
@@ -1006,7 +999,7 @@
         long duration = FeatureFlags.QUICK_SWITCH.get()
                 ? QUICK_SWITCH_FROM_APP_START_DURATION
                 : QUICK_SCRUB_FROM_APP_START_DURATION;
-        animateToProgress(mCurrentShift.value, 1f, duration, LINEAR, true /* goingToHome */, 1f);
+        animateToProgress(mCurrentShift.value, 1f, duration, LINEAR, true /* goingToHome */);
     }
 
     private void onQuickScrubStartUi() {
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index 962c25b..ffbf34c 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -1,6 +1,7 @@
 package com.android.launcher3.allapps;
 
 import static com.android.launcher3.LauncherState.ALL_APPS_CONTENT;
+import static com.android.launcher3.LauncherState.ALL_APPS_HEADER;
 import static com.android.launcher3.LauncherState.ALL_APPS_HEADER_EXTRA;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.LauncherState.VERTICAL_SWIPE_INDICATOR;
@@ -14,7 +15,9 @@
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
+import android.animation.ObjectAnimator;
 import android.util.Property;
+import android.view.View;
 import android.view.animation.Interpolator;
 
 import com.android.launcher3.DeviceProfile;
@@ -26,15 +29,10 @@
 import com.android.launcher3.R;
 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorSetBuilder;
-import com.android.launcher3.anim.SpringObjectAnimator;
 import com.android.launcher3.anim.PropertySetter;
-import com.android.launcher3.anim.SpringObjectAnimator.SpringProperty;
 import com.android.launcher3.util.Themes;
 import com.android.launcher3.views.ScrimView;
 
-import androidx.dynamicanimation.animation.FloatPropertyCompat;
-import androidx.dynamicanimation.animation.SpringAnimation;
-
 /**
  * Handles AllApps view transition.
  * 1) Slides all apps view using direct manipulation
@@ -61,53 +59,6 @@
         }
     };
 
-    public static final FloatPropertyCompat<AllAppsTransitionController> ALL_APPS_PROGRESS_SPRING
-            = new FloatPropertyCompat<AllAppsTransitionController>("allAppsProgressSpring") {
-        @Override
-        public float getValue(AllAppsTransitionController controller) {
-            return controller.mProgress;
-        }
-
-        @Override
-        public void setValue(AllAppsTransitionController controller, float progress) {
-            controller.setProgress(progress);
-        }
-    };
-
-    /**
-     * Property that either sets the progress directly or animates the progress via a spring.
-     */
-    public static class AllAppsSpringProperty extends
-            SpringProperty<AllAppsTransitionController, Float> {
-
-        SpringAnimation mSpring;
-        boolean useSpring = false;
-
-        public AllAppsSpringProperty(SpringAnimation spring) {
-            super(Float.class, "allAppsSpringProperty");
-            mSpring = spring;
-        }
-
-        @Override
-        public Float get(AllAppsTransitionController controller) {
-            return controller.getProgress();
-        }
-
-        @Override
-        public void set(AllAppsTransitionController controller, Float progress) {
-            if (useSpring) {
-                mSpring.animateToFinalPosition(progress);
-            } else {
-                controller.setProgress(progress);
-            }
-        }
-
-        @Override
-        public void switchToSpring() {
-            useSpring = true;
-        }
-    }
-
     private AllAppsContainerView mAppsView;
     private ScrimView mScrimView;
 
@@ -223,8 +174,8 @@
         Interpolator interpolator = config.userControlled ? LINEAR : toState == OVERVIEW
                 ? builder.getInterpolator(ANIM_OVERVIEW_SCALE, FAST_OUT_SLOW_IN)
                 : FAST_OUT_SLOW_IN;
-        Animator anim = new SpringObjectAnimator(this, 1f / mShiftRange, mProgress,
-                targetProgress);
+        ObjectAnimator anim =
+                ObjectAnimator.ofFloat(this, ALL_APPS_PROGRESS, mProgress, targetProgress);
         anim.setDuration(config.duration);
         anim.setInterpolator(builder.getInterpolator(ANIM_VERTICAL_PROGRESS, interpolator));
         anim.addListener(getProgressAnimatorListener());
diff --git a/src/com/android/launcher3/anim/AnimatorPlaybackController.java b/src/com/android/launcher3/anim/AnimatorPlaybackController.java
index 62f59e4..819c843 100644
--- a/src/com/android/launcher3/anim/AnimatorPlaybackController.java
+++ b/src/com/android/launcher3/anim/AnimatorPlaybackController.java
@@ -16,7 +16,6 @@
 package com.android.launcher3.anim;
 
 import static com.android.launcher3.anim.Interpolators.LINEAR;
-import static com.android.launcher3.config.FeatureFlags.QUICKSTEP_SPRINGS;
 
 import android.animation.Animator;
 import android.animation.Animator.AnimatorListener;
@@ -24,16 +23,10 @@
 import android.animation.AnimatorSet;
 import android.animation.TimeInterpolator;
 import android.animation.ValueAnimator;
-import android.util.Log;
 
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-
-import androidx.dynamicanimation.animation.DynamicAnimation;
-import androidx.dynamicanimation.animation.SpringAnimation;
 
 /**
  * Helper class to control the playback of an {@link AnimatorSet}, with custom interpolators
@@ -44,9 +37,6 @@
  */
 public abstract class AnimatorPlaybackController implements ValueAnimator.AnimatorUpdateListener {
 
-    private static final String TAG = "AnimatorPlaybackCtrler";
-    private static boolean DEBUG = false;
-
     public static AnimatorPlaybackController wrap(AnimatorSet anim, long duration) {
         return wrap(anim, duration, null);
     }
@@ -70,7 +60,6 @@
     private final long mDuration;
 
     protected final AnimatorSet mAnim;
-    private Set<SpringAnimation> mSprings;
 
     protected float mCurrentFraction;
     private Runnable mEndAction;
@@ -78,9 +67,6 @@
     protected boolean mTargetCancelled = false;
     protected Runnable mOnCancelRunnable;
 
-    private OnAnimationEndDispatcher mEndListener;
-    private DynamicAnimation.OnAnimationEndListener mSpringEndListener;
-
     protected AnimatorPlaybackController(AnimatorSet anim, long duration,
             Runnable onCancelRunnable) {
         mAnim = anim;
@@ -89,8 +75,7 @@
 
         mAnimationPlayer = ValueAnimator.ofFloat(0, 1);
         mAnimationPlayer.setInterpolator(LINEAR);
-        mEndListener = new OnAnimationEndDispatcher();
-        mAnimationPlayer.addListener(mEndListener);
+        mAnimationPlayer.addListener(new OnAnimationEndDispatcher());
         mAnimationPlayer.addUpdateListener(this);
 
         mAnim.addListener(new AnimatorListenerAdapter() {
@@ -114,15 +99,6 @@
                 mTargetCancelled = false;
             }
         });
-
-        mSprings = new HashSet<>();
-        mSpringEndListener = (animation, canceled, value, velocity1) -> {
-            if (canceled) {
-                mEndListener.onAnimationCancel(mAnimationPlayer);
-            } else {
-                mEndListener.onAnimationEnd(mAnimationPlayer);
-            }
-        };
     }
 
     public AnimatorSet getTarget() {
@@ -204,29 +180,6 @@
         }
     }
 
-    /**
-     * Starts playback and sets the spring.
-     */
-    public void dispatchOnStartWithVelocity(float end, float velocity) {
-        if (!QUICKSTEP_SPRINGS.get()) {
-            dispatchOnStart();
-            return;
-        }
-
-        if (DEBUG) Log.d(TAG, "dispatchOnStartWithVelocity#end=" + end + ", velocity=" + velocity);
-
-        for (Animator a : mAnim.getChildAnimations()) {
-            if (a instanceof SpringObjectAnimator) {
-                if (DEBUG) Log.d(TAG, "Found springAnimator=" + a);
-                SpringObjectAnimator springAnimator = (SpringObjectAnimator) a;
-                mSprings.add(springAnimator.getSpring());
-                springAnimator.startSpring(end, velocity, mSpringEndListener);
-            }
-        }
-
-        dispatchOnStart();
-    }
-
     public void dispatchOnStart() {
         dispatchOnStartRecursively(mAnim);
     }
@@ -329,18 +282,6 @@
         }
     }
 
-    private boolean isAnySpringRunning() {
-        for (SpringAnimation spring : mSprings) {
-            if (spring.isRunning()) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Only dispatches the on end actions once the animator and all springs have completed running.
-     */
     private class OnAnimationEndDispatcher extends AnimationSuccessListener {
 
         @Override
@@ -350,12 +291,9 @@
 
         @Override
         public void onAnimationSuccess(Animator animator) {
-            // We wait for the spring (if any) to finish running before completing the end callback.
-            if (mSprings.isEmpty() || !isAnySpringRunning()) {
-                dispatchOnEndRecursively(mAnim);
-                if (mEndAction != null) {
-                    mEndAction.run();
-                }
+            dispatchOnEndRecursively(mAnim);
+            if (mEndAction != null) {
+                mEndAction.run();
             }
         }
 
diff --git a/src/com/android/launcher3/anim/SpringObjectAnimator.java b/src/com/android/launcher3/anim/SpringObjectAnimator.java
deleted file mode 100644
index 1e36570..0000000
--- a/src/com/android/launcher3/anim/SpringObjectAnimator.java
+++ /dev/null
@@ -1,270 +0,0 @@
-/*
- * Copyright (C) 2019 The Android Open Source Project
- *
- * 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.
- */
-package com.android.launcher3.anim;
-
-import android.animation.Animator;
-import android.animation.AnimatorListenerAdapter;
-import android.animation.ObjectAnimator;
-import android.animation.TimeInterpolator;
-import android.animation.ValueAnimator;
-import android.util.Log;
-import android.util.Property;
-
-import com.android.launcher3.allapps.AllAppsTransitionController;
-import com.android.launcher3.allapps.AllAppsTransitionController.AllAppsSpringProperty;
-
-import java.util.ArrayList;
-
-import androidx.dynamicanimation.animation.DynamicAnimation.OnAnimationEndListener;
-import androidx.dynamicanimation.animation.SpringAnimation;
-import androidx.dynamicanimation.animation.SpringForce;
-
-/**
- * This animator allows for an object's property to be be controlled by an {@link ObjectAnimator} or
- * a {@link SpringAnimation}. It extends ValueAnimator so it can be used in an AnimatorSet.
- */
-public class SpringObjectAnimator extends ValueAnimator {
-
-    private static final String TAG = "SpringObjectAnimator";
-    private static boolean DEBUG = false;
-
-    private AllAppsTransitionController mObject;
-    private ObjectAnimator mObjectAnimator;
-    private float[] mValues;
-
-    private SpringAnimation mSpring;
-    private AllAppsSpringProperty mProperty;
-
-    private ArrayList<AnimatorListener> mListeners;
-    private boolean mSpringEnded = false;
-    private boolean mAnimatorEnded = false;
-    private boolean mEnded = false;
-
-    private static final float SPRING_DAMPING_RATIO = 0.9f;
-    private static final float SPRING_STIFFNESS = 600f;
-
-    public SpringObjectAnimator(AllAppsTransitionController object, float minimumVisibleChange,
-            float... values) {
-        mObject = object;
-        mSpring = new SpringAnimation(object, AllAppsTransitionController.ALL_APPS_PROGRESS_SPRING);
-        mSpring.setMinimumVisibleChange(minimumVisibleChange);
-        mSpring.setSpring(new SpringForce(0)
-                .setDampingRatio(SPRING_DAMPING_RATIO)
-                .setStiffness(SPRING_STIFFNESS));
-        mSpring.setStartVelocity(0.01f);
-        mProperty = new AllAppsSpringProperty(mSpring);
-        mObjectAnimator = ObjectAnimator.ofFloat(object, mProperty, values);
-        mValues = values;
-        mListeners = new ArrayList<>();
-        setFloatValues(values);
-
-        mObjectAnimator.addListener(new AnimatorListenerAdapter() {
-            @Override
-            public void onAnimationStart(Animator animation) {
-                mAnimatorEnded = false;
-                mEnded = false;
-                for (AnimatorListener l : mListeners) {
-                    l.onAnimationStart(animation);
-                }
-            }
-
-            @Override
-            public void onAnimationEnd(Animator animation) {
-                mAnimatorEnded = true;
-                tryEnding();
-            }
-
-            @Override
-            public void onAnimationCancel(Animator animation) {
-                for (AnimatorListener l : mListeners) {
-                    l.onAnimationCancel(animation);
-                }
-                mSpring.animateToFinalPosition(mObject.getProgress());
-            }
-        });
-
-        mSpring.addUpdateListener((animation, value, velocity) -> mSpringEnded = false);
-        mSpring.addEndListener((animation, canceled, value, velocity) -> {
-            mSpringEnded = true;
-            tryEnding();
-        });
-    }
-
-    private void tryEnding() {
-        if (DEBUG) {
-            Log.d(TAG, "tryEnding#mAnimatorEnded=" + mAnimatorEnded + ", mSpringEnded="
-                    + mSpringEnded + ", mEnded=" + mEnded);
-        }
-
-        if (mAnimatorEnded && mSpringEnded && !mEnded) {
-            for (AnimatorListener l : mListeners) {
-                l.onAnimationEnd(mObjectAnimator);
-            }
-            mEnded = true;
-        }
-    }
-
-    public SpringAnimation getSpring() {
-        return mSpring;
-    }
-
-    /**
-     * Initializes and sets up the spring to take over controlling the object.
-     */
-    void startSpring(float end, float velocity, OnAnimationEndListener endListener) {
-        // Cancel the spring so we can set new start velocity and final position. We need to remove
-        // the listener since the spring is not actually ending.
-        mSpring.removeEndListener(endListener);
-        mSpring.cancel();
-        mSpring.addEndListener(endListener);
-
-        mProperty.switchToSpring();
-
-        mSpring.setStartVelocity(velocity);
-        mSpring.animateToFinalPosition(end == 0 ? mValues[0] : mValues[1]);
-    }
-
-    @Override
-    public void addListener(AnimatorListener listener) {
-        mListeners.add(listener);
-    }
-
-    @Override
-    public void addPauseListener(AnimatorPauseListener listener) {
-        mObjectAnimator.addPauseListener(listener);
-    }
-
-    @Override
-    public void cancel() {
-        mSpring.animateToFinalPosition(mObject.getProgress());
-        mObjectAnimator.cancel();
-    }
-
-    @Override
-    public void end() {
-        mObjectAnimator.end();
-    }
-
-    @Override
-    public long getDuration() {
-        return mObjectAnimator.getDuration();
-    }
-
-    @Override
-    public TimeInterpolator getInterpolator() {
-        return mObjectAnimator.getInterpolator();
-    }
-
-    @Override
-    public ArrayList<AnimatorListener> getListeners() {
-        return mObjectAnimator.getListeners();
-    }
-
-    @Override
-    public long getStartDelay() {
-        return mObjectAnimator.getStartDelay();
-    }
-
-    @Override
-    public long getTotalDuration() {
-        return mObjectAnimator.getTotalDuration();
-    }
-
-    @Override
-    public boolean isPaused() {
-        return mObjectAnimator.isPaused();
-    }
-
-    @Override
-    public boolean isRunning() {
-        return mObjectAnimator.isRunning();
-    }
-
-    @Override
-    public boolean isStarted() {
-        return mObjectAnimator.isStarted();
-    }
-
-    @Override
-    public void pause() {
-        mObjectAnimator.pause();
-    }
-
-    @Override
-    public void removeAllListeners() {
-        mObjectAnimator.removeAllListeners();
-    }
-
-    @Override
-    public void removeListener(AnimatorListener listener) {
-        mObjectAnimator.removeListener(listener);
-    }
-
-    @Override
-    public void removePauseListener(AnimatorPauseListener listener) {
-        mObjectAnimator.removePauseListener(listener);
-    }
-
-    @Override
-    public void resume() {
-        mObjectAnimator.resume();
-    }
-
-    @Override
-    public ValueAnimator setDuration(long duration) {
-        return mObjectAnimator.setDuration(duration);
-    }
-
-    @Override
-    public void setInterpolator(TimeInterpolator value) {
-        mObjectAnimator.setInterpolator(value);
-    }
-
-    @Override
-    public void setStartDelay(long startDelay) {
-        mObjectAnimator.setStartDelay(startDelay);
-    }
-
-    @Override
-    public void setTarget(Object target) {
-        mObjectAnimator.setTarget(target);
-    }
-
-    @Override
-    public void start() {
-        mObjectAnimator.start();
-    }
-
-    @Override
-    public void setCurrentFraction(float fraction) {
-        mObjectAnimator.setCurrentFraction(fraction);
-    }
-
-    @Override
-    public void setCurrentPlayTime(long playTime) {
-        mObjectAnimator.setCurrentPlayTime(playTime);
-    }
-
-    public static abstract class SpringProperty<T, V> extends Property<T, V> {
-
-        public SpringProperty(Class<V> type, String name) {
-            super(type, name);
-        }
-
-        abstract public void switchToSpring();
-    }
-
-}
diff --git a/src/com/android/launcher3/config/BaseFlags.java b/src/com/android/launcher3/config/BaseFlags.java
index 3a7c949..b01e41e 100644
--- a/src/com/android/launcher3/config/BaseFlags.java
+++ b/src/com/android/launcher3/config/BaseFlags.java
@@ -98,9 +98,6 @@
     public static final TogglableFlag ENABLE_TASK_STABILIZER = new TogglableFlag(
             "ENABLE_TASK_STABILIZER", false, "Stable task list across fast task switches");
 
-    public static final TogglableFlag QUICKSTEP_SPRINGS = new TogglableFlag("QUICKSTEP_SPRINGS",
-            false, "Enable springs for quickstep animations");
-
     public static void initialize(Context context) {
         // Avoid the disk read for user builds
         if (Utilities.IS_DEBUG_DEVICE) {
diff --git a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
index bb14328..a7bd243 100644
--- a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
+++ b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
@@ -24,7 +24,6 @@
 import static com.android.launcher3.LauncherStateManager.NON_ATOMIC_COMPONENT;
 import static com.android.launcher3.Utilities.SINGLE_FRAME_MS;
 import static com.android.launcher3.anim.Interpolators.scrollInterpolatorForVelocity;
-import static com.android.launcher3.config.FeatureFlags.QUICKSTEP_SPRINGS;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
@@ -46,7 +45,6 @@
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.compat.AccessibilityManagerCompat;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.userevent.nano.LauncherLogProto;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Direction;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch;
@@ -430,8 +428,8 @@
         maybeUpdateAtomicAnim(mFromState, targetState, targetState == mToState ? 1f : 0f);
         updateSwipeCompleteAnimation(anim, Math.max(duration, getRemainingAtomicDuration()),
                 targetState, velocity, fling);
-        mCurrentAnimation.dispatchOnStartWithVelocity(endProgress, velocity);
-        if (fling && targetState == LauncherState.ALL_APPS && !QUICKSTEP_SPRINGS.get()) {
+        mCurrentAnimation.dispatchOnStart();
+        if (fling && targetState == LauncherState.ALL_APPS) {
             mLauncher.getAppsView().addSpringFromFlingUpdateListener(anim, velocity);
         }
         anim.start();