diff --git a/Android.mk b/Android.mk
index cccf4e4..0477dab 100644
--- a/Android.mk
+++ b/Android.mk
@@ -182,7 +182,9 @@
 endif
 LOCAL_MODULE := Launcher3QuickStepLib
 LOCAL_PRIVILEGED_MODULE := true
-LOCAL_STATIC_ANDROID_LIBRARIES := Launcher3CommonDepsLib
+LOCAL_STATIC_ANDROID_LIBRARIES := \
+    Launcher3CommonDepsLib \
+    SecondaryDisplayLauncherLib
 
 LOCAL_SRC_FILES := \
     $(call all-java-files-under, src) \
diff --git a/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java b/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java
index 882af59..af1b353 100644
--- a/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java
+++ b/iconloaderlib/src/com/android/launcher3/icons/BaseIconFactory.java
@@ -253,19 +253,24 @@
         badge.draw(target);
     }
 
+    private Bitmap createIconBitmap(Drawable icon, float scale) {
+        return createIconBitmap(icon, scale, mIconBitmapSize);
+    }
+
     /**
+     * @param icon drawable that should be flattened to a bitmap
      * @param scale the scale to apply before drawing {@param icon} on the canvas
      */
-    private Bitmap createIconBitmap(Drawable icon, float scale) {
-        Bitmap bitmap = Bitmap.createBitmap(mIconBitmapSize, mIconBitmapSize,
-                Bitmap.Config.ARGB_8888);
+    public Bitmap createIconBitmap(Drawable icon, float scale, int size) {
+        Bitmap bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
+
         mCanvas.setBitmap(bitmap);
         mOldBounds.set(icon.getBounds());
 
         if (ATLEAST_OREO && icon instanceof AdaptiveIconDrawable) {
-            int offset = Math.max((int) Math.ceil(BLUR_FACTOR * mIconBitmapSize),
-                    Math.round(mIconBitmapSize * (1 - scale) / 2 ));
-            icon.setBounds(offset, offset, mIconBitmapSize - offset, mIconBitmapSize - offset);
+            int offset = Math.max((int) Math.ceil(BLUR_FACTOR * size),
+                    Math.round(size * (1 - scale) / 2 ));
+            icon.setBounds(offset, offset, size - offset, size - offset);
             icon.draw(mCanvas);
         } else {
             if (icon instanceof BitmapDrawable) {
@@ -275,8 +280,8 @@
                     bitmapDrawable.setTargetDensity(mContext.getResources().getDisplayMetrics());
                 }
             }
-            int width = mIconBitmapSize;
-            int height = mIconBitmapSize;
+            int width = size;
+            int height = size;
 
             int intrinsicWidth = icon.getIntrinsicWidth();
             int intrinsicHeight = icon.getIntrinsicHeight();
@@ -289,11 +294,11 @@
                     width = (int) (height * ratio);
                 }
             }
-            final int left = (mIconBitmapSize - width) / 2;
-            final int top = (mIconBitmapSize - height) / 2;
+            final int left = (size - width) / 2;
+            final int top = (size - height) / 2;
             icon.setBounds(left, top, left + width, top + height);
             mCanvas.save();
-            mCanvas.scale(scale, scale, mIconBitmapSize / 2, mIconBitmapSize / 2);
+            mCanvas.scale(scale, scale, size / 2, size / 2);
             icon.draw(mCanvas);
             mCanvas.restore();
 
diff --git a/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java b/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java
index 753f73a..bef3e54 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java
@@ -49,7 +49,7 @@
     private static final String TAG = "OverviewSwipeController";
 
     // Progress after which the transition is assumed to be a success in case user does not fling
-    private static final float SUCCESS_TRANSITION_PROGRESS = 0.5f;
+    public static final float SUCCESS_TRANSITION_PROGRESS = 0.5f;
 
     protected final T mActivity;
     private final SwipeDetector mDetector;
diff --git a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
index 4e79fed..0ef67c4 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
@@ -44,6 +44,8 @@
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.util.TouchController;
+import com.android.launcher3.util.UiThreadHelper;
+import com.android.launcher3.util.UiThreadHelper.AsyncCommand;
 import com.android.quickstep.OverviewInteractionState;
 import com.android.quickstep.RecentsModel;
 import com.android.quickstep.util.RemoteFadeOutAnimationListener;
@@ -58,6 +60,9 @@
 
 public class UiFactory {
 
+    private static final AsyncCommand SET_SHELF_HEIGHT_CMD = (visible, height) ->
+            WindowManagerWrapper.getInstance().setShelfHeight(visible != 0, height);
+
     public static TouchController[] createTouchControllers(Launcher launcher) {
         boolean swipeUpEnabled = OverviewInteractionState.INSTANCE.get(launcher)
                 .isSwipeUpGestureEnabled();
@@ -175,10 +180,10 @@
         LauncherState state = launcher.getStateManager().getState();
         if (!OverviewInteractionState.INSTANCE.get(launcher).swipeGestureInitializing()) {
             DeviceProfile profile = launcher.getDeviceProfile();
-            WindowManagerWrapper.getInstance().setShelfHeight(
-                    (state == NORMAL || state == OVERVIEW) && launcher.isUserActive()
-                            && !profile.isVerticalBarLayout(),
-                    profile.hotseatBarSizePx);
+            boolean visible = (state == NORMAL || state == OVERVIEW) && launcher.isUserActive()
+                    && !profile.isVerticalBarLayout();
+            UiThreadHelper.runAsyncCommand(launcher, SET_SHELF_HEIGHT_CMD,
+                    visible ? 1 : 0, profile.hotseatBarSizePx);
         }
 
         if (state == NORMAL) {
diff --git a/quickstep/src/com/android/quickstep/ActivityControlHelper.java b/quickstep/src/com/android/quickstep/ActivityControlHelper.java
index 4646fd7f..861277f 100644
--- a/quickstep/src/com/android/quickstep/ActivityControlHelper.java
+++ b/quickstep/src/com/android/quickstep/ActivityControlHelper.java
@@ -21,7 +21,6 @@
 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;
@@ -44,6 +43,8 @@
 import android.os.Handler;
 import android.os.Looper;
 import android.view.View;
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
 
 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.DeviceProfile;
@@ -53,9 +54,9 @@
 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;
@@ -77,9 +78,6 @@
 import java.util.function.BiPredicate;
 import java.util.function.Consumer;
 
-import androidx.annotation.Nullable;
-import androidx.annotation.UiThread;
-
 /**
  * Utility class which abstracts out the logical differences between Launcher and RecentsActivity.
  */
@@ -295,8 +293,8 @@
 
             AnimatorSet anim = new AnimatorSet();
             if (!activity.getDeviceProfile().isVerticalBarLayout()) {
-                AllAppsTransitionController controller = activity.getAllAppsController();
-                ObjectAnimator shiftAnim = ObjectAnimator.ofFloat(controller, ALL_APPS_PROGRESS,
+                Animator shiftAnim = new SpringObjectAnimator(activity.getAllAppsController(),
+                        activity.getAllAppsController().getShiftRange(),
                         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 16214dd..80d37ae 100644
--- a/quickstep/src/com/android/quickstep/LongSwipeHelper.java
+++ b/quickstep/src/com/android/quickstep/LongSwipeHelper.java
@@ -19,6 +19,7 @@
 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;
 
@@ -41,7 +42,6 @@
 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) {
+            if (blockedFling && !toAllApps && !QUICKSTEP_SPRINGS.get()) {
                 Interpolators.OvershootParams overshoot = new OvershootParams(currentFraction,
                         currentFraction, endProgress, velocityPxPerMs, (int) mMaxSwipeDistance);
                 duration = (overshoot.duration + duration);
@@ -145,7 +145,12 @@
         ValueAnimator animator = mAnimator.getAnimationPlayer();
         animator.setDuration(duration).setInterpolator(interpolator);
         animator.setFloatValues(currentFraction, endProgress);
-        animator.start();
+
+        if (QUICKSTEP_SPRINGS.get()) {
+            mAnimator.dispatchOnStartWithVelocity(endProgress, velocityPxPerMs);
+        } else {
+            animator.start();
+        }
     }
 
     private void onSwipeAnimationComplete(boolean toAllApps, boolean isFling, Runnable callback) {
diff --git a/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java b/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java
index 95be188..e27af2a 100644
--- a/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java
+++ b/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java
@@ -21,11 +21,9 @@
 import static android.view.MotionEvent.ACTION_POINTER_UP;
 import static android.view.MotionEvent.ACTION_UP;
 import static android.view.MotionEvent.INVALID_POINTER_ID;
-
 import static com.android.launcher3.util.RaceConditionTracker.ENTER;
 import static com.android.launcher3.util.RaceConditionTracker.EXIT;
-import static com.android.systemui.shared.system.ActivityManagerWrapper
-        .CLOSE_SYSTEM_WINDOWS_REASON_RECENTS;
+import static com.android.systemui.shared.system.ActivityManagerWrapper.CLOSE_SYSTEM_WINDOWS_REASON_RECENTS;
 import static com.android.systemui.shared.system.RemoteAnimationTargetCompat.MODE_CLOSING;
 
 import android.annotation.TargetApi;
@@ -192,7 +190,7 @@
 
                 if (mPassedInitialSlop && mInteractionHandler != null) {
                     // Move
-                    mInteractionHandler.updateDisplacement(displacement - mStartDisplacement);
+                    dispatchMotion(ev, displacement - mStartDisplacement);
                 }
                 break;
             }
@@ -207,6 +205,14 @@
         }
     }
 
+    private void dispatchMotion(MotionEvent ev, float displacement) {
+        mInteractionHandler.updateDisplacement(displacement);
+        boolean isLandscape = isNavBarOnLeft() || isNavBarOnRight();
+        if (!isLandscape) {
+            mInteractionHandler.dispatchMotionEventToRecentsView(ev);
+        }
+    }
+
     private void notifyGestureStarted() {
         if (mInteractionHandler == null) {
             return;
@@ -297,15 +303,16 @@
      */
     private void finishTouchTracking(MotionEvent ev) {
         if (mPassedInitialSlop && mInteractionHandler != null) {
-            mInteractionHandler.updateDisplacement(getDisplacement(ev) - mStartDisplacement);
+            dispatchMotion(ev, getDisplacement(ev) - mStartDisplacement);
 
             mVelocityTracker.computeCurrentVelocity(1000,
                     ViewConfiguration.get(this).getScaledMaximumFlingVelocity());
 
-            float velocity = isNavBarOnRight() ? mVelocityTracker.getXVelocity(mActivePointerId)
-                    : isNavBarOnLeft() ? -mVelocityTracker.getXVelocity(mActivePointerId)
+            float velocityX = mVelocityTracker.getXVelocity(mActivePointerId);
+            float velocity = isNavBarOnRight() ? velocityX
+                    : isNavBarOnLeft() ? -velocityX
                             : mVelocityTracker.getYVelocity(mActivePointerId);
-            mInteractionHandler.onGestureEnded(velocity);
+            mInteractionHandler.onGestureEnded(velocity, velocityX);
         } else {
             // Since we start touch tracking on DOWN, we may reach this state without actually
             // starting the gesture. In that case, just cleanup immediately.
diff --git a/quickstep/src/com/android/quickstep/RecentsAnimationWrapper.java b/quickstep/src/com/android/quickstep/RecentsAnimationWrapper.java
index 2f3cb5f..042afea 100644
--- a/quickstep/src/com/android/quickstep/RecentsAnimationWrapper.java
+++ b/quickstep/src/com/android/quickstep/RecentsAnimationWrapper.java
@@ -97,8 +97,8 @@
     }
 
     /**
-     * @param onFinishComplete A callback that runs after the animation controller has finished
-     *                         on the background thread.
+     * @param onFinishComplete A callback that runs on the main thread after the animation
+     *                         controller has finished on the background thread.
      */
     public void finish(boolean toHome, Runnable onFinishComplete) {
         if (!toHome) {
@@ -128,7 +128,7 @@
             controller.finish(toHome);
 
             if (onFinishComplete != null) {
-                onFinishComplete.run();
+                mMainThreadExecutor.execute(onFinishComplete);
             }
         }
     }
diff --git a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
index e951750..0b1e627 100644
--- a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
+++ b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
@@ -22,6 +22,7 @@
 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;
@@ -46,10 +47,12 @@
 import android.os.UserHandle;
 import android.util.Log;
 import android.view.HapticFeedbackConstants;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewTreeObserver.OnDrawListener;
 import android.view.WindowManager;
 import android.view.animation.Interpolator;
+
 import androidx.annotation.AnyThread;
 import androidx.annotation.UiThread;
 import androidx.annotation.WorkerThread;
@@ -109,7 +112,7 @@
 
     // Interaction finish states
     private static final int STATE_SCALED_CONTROLLER_RECENTS = 1 << 5;
-    private static final int STATE_SCALED_CONTROLLER_APP = 1 << 6;
+    private static final int STATE_SCALED_CONTROLLER_LAST_TASK = 1 << 6;
 
     private static final int STATE_HANDLER_INVALIDATED = 1 << 7;
     private static final int STATE_GESTURE_STARTED_QUICKSTEP = 1 << 8;
@@ -127,7 +130,8 @@
     private static final int STATE_SCREENSHOT_VIEW_SHOWN = 1 << 17;
 
     private static final int STATE_RESUME_LAST_TASK = 1 << 18;
-    private static final int STATE_ASSIST_DATA_RECEIVED = 1 << 19;
+    private static final int STATE_START_NEW_TASK = 1 << 19;
+    private static final int STATE_ASSIST_DATA_RECEIVED = 1 << 20;
 
 
     private static final int LAUNCHER_UI_STATES =
@@ -153,7 +157,7 @@
             "STATE_ACTIVITY_MULTIPLIER_COMPLETE",
             "STATE_APP_CONTROLLER_RECEIVED",
             "STATE_SCALED_CONTROLLER_RECENTS",
-            "STATE_SCALED_CONTROLLER_APP",
+            "STATE_SCALED_CONTROLLER_LAST_TASK",
             "STATE_HANDLER_INVALIDATED",
             "STATE_GESTURE_STARTED_QUICKSTEP",
             "STATE_GESTURE_STARTED_QUICKSCRUB",
@@ -166,6 +170,7 @@
             "STATE_SCREENSHOT_CAPTURED",
             "STATE_SCREENSHOT_VIEW_SHOWN",
             "STATE_RESUME_LAST_TASK",
+            "STATE_START_NEW_TASK",
             "STATE_ASSIST_DATA_RECEIVED",
     };
 
@@ -173,7 +178,7 @@
     public static final long MIN_SWIPE_DURATION = 80;
     public static final long MIN_OVERSHOOT_DURATION = 120;
 
-    public static final float MIN_PROGRESS_FOR_OVERVIEW = 0.5f;
+    public static final float MIN_PROGRESS_FOR_OVERVIEW = 0.7f;
     private static final float SWIPE_DURATION_MULTIPLIER =
             Math.min(1 / MIN_PROGRESS_FOR_OVERVIEW, 1 / (1 - MIN_PROGRESS_FOR_OVERVIEW));
 
@@ -190,6 +195,7 @@
     // 1 => preview snapShot is completely aligned with the recents view and hotseat is completely
     // visible.
     private final AnimatedFloat mCurrentShift = new AnimatedFloat(this::updateFinalShift);
+    private boolean mDispatchedDownEvent;
     // To avoid UI jump when gesture is started, we offset the animation by the threshold.
     private float mShiftAtGestureStart = 0;
 
@@ -298,10 +304,12 @@
         mStateCallback.addCallback(STATE_LAUNCHER_STARTED | STATE_APP_CONTROLLER_RECEIVED,
                 this::sendRemoteAnimationsToAnimationFactory);
 
-        mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_SCALED_CONTROLLER_APP,
+        mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_SCALED_CONTROLLER_LAST_TASK,
                 this::resumeLastTaskForQuickstep);
         mStateCallback.addCallback(STATE_RESUME_LAST_TASK | STATE_APP_CONTROLLER_RECEIVED,
                 this::resumeLastTask);
+        mStateCallback.addCallback(STATE_START_NEW_TASK | STATE_APP_CONTROLLER_RECEIVED,
+                this::startNewTask);
 
         mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_APP_CONTROLLER_RECEIVED
                         | STATE_ACTIVITY_MULTIPLIER_COMPLETE
@@ -327,7 +335,7 @@
         mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_HANDLER_INVALIDATED,
                 this::invalidateHandlerWithLauncher);
         mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_HANDLER_INVALIDATED
-                | STATE_SCALED_CONTROLLER_APP,
+                | STATE_SCALED_CONTROLLER_LAST_TASK,
                 this::notifyTransitionCancelled);
 
         mStateCallback.addCallback(QUICK_SCRUB_START_UI_STATE, this::onQuickScrubStartUi);
@@ -410,6 +418,9 @@
         SyncRtSurfaceTransactionApplierCompat.create(mRecentsView, (applier) -> {
             mSyncTransactionApplier = applier;
         });
+        mRecentsView.setOnScrollChangeListener((v, scrollX, scrollY, oldScrollX, oldScrollY) -> {
+            updateFinalShift();
+        });
         mQuickScrubController = mRecentsView.getQuickScrubController();
         mLayoutListener = mActivityControlHelper.createLayoutListener(mActivity);
 
@@ -535,15 +546,39 @@
         } else {
             offsetX = res.getDimensionPixelSize(R.dimen.recents_page_spacing)
                     + tempRect.rect.width();
-            float distanceToReachEdge = mDp.widthPx / 2 + tempRect.rect.width() / 2 +
-                    res.getDimensionPixelSize(R.dimen.recents_page_spacing);
-            float interpolation = Math.min(1, offsetX / distanceToReachEdge);
-            scale = TaskView.getCurveScaleForInterpolation(interpolation);
+            scale = getTaskCurveScaleForOffsetX(offsetX, tempRect.rect.width());
         }
         mClipAnimationHelper.offsetTarget(scale, Utilities.isRtl(res) ? -offsetX : offsetX, offsetY,
                 QuickScrubController.QUICK_SCRUB_START_INTERPOLATOR);
     }
 
+    private float getTaskCurveScaleForOffsetX(float offsetX, float taskWidth) {
+        float distanceToReachEdge = mDp.widthPx / 2 + taskWidth / 2 +
+                mContext.getResources().getDimensionPixelSize(R.dimen.recents_page_spacing);
+        float interpolation = Math.min(1, offsetX / distanceToReachEdge);
+        return TaskView.getCurveScaleForInterpolation(interpolation);
+    }
+
+    @WorkerThread
+    public void dispatchMotionEventToRecentsView(MotionEvent event) {
+        if (mRecentsView == null) {
+            return;
+        }
+        // Pass the motion events to RecentsView to allow scrolling during swipe up.
+        if (mDispatchedDownEvent) {
+            mRecentsView.dispatchTouchEvent(event);
+        } else {
+            // The first event we dispatch should be ACTION_DOWN.
+            mDispatchedDownEvent = true;
+            MotionEvent downEvent = MotionEvent.obtain(event);
+            downEvent.setAction(MotionEvent.ACTION_DOWN);
+            int flags = downEvent.getEdgeFlags();
+            downEvent.setEdgeFlags(flags | TouchInteractionService.EDGE_NAV_BAR);
+            mRecentsView.dispatchTouchEvent(downEvent);
+            downEvent.recycle();
+        }
+    }
+
     @WorkerThread
     public void updateDisplacement(float displacement) {
         // We are moving in the negative x/y direction
@@ -588,11 +623,21 @@
 
         RecentsAnimationControllerCompat controller = mRecentsAnimationWrapper.getController();
         if (controller != null) {
+            float offsetX = 0;
+            if (mRecentsView != null && mInteractionType == INTERACTION_NORMAL) {
+                int startScroll = mRecentsView.getScrollForPage(mRecentsView.indexOfChild(
+                        mRecentsView.getRunningTaskView()));
+                offsetX = startScroll - mRecentsView.getScrollX();
+                offsetX *= mRecentsView.getScaleX();
+            }
+            float offsetScale = getTaskCurveScaleForOffsetX(offsetX,
+                    mClipAnimationHelper.getTargetRect().width());
             SyncRtSurfaceTransactionApplierCompat syncTransactionApplier
                     = Looper.myLooper() == mMainThreadHandler.getLooper()
                             ? mSyncTransactionApplier
                             : null;
-            mTransformParams.setProgress(shift).setSyncTransactionApplier(syncTransactionApplier);
+            mTransformParams.setProgress(shift).setOffsetX(offsetX).setOffsetScale(offsetScale)
+                    .setSyncTransactionApplier(syncTransactionApplier);
             mClipAnimationHelper.applyTransform(mRecentsAnimationWrapper.targetSet,
                     mTransformParams);
 
@@ -621,10 +666,17 @@
                     HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
             }
         }
-        // Update insets of the next previous task, as we might switch to it.
-        TaskView nextTaskView = mRecentsView == null ? null : mRecentsView.getNextTaskView();
-        if (mInteractionType == INTERACTION_NORMAL && nextTaskView != null) {
-            nextTaskView.setFullscreenProgress(1 - mCurrentShift.value);
+        // Update insets of the adjacent tasks, as we might switch to them.
+        int runningTaskIndex = mRecentsView == null ? -1 : mRecentsView.getRunningTaskIndex();
+        if (mInteractionType == INTERACTION_NORMAL && runningTaskIndex >= 0) {
+            TaskView nextTaskView = mRecentsView.getTaskViewAt(runningTaskIndex + 1);
+            TaskView prevTaskView = mRecentsView.getTaskViewAt(runningTaskIndex - 1);
+            if (nextTaskView != null) {
+                nextTaskView.setFullscreenProgress(1 - mCurrentShift.value);
+            }
+            if (prevTaskView != null) {
+                prevTaskView.setFullscreenProgress(1 - mCurrentShift.value);
+            }
         }
 
         if (mLauncherTransitionController == null || mLauncherTransitionController
@@ -714,7 +766,7 @@
     }
 
     @WorkerThread
-    public void onGestureEnded(float endVelocity) {
+    public void onGestureEnded(float endVelocity, float velocityX) {
         float flingThreshold = mContext.getResources()
                 .getDimension(R.dimen.quickstep_fling_threshold_velocity);
         boolean isFling = mGestureStarted && Math.abs(endVelocity) > flingThreshold;
@@ -723,9 +775,9 @@
         mLogAction = isFling ? Touch.FLING : Touch.SWIPE;
 
         if (mBgLongSwipeMode) {
-            executeOnUiThread(() -> onLongSwipeGestureFinishUi(endVelocity, isFling));
+            executeOnUiThread(() -> onLongSwipeGestureFinishUi(endVelocity, isFling, velocityX));
         } else {
-            handleNormalGestureEnd(endVelocity, isFling);
+            handleNormalGestureEnd(endVelocity, isFling, velocityX);
         }
     }
 
@@ -742,16 +794,21 @@
                 mTouchInteractionLog);
     }
 
-    private void handleNormalGestureEnd(float endVelocity, boolean isFling) {
+    private void handleNormalGestureEnd(float endVelocity, boolean isFling, float velocityX) {
         float velocityPxPerMs = endVelocity / 1000;
+        float velocityXPxPerMs = velocityX / 1000;
         long duration = MAX_SWIPE_DURATION;
         float currentShift = mCurrentShift.value;
         final boolean goingToHome;
         float endShift;
         final float startShift;
         Interpolator interpolator = DEACCEL;
+        final int nextPage = mRecentsView != null ? mRecentsView.getNextPage() : -1;
+        final int runningTaskIndex = mRecentsView != null ? mRecentsView.getRunningTaskIndex() : -1;
+        boolean goingToNewTask = mRecentsView != null && nextPage != runningTaskIndex;
+        final boolean reachedOverviewThreshold = currentShift >= MIN_PROGRESS_FOR_OVERVIEW;
         if (!isFling) {
-            goingToHome = currentShift >= MIN_PROGRESS_FOR_OVERVIEW && mGestureStarted;
+            goingToHome = reachedOverviewThreshold && mGestureStarted;
             endShift = goingToHome ? 1 : 0;
             long expectedDuration = Math.abs(Math.round((endShift - currentShift)
                     * MAX_SWIPE_DURATION * SWIPE_DURATION_MULTIPLIER));
@@ -759,7 +816,9 @@
             startShift = currentShift;
             interpolator = goingToHome ? OVERSHOOT_1_2 : DEACCEL;
         } else {
-            goingToHome = endVelocity < 0;
+            // If user scrolled to a new task, only go to home (overview) if they already passed
+            // the overview threshold. Otherwise, we'll snap to the new task and launch it.
+            goingToHome = endVelocity < 0 && (!goingToNewTask || reachedOverviewThreshold);
             endShift = goingToHome ? 1 : 0;
             startShift = Utilities.boundToRange(currentShift - velocityPxPerMs
                     * SINGLE_FRAME_MS / mTransitionDragLength, 0, 1);
@@ -786,9 +845,29 @@
         }
         if (goingToHome) {
             mRecentsAnimationWrapper.enableTouchProxy();
+        } else if (goingToNewTask) {
+            // We aren't goingToHome, and user scrolled/flung to a new task; snap to the closest
+            // task in that direction and launch it (in startNewTask()).
+            int taskToLaunch = runningTaskIndex + (nextPage > runningTaskIndex ? 1 : - 1);
+            if (taskToLaunch >= mRecentsView.getTaskViewCount()) {
+                // Scrolled to Clear all button, snap back to current task and resume it.
+                mRecentsView.snapToPage(runningTaskIndex, Math.toIntExact(duration));
+                goingToNewTask = false;
+            } else {
+                float distance = Math.abs(mRecentsView.getScrollForPage(taskToLaunch)
+                        - mRecentsView.getScrollX());
+                int durationX = (int) Math.abs(distance / velocityXPxPerMs);
+                if (durationX > MAX_SWIPE_DURATION) {
+                    durationX = Math.toIntExact(MAX_SWIPE_DURATION);
+                }
+                interpolator = Interpolators.scrollInterpolatorForVelocity(velocityXPxPerMs);
+                mRecentsView.snapToPage(taskToLaunch, durationX, interpolator);
+                duration = Math.max(duration, durationX);
+            }
         }
 
-        animateToProgress(startShift, endShift, duration, interpolator, goingToHome);
+        animateToProgress(startShift, endShift, duration, interpolator, goingToHome,
+                goingToNewTask, velocityPxPerMs);
     }
 
     private void doLogGesture(boolean toLauncher) {
@@ -813,23 +892,28 @@
     }
 
     /** 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) {
+    private void animateToProgress(float start, float end, long duration, Interpolator interpolator,
+            boolean goingToHome, boolean goingToNewTask, float velocityPxPerMs) {
         mRecentsAnimationWrapper.runOnInit(() -> animateToProgressInternal(start, end, duration,
-                interpolator, goingToHome));
+                interpolator, goingToHome, goingToNewTask, velocityPxPerMs));
     }
 
     private void animateToProgressInternal(float start, float end, long duration,
-            Interpolator interpolator, boolean goingToHome) {
+            Interpolator interpolator, boolean goingToHome, boolean goingToNewTask,
+            float velocityPxPerMs) {
         mIsGoingToHome = goingToHome;
         ObjectAnimator anim = mCurrentShift.animateToValue(start, end).setDuration(duration);
         anim.setInterpolator(interpolator);
         anim.addListener(new AnimationSuccessListener() {
             @Override
             public void onAnimationSuccess(Animator animator) {
+                int recentsState = STATE_SCALED_CONTROLLER_RECENTS | STATE_CAPTURE_SCREENSHOT
+                        | STATE_SCREENSHOT_VIEW_SHOWN;
                 setStateOnUiThread(mIsGoingToHome
-                        ? (STATE_SCALED_CONTROLLER_RECENTS | STATE_CAPTURE_SCREENSHOT
-                        | STATE_SCREENSHOT_VIEW_SHOWN) : STATE_SCALED_CONTROLLER_APP);
+                        ? recentsState
+                        : goingToNewTask
+                            ? STATE_START_NEW_TASK
+                            : STATE_SCALED_CONTROLLER_LAST_TASK);
             }
         });
         anim.start();
@@ -854,7 +938,12 @@
                 mLauncherTransitionController.dispatchSetInterpolator(Interpolators.mapToProgress(
                         interpolator, adjustedStart, end));
                 mLauncherTransitionController.getAnimationPlayer().setDuration(adjustedDuration);
-                mLauncherTransitionController.getAnimationPlayer().start();
+
+                if (QUICKSTEP_SPRINGS.get()) {
+                    mLauncherTransitionController.dispatchOnStartWithVelocity(end, velocityPxPerMs);
+                } else {
+                    mLauncherTransitionController.getAnimationPlayer().start();
+                }
             }
         });
     }
@@ -872,6 +961,18 @@
         mTouchInteractionLog.finishRecentsAnimation(false);
     }
 
+    @UiThread
+    private void startNewTask() {
+        // Launch the task user scrolled to (mRecentsView.getNextPage()).
+        mRecentsAnimationWrapper.finish(true /* toHome */, () -> {
+            mRecentsView.getTaskViewAt(mRecentsView.getNextPage()).launchTask(false,
+                    result -> setStateOnUiThread(STATE_HANDLER_INVALIDATED),
+                    mMainThreadHandler);
+        });
+        mTouchInteractionLog.finishRecentsAnimation(false);
+        doLogGesture(false /* toLauncher */);
+    }
+
     public void reset() {
         if (mInteractionType != INTERACTION_QUICK_SCRUB) {
             // Only invalidate the handler if we are not quick scrubbing, otherwise, it will be
@@ -889,6 +990,10 @@
 
         mActivityInitListener.unregister();
         mTaskSnapshot = null;
+
+        if (mRecentsView != null) {
+            mRecentsView.setOnScrollChangeListener(null);
+        }
     }
 
     private void invalidateHandlerWithLauncher() {
@@ -999,7 +1104,8 @@
         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 */);
+        animateToProgress(mCurrentShift.value, 1f, duration, LINEAR, true /* goingToHome */,
+                false /* goingToNewTask */, 1f);
     }
 
     private void onQuickScrubStartUi() {
@@ -1152,10 +1258,10 @@
         setTargetAlphaProvider(WindowTransformSwipeHandler::getHiddenTargetAlpha);
     }
 
-    private void onLongSwipeGestureFinishUi(float velocity, boolean isFling) {
+    private void onLongSwipeGestureFinishUi(float velocity, boolean isFling, float velocityX) {
         if (!mUiLongSwipeMode || mLongSwipeController == null) {
             mUiLongSwipeMode = false;
-            handleNormalGestureEnd(velocity, isFling);
+            handleNormalGestureEnd(velocity, isFling, velocityX);
             return;
         }
         mUiLongSwipeMode = false;
diff --git a/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java b/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java
index 431517a..6a8482b 100644
--- a/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java
+++ b/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java
@@ -154,10 +154,11 @@
     public RectF applyTransform(RemoteAnimationTargetSet targetSet, TransformParams params) {
         RectF currentRect;
         mTmpRectF.set(mTargetRect);
-        Utilities.scaleRectFAboutCenter(mTmpRectF, mTargetScale);
+        Utilities.scaleRectFAboutCenter(mTmpRectF, mTargetScale * params.offsetScale);
         float offsetYProgress = mOffsetYInterpolator.getInterpolation(params.progress);
         float progress = mInterpolator.getInterpolation(params.progress);
         currentRect = mRectFEvaluator.evaluate(progress, mSourceRect, mTmpRectF);
+        currentRect.offset(params.offsetX, 0);
 
         synchronized (mTargetOffset) {
             // Stay lined up with the center of the target, since it moves for quick scrub.
@@ -353,10 +354,14 @@
 
     public static class TransformParams {
         float progress;
+        float offsetX;
+        float offsetScale;
         SyncRtSurfaceTransactionApplierCompat syncTransactionApplier;
 
         public TransformParams() {
             progress = 0;
+            offsetX = 0;
+            offsetScale = 1;
         }
 
         public TransformParams setProgress(float progress) {
@@ -364,6 +369,16 @@
             return this;
         }
 
+        public TransformParams setOffsetX(float offsetX) {
+            this.offsetX = offsetX;
+            return this;
+        }
+
+        public TransformParams setOffsetScale(float offsetScale) {
+            this.offsetScale = offsetScale;
+            return this;
+        }
+
         public TransformParams setSyncTransactionApplier(
                 SyncRtSurfaceTransactionApplierCompat applier) {
             this.syncTransactionApplier = applier;
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index 34b5748..e2a4dda 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -21,9 +21,11 @@
 import static com.android.launcher3.anim.Interpolators.ACCEL_2;
 import static com.android.launcher3.anim.Interpolators.FAST_OUT_SLOW_IN;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
+import static com.android.launcher3.uioverrides.TaskViewTouchController.SUCCESS_TRANSITION_PROGRESS;
 import static com.android.launcher3.util.SystemUiController.UI_STATE_OVERVIEW;
 import static com.android.quickstep.TaskUtils.checkCurrentOrManagedUserId;
-import static com.android.quickstep.WindowTransformSwipeHandler.MIN_PROGRESS_FOR_OVERVIEW;
+
+import static com.android.quickstep.TouchInteractionService.EDGE_NAV_BAR;
 
 import android.animation.Animator;
 import android.animation.AnimatorSet;
@@ -60,6 +62,7 @@
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.ListView;
+
 import androidx.annotation.Nullable;
 
 import com.android.launcher3.BaseActivity;
@@ -421,7 +424,8 @@
                         final boolean clearAllButtonDeadZoneConsumed =
                                 mClearAllButton.getAlpha() == 1
                                         && mClearAllButtonDeadZoneRect.contains(x, y);
-                        if (!clearAllButtonDeadZoneConsumed
+                        final boolean cameFromNavBar = (ev.getEdgeFlags() & EDGE_NAV_BAR) != 0;
+                        if (!clearAllButtonDeadZoneConsumed && !cameFromNavBar
                                 && !mTaskViewDeadZoneRect.contains(x + getScrollX(), y)) {
                             mTouchDownToStartHome = true;
                         }
@@ -732,6 +736,11 @@
         return getTaskView(mRunningTaskId);
     }
 
+    public int getRunningTaskIndex() {
+        TaskView tv = getRunningTaskView();
+        return tv == null ? -1 : indexOfChild(tv);
+    }
+
     /**
      * Hides the tile associated with {@link #mRunningTaskId}
      */
@@ -756,8 +765,7 @@
         setRunningTaskIconScaledDown(runningTaskIconScaledDown);
         setRunningTaskHidden(runningTaskTileHidden);
 
-        TaskView tv = getRunningTaskView();
-        setCurrentPage(tv == null ? 0 : indexOfChild(tv));
+        setCurrentPage(getRunningTaskIndex());
 
         // Load the tasks (if the loading is already
         mTaskListChangeId = mModel.getTasks(this::applyLoadPlan);
@@ -1346,7 +1354,7 @@
                             : 0);
 
             // Passing the threshold from taskview to fullscreen app will vibrate
-            final boolean passed = animator.getAnimatedFraction() >= MIN_PROGRESS_FOR_OVERVIEW;
+            final boolean passed = animator.getAnimatedFraction() >= SUCCESS_TRANSITION_PROGRESS;
             if (passed != passedOverviewThreshold[0]) {
                 passedOverviewThreshold[0] = passed;
                 performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY,
diff --git a/quickstep/src/com/android/quickstep/views/TaskView.java b/quickstep/src/com/android/quickstep/views/TaskView.java
index bb6f514..e1e596b 100644
--- a/quickstep/src/com/android/quickstep/views/TaskView.java
+++ b/quickstep/src/com/android/quickstep/views/TaskView.java
@@ -46,7 +46,7 @@
 
 import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.R;
-import com.android.launcher3.Utilities;
+import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Direction;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch;
 import com.android.quickstep.RecentsModel;
@@ -119,7 +119,7 @@
             new FloatProperty<TaskView>("focusTransition") {
                 @Override
                 public void setValue(TaskView taskView, float v) {
-                    taskView.setIconAndDimTransitionProgress(v);
+                    taskView.setIconAndDimTransitionProgress(v, false /* invert */);
                 }
 
                 @Override
@@ -316,11 +316,17 @@
         }
     }
 
-    private void setIconAndDimTransitionProgress(float progress) {
+    private void setIconAndDimTransitionProgress(float progress, boolean invert) {
+        if (invert) {
+            progress = 1 - progress;
+        }
         mFocusTransitionProgress = progress;
         mSnapshotView.setDimAlphaMultipler(progress);
-        float scale = FAST_OUT_SLOW_IN.getInterpolation(Utilities.boundToRange(
-                progress * DIM_ANIM_DURATION / SCALE_ICON_DURATION, 0, 1));
+        float iconScalePercentage = (float) SCALE_ICON_DURATION / DIM_ANIM_DURATION;
+        float lowerClamp = invert ? 1f - iconScalePercentage : 0;
+        float upperClamp = invert ? 1 : iconScalePercentage;
+        float scale = Interpolators.clampToProgress(FAST_OUT_SLOW_IN, lowerClamp, upperClamp)
+                .getInterpolation(progress);
         mIconView.setScaleX(scale);
         mIconView.setScaleY(scale);
     }
@@ -341,10 +347,14 @@
     }
 
     protected void setIconScaleAndDim(float iconScale) {
+        setIconScaleAndDim(iconScale, false);
+    }
+
+    private void setIconScaleAndDim(float iconScale, boolean invert) {
         if (mIconAndDimAnimator != null) {
             mIconAndDimAnimator.cancel();
         }
-        setIconAndDimTransitionProgress(iconScale);
+        setIconAndDimTransitionProgress(iconScale, invert);
     }
 
     public void resetVisualProperties() {
@@ -524,7 +534,8 @@
         }
         mFullscreenProgress = progress;
         boolean isFullscreen = mFullscreenProgress > 0;
-        mIconView.setVisibility(isFullscreen ? INVISIBLE : VISIBLE);
+        setIconScaleAndDim(progress, true /* invert */);
+        mIconView.setVisibility(progress < 1 ? VISIBLE : INVISIBLE);
         setClipChildren(!isFullscreen);
         setClipToPadding(!isFullscreen);
         getThumbnail().invalidate();
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index ffbf34c..962c25b 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -1,7 +1,6 @@
 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;
@@ -15,9 +14,7 @@
 
 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;
@@ -29,10 +26,15 @@
 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
@@ -59,6 +61,53 @@
         }
     };
 
+    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;
 
@@ -174,8 +223,8 @@
         Interpolator interpolator = config.userControlled ? LINEAR : toState == OVERVIEW
                 ? builder.getInterpolator(ANIM_OVERVIEW_SCALE, FAST_OUT_SLOW_IN)
                 : FAST_OUT_SLOW_IN;
-        ObjectAnimator anim =
-                ObjectAnimator.ofFloat(this, ALL_APPS_PROGRESS, mProgress, targetProgress);
+        Animator anim = new SpringObjectAnimator(this, 1f / mShiftRange, 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 819c843..62f59e4 100644
--- a/src/com/android/launcher3/anim/AnimatorPlaybackController.java
+++ b/src/com/android/launcher3/anim/AnimatorPlaybackController.java
@@ -16,6 +16,7 @@
 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;
@@ -23,10 +24,16 @@
 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
@@ -37,6 +44,9 @@
  */
 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);
     }
@@ -60,6 +70,7 @@
     private final long mDuration;
 
     protected final AnimatorSet mAnim;
+    private Set<SpringAnimation> mSprings;
 
     protected float mCurrentFraction;
     private Runnable mEndAction;
@@ -67,6 +78,9 @@
     protected boolean mTargetCancelled = false;
     protected Runnable mOnCancelRunnable;
 
+    private OnAnimationEndDispatcher mEndListener;
+    private DynamicAnimation.OnAnimationEndListener mSpringEndListener;
+
     protected AnimatorPlaybackController(AnimatorSet anim, long duration,
             Runnable onCancelRunnable) {
         mAnim = anim;
@@ -75,7 +89,8 @@
 
         mAnimationPlayer = ValueAnimator.ofFloat(0, 1);
         mAnimationPlayer.setInterpolator(LINEAR);
-        mAnimationPlayer.addListener(new OnAnimationEndDispatcher());
+        mEndListener = new OnAnimationEndDispatcher();
+        mAnimationPlayer.addListener(mEndListener);
         mAnimationPlayer.addUpdateListener(this);
 
         mAnim.addListener(new AnimatorListenerAdapter() {
@@ -99,6 +114,15 @@
                 mTargetCancelled = false;
             }
         });
+
+        mSprings = new HashSet<>();
+        mSpringEndListener = (animation, canceled, value, velocity1) -> {
+            if (canceled) {
+                mEndListener.onAnimationCancel(mAnimationPlayer);
+            } else {
+                mEndListener.onAnimationEnd(mAnimationPlayer);
+            }
+        };
     }
 
     public AnimatorSet getTarget() {
@@ -180,6 +204,29 @@
         }
     }
 
+    /**
+     * 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);
     }
@@ -282,6 +329,18 @@
         }
     }
 
+    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
@@ -291,9 +350,12 @@
 
         @Override
         public void onAnimationSuccess(Animator animator) {
-            dispatchOnEndRecursively(mAnim);
-            if (mEndAction != null) {
-                mEndAction.run();
+            // 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();
+                }
             }
         }
 
diff --git a/src/com/android/launcher3/anim/SpringObjectAnimator.java b/src/com/android/launcher3/anim/SpringObjectAnimator.java
new file mode 100644
index 0000000..b2b931d
--- /dev/null
+++ b/src/com/android/launcher3/anim/SpringObjectAnimator.java
@@ -0,0 +1,270 @@
+/*
+ * 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(this);
+            }
+            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 ArrayList<AnimatorListener> getListeners() {
+        return mListeners;
+    }
+
+    @Override
+    public void removeAllListeners() {
+        mListeners.clear();
+    }
+
+    @Override
+    public void removeListener(AnimatorListener listener) {
+        mListeners.remove(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 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 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 03fdc64..449cde7 100644
--- a/src/com/android/launcher3/config/BaseFlags.java
+++ b/src/com/android/launcher3/config/BaseFlags.java
@@ -98,6 +98,9 @@
     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/states/RotationHelper.java b/src/com/android/launcher3/states/RotationHelper.java
index 9c4a4ea..65103f6 100644
--- a/src/com/android/launcher3/states/RotationHelper.java
+++ b/src/com/android/launcher3/states/RotationHelper.java
@@ -29,6 +29,7 @@
 
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
+import com.android.launcher3.util.UiThreadHelper;
 
 /**
  * Utility class to manage launcher rotation
@@ -154,7 +155,7 @@
         }
         if (activityFlags != mLastActivityFlags) {
             mLastActivityFlags = activityFlags;
-            mActivity.setRequestedOrientation(activityFlags);
+            UiThreadHelper.setOrientationAsync(mActivity, activityFlags);
         }
     }
 
diff --git a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
index a7bd243..bb14328 100644
--- a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
+++ b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
@@ -24,6 +24,7 @@
 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;
@@ -45,6 +46,7 @@
 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;
@@ -428,8 +430,8 @@
         maybeUpdateAtomicAnim(mFromState, targetState, targetState == mToState ? 1f : 0f);
         updateSwipeCompleteAnimation(anim, Math.max(duration, getRemainingAtomicDuration()),
                 targetState, velocity, fling);
-        mCurrentAnimation.dispatchOnStart();
-        if (fling && targetState == LauncherState.ALL_APPS) {
+        mCurrentAnimation.dispatchOnStartWithVelocity(endProgress, velocity);
+        if (fling && targetState == LauncherState.ALL_APPS && !QUICKSTEP_SPRINGS.get()) {
             mLauncher.getAppsView().addSpringFromFlingUpdateListener(anim, velocity);
         }
         anim.start();
diff --git a/src/com/android/launcher3/util/UiThreadHelper.java b/src/com/android/launcher3/util/UiThreadHelper.java
index 27140a1..cc442f9 100644
--- a/src/com/android/launcher3/util/UiThreadHelper.java
+++ b/src/com/android/launcher3/util/UiThreadHelper.java
@@ -15,6 +15,7 @@
  */
 package com.android.launcher3.util;
 
+import android.app.Activity;
 import android.content.Context;
 import android.os.Handler;
 import android.os.HandlerThread;
@@ -33,6 +34,8 @@
     private static Handler sHandler;
 
     private static final int MSG_HIDE_KEYBOARD = 1;
+    private static final int MSG_SET_ORIENTATION = 2;
+    private static final int MSG_RUN_COMMAND = 3;
 
     public static Looper getBackgroundLooper() {
         if (sHandlerThread == null) {
@@ -55,6 +58,15 @@
         Message.obtain(getHandler(context), MSG_HIDE_KEYBOARD, token).sendToTarget();
     }
 
+    public static void setOrientationAsync(Activity activity, int orientation) {
+        Message.obtain(getHandler(activity), MSG_SET_ORIENTATION, orientation, 0, activity)
+                .sendToTarget();
+    }
+
+    public static void runAsyncCommand(Context context, AsyncCommand command, int arg1, int arg2) {
+        Message.obtain(getHandler(context), MSG_RUN_COMMAND, arg1, arg2, command).sendToTarget();
+    }
+
     private static class UiCallbacks implements Handler.Callback {
 
         private final InputMethodManager mIMM;
@@ -69,8 +81,19 @@
                 case MSG_HIDE_KEYBOARD:
                     mIMM.hideSoftInputFromWindow((IBinder) message.obj, 0);
                     return true;
+                case MSG_SET_ORIENTATION:
+                    ((Activity) message.obj).setRequestedOrientation(message.arg1);
+                    return true;
+                case MSG_RUN_COMMAND:
+                    ((AsyncCommand) message.obj).execute(message.arg1, message.arg2);
+                    return true;
             }
             return false;
         }
     }
+
+    public interface AsyncCommand {
+
+        void execute(int arg1, int arg2);
+    }
 }