diff --git a/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java b/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java
index 722f51b..693ae60 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java
@@ -35,7 +35,7 @@
 
     public BackButtonAlphaHandler(Launcher launcher) {
         mLauncher = launcher;
-        mOverviewInteractionState = OverviewInteractionState.getInstance(mLauncher);
+        mOverviewInteractionState = OverviewInteractionState.INSTANCE.get(mLauncher);
     }
 
     @Override
diff --git a/quickstep/src/com/android/launcher3/uioverrides/LandscapeEdgeSwipeController.java b/quickstep/src/com/android/launcher3/uioverrides/LandscapeEdgeSwipeController.java
index 6d10619..fd4bf9b 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/LandscapeEdgeSwipeController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/LandscapeEdgeSwipeController.java
@@ -73,7 +73,7 @@
     protected void onSwipeInteractionCompleted(LauncherState targetState, int logAction) {
         super.onSwipeInteractionCompleted(targetState, logAction);
         if (mStartState == NORMAL && targetState == OVERVIEW) {
-            RecentsModel.getInstance(mLauncher).onOverviewShown(true, TAG);
+            RecentsModel.INSTANCE.get(mLauncher).onOverviewShown(true, TAG);
         }
     }
 }
diff --git a/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java b/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
index 7f956f8..25b5f57 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/OverviewState.java
@@ -31,6 +31,7 @@
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 import com.android.quickstep.RecentsModel;
 import com.android.quickstep.views.RecentsView;
+import com.android.quickstep.views.TaskView;
 
 /**
  * Definition for overview state
@@ -77,7 +78,7 @@
     public void onStateDisabled(Launcher launcher) {
         RecentsView rv = launcher.getOverviewPanel();
         rv.setOverviewStateEnabled(false);
-        RecentsModel.getInstance(launcher).resetAssistCache();
+        RecentsModel.INSTANCE.get(launcher).resetAssistCache();
     }
 
     @Override
@@ -130,4 +131,14 @@
         DeviceProfile dp = launcher.getDeviceProfile();
         return dp.allAppsCellHeightPx - dp.allAppsIconTextSizePx;
     }
+
+    @Override
+    public void onBackPressed(Launcher launcher) {
+        TaskView taskView = launcher.<RecentsView>getOverviewPanel().getRunningTaskView();
+        if (taskView != null) {
+            taskView.launchTask(true);
+        } else {
+            super.onBackPressed(launcher);
+        }
+    }
 }
diff --git a/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java b/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
index 1d1b7da..a1ae99e 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
@@ -256,7 +256,7 @@
     protected void onSwipeInteractionCompleted(LauncherState targetState, int logAction) {
         super.onSwipeInteractionCompleted(targetState, logAction);
         if (mStartState == NORMAL && targetState == OVERVIEW) {
-            RecentsModel.getInstance(mLauncher).onOverviewShown(true, TAG);
+            RecentsModel.INSTANCE.get(mLauncher).onOverviewShown(true, TAG);
         }
     }
 
diff --git a/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java b/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java
index 9a920c8..88f2315 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/TaskViewTouchController.java
@@ -121,7 +121,7 @@
                     if (mRecentsView.isTaskViewVisible(view) && mActivity.getDragLayer()
                             .isEventOverView(view, ev)) {
                         mTaskBeingDragged = view;
-                        if (!OverviewInteractionState.getInstance(mActivity)
+                        if (!OverviewInteractionState.INSTANCE.get(mActivity)
                                 .isSwipeUpGestureEnabled()) {
                             // Don't allow swipe down to open if we don't support swipe up
                             // to enter overview.
diff --git a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
index 2d0946b..c939330 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
@@ -57,7 +57,7 @@
 public class UiFactory {
 
     public static TouchController[] createTouchControllers(Launcher launcher) {
-        boolean swipeUpEnabled = OverviewInteractionState.getInstance(launcher)
+        boolean swipeUpEnabled = OverviewInteractionState.INSTANCE.get(launcher)
                 .isSwipeUpGestureEnabled();
         if (!swipeUpEnabled) {
             return new TouchController[] {
@@ -80,7 +80,7 @@
     }
 
     public static void setOnTouchControllersChangedListener(Context context, Runnable listener) {
-        OverviewInteractionState.getInstance(context).setOnSwipeUpSettingChangedListener(listener);
+        OverviewInteractionState.INSTANCE.get(context).setOnSwipeUpSettingChangedListener(listener);
     }
 
     public static StateHandler[] getStateHandler(Launcher launcher) {
@@ -100,7 +100,7 @@
             shouldBackButtonBeHidden = AbstractFloatingView.getTopOpenViewWithType(launcher,
                     TYPE_ALL & ~TYPE_HIDE_BACK_BUTTON) == null;
         }
-        OverviewInteractionState.getInstance(launcher)
+        OverviewInteractionState.INSTANCE.get(launcher)
                 .setBackButtonAlpha(shouldBackButtonBeHidden ? 0 : 1, true /* animate */);
     }
 
@@ -122,7 +122,7 @@
 
                 @Override
                 public void onStateTransitionComplete(LauncherState finalState) {
-                    boolean swipeUpEnabled = OverviewInteractionState.getInstance(launcher)
+                    boolean swipeUpEnabled = OverviewInteractionState.INSTANCE.get(launcher)
                             .isSwipeUpGestureEnabled();
                     LauncherState prevState = launcher.getStateManager().getLastState();
 
@@ -159,7 +159,7 @@
     }
 
     public static void onStart(Context context) {
-        RecentsModel model = RecentsModel.getInstance(context);
+        RecentsModel model = RecentsModel.INSTANCE.get(context);
         if (model != null) {
             model.onStart();
         }
@@ -169,17 +169,19 @@
         // After the transition to home, enable the high-res thumbnail loader if it wasn't enabled
         // as a part of quickstep/scrub, so that high-res thumbnails can load the next time we
         // enter overview
-        RecentsModel.getInstance(context).getRecentsTaskLoader()
+        RecentsModel.INSTANCE.get(context).getRecentsTaskLoader()
                 .getHighResThumbnailLoader().setVisible(true);
     }
 
     public static void onLauncherStateOrResumeChanged(Launcher launcher) {
         LauncherState state = launcher.getStateManager().getState();
-        DeviceProfile profile = launcher.getDeviceProfile();
-        WindowManagerWrapper.getInstance().setShelfHeight(
-                (state == NORMAL || state == OVERVIEW) && launcher.isUserActive()
-                        && !profile.isVerticalBarLayout(),
-                profile.hotseatBarSizePx);
+        if (!OverviewInteractionState.INSTANCE.get(launcher).swipeGestureInitializing()) {
+            DeviceProfile profile = launcher.getDeviceProfile();
+            WindowManagerWrapper.getInstance().setShelfHeight(
+                    (state == NORMAL || state == OVERVIEW) && launcher.isUserActive()
+                            && !profile.isVerticalBarLayout(),
+                    profile.hotseatBarSizePx);
+        }
 
         if (state == NORMAL) {
             launcher.<RecentsView>getOverviewPanel().setSwipeDownShouldLaunchApp(false);
@@ -187,7 +189,7 @@
     }
 
     public static void onTrimMemory(Context context, int level) {
-        RecentsModel model = RecentsModel.getInstance(context);
+        RecentsModel model = RecentsModel.INSTANCE.get(context);
         if (model != null) {
             model.onTrimMemory(level);
         }
diff --git a/quickstep/src/com/android/quickstep/OverviewCommandHelper.java b/quickstep/src/com/android/quickstep/OverviewCommandHelper.java
index 7c6eb32..3d54b82 100644
--- a/quickstep/src/com/android/quickstep/OverviewCommandHelper.java
+++ b/quickstep/src/com/android/quickstep/OverviewCommandHelper.java
@@ -111,7 +111,7 @@
         mContext = context;
         mAM = ActivityManagerWrapper.getInstance();
         mMainThreadExecutor = new MainThreadExecutor();
-        mRecentsModel = RecentsModel.getInstance(mContext);
+        mRecentsModel = RecentsModel.INSTANCE.get(mContext);
 
         Intent myHomeIntent = new Intent(Intent.ACTION_MAIN)
                 .addCategory(Intent.CATEGORY_HOME)
diff --git a/quickstep/src/com/android/quickstep/OverviewInteractionState.java b/quickstep/src/com/android/quickstep/OverviewInteractionState.java
index aa318be..a5ff681 100644
--- a/quickstep/src/com/android/quickstep/OverviewInteractionState.java
+++ b/quickstep/src/com/android/quickstep/OverviewInteractionState.java
@@ -24,21 +24,18 @@
 import android.content.Context;
 import android.database.ContentObserver;
 import android.os.Handler;
-import android.os.Looper;
 import android.os.Message;
 import android.os.RemoteException;
 import android.provider.Settings;
 import android.support.annotation.WorkerThread;
 import android.util.Log;
 
-import com.android.launcher3.MainThreadExecutor;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.allapps.DiscoveryBounce;
+import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.UiThreadHelper;
 import com.android.systemui.shared.recents.ISystemUiProxy;
 
-import java.util.concurrent.ExecutionException;
-
 /**
  * Sets overview interaction flags, such as:
  *
@@ -55,23 +52,8 @@
     private static final String HAS_ENABLED_QUICKSTEP_ONCE = "launcher.has_enabled_quickstep_once";
 
     // We do not need any synchronization for this variable as its only written on UI thread.
-    private static OverviewInteractionState INSTANCE;
-
-    public static OverviewInteractionState getInstance(final Context context) {
-        if (INSTANCE == null) {
-            if (Looper.myLooper() == Looper.getMainLooper()) {
-                INSTANCE = new OverviewInteractionState(context.getApplicationContext());
-            } else {
-                try {
-                    return new MainThreadExecutor().submit(
-                            () -> OverviewInteractionState.getInstance(context)).get();
-                } catch (InterruptedException|ExecutionException e) {
-                    throw new RuntimeException(e);
-                }
-            }
-        }
-        return INSTANCE;
-    }
+    public static final MainThreadInitializedObject<OverviewInteractionState> INSTANCE =
+            new MainThreadInitializedObject<>((c) -> new OverviewInteractionState(c));
 
     private static final int MSG_SET_PROXY = 200;
     private static final int MSG_SET_BACK_BUTTON_ALPHA = 201;
@@ -83,6 +65,8 @@
     private final Handler mUiHandler;
     private final Handler mBgHandler;
 
+    private boolean mSwipeGestureInitializing = false;
+
     // These are updated on the background thread
     private ISystemUiProxy mISystemUiProxy;
     private boolean mSwipeUpEnabled = true;
@@ -192,6 +176,15 @@
         }
     }
 
+    @WorkerThread
+    public void setSwipeGestureInitializing(boolean swipeGestureInitializing) {
+        mSwipeGestureInitializing = swipeGestureInitializing;
+    }
+
+    public boolean swipeGestureInitializing() {
+        return mSwipeGestureInitializing;
+    }
+
     private class SwipeUpGestureEnabledSettingObserver extends ContentObserver {
         private Handler mHandler;
         private ContentResolver mResolver;
diff --git a/quickstep/src/com/android/quickstep/RecentsModel.java b/quickstep/src/com/android/quickstep/RecentsModel.java
index 0b97f01..fa4e016 100644
--- a/quickstep/src/com/android/quickstep/RecentsModel.java
+++ b/quickstep/src/com/android/quickstep/RecentsModel.java
@@ -27,7 +27,6 @@
 import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.os.Bundle;
-import android.os.Looper;
 import android.os.RemoteException;
 import android.os.UserHandle;
 import android.support.annotation.WorkerThread;
@@ -38,6 +37,7 @@
 
 import com.android.launcher3.MainThreadExecutor;
 import com.android.launcher3.R;
+import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.launcher3.util.Preconditions;
 import com.android.systemui.shared.recents.ISystemUiProxy;
 import com.android.systemui.shared.recents.model.IconLoader;
@@ -50,7 +50,6 @@
 import com.android.systemui.shared.system.TaskStackChangeListener;
 
 import java.util.ArrayList;
-import java.util.concurrent.ExecutionException;
 import java.util.function.Consumer;
 
 /**
@@ -59,23 +58,8 @@
 @TargetApi(Build.VERSION_CODES.O)
 public class RecentsModel extends TaskStackChangeListener {
     // We do not need any synchronization for this variable as its only written on UI thread.
-    private static RecentsModel INSTANCE;
-
-    public static RecentsModel getInstance(final Context context) {
-        if (INSTANCE == null) {
-            if (Looper.myLooper() == Looper.getMainLooper()) {
-                INSTANCE = new RecentsModel(context.getApplicationContext());
-            } else {
-                try {
-                    return new MainThreadExecutor().submit(
-                            () -> RecentsModel.getInstance(context)).get();
-                } catch (InterruptedException|ExecutionException e) {
-                    throw new RuntimeException(e);
-                }
-            }
-        }
-        return INSTANCE;
-    }
+    public static final MainThreadInitializedObject<RecentsModel> INSTANCE =
+            new MainThreadInitializedObject<>(c -> new RecentsModel(c));
 
     private final SparseArray<Bundle> mCachedAssistData = new SparseArray<>(1);
     private final ArrayList<AssistDataListener> mAssistDataListeners = new ArrayList<>();
diff --git a/quickstep/src/com/android/quickstep/TaskSystemShortcut.java b/quickstep/src/com/android/quickstep/TaskSystemShortcut.java
index 24e199b..e64d04a 100644
--- a/quickstep/src/com/android/quickstep/TaskSystemShortcut.java
+++ b/quickstep/src/com/android/quickstep/TaskSystemShortcut.java
@@ -160,7 +160,7 @@
                 boolean dockTopOrLeft = navBarPosition != WindowManagerWrapper.NAV_BAR_POS_LEFT;
                 if (ActivityManagerWrapper.getInstance().startActivityFromRecents(taskId,
                         ActivityOptionsCompat.makeSplitScreenOptions(dockTopOrLeft))) {
-                    ISystemUiProxy sysUiProxy = RecentsModel.getInstance(activity).getSystemUiProxy();
+                    ISystemUiProxy sysUiProxy = RecentsModel.INSTANCE.get(activity).getSystemUiProxy();
                     try {
                         sysUiProxy.onSplitScreenInvoked();
                     } catch (RemoteException e) {
@@ -225,7 +225,7 @@
         @Override
         public View.OnClickListener getOnClickListener(
                 BaseDraggingActivity activity, TaskView taskView) {
-            ISystemUiProxy sysUiProxy = RecentsModel.getInstance(activity).getSystemUiProxy();
+            ISystemUiProxy sysUiProxy = RecentsModel.INSTANCE.get(activity).getSystemUiProxy();
             if (sysUiProxy == null) {
                 return null;
             }
diff --git a/quickstep/src/com/android/quickstep/TaskUtils.java b/quickstep/src/com/android/quickstep/TaskUtils.java
index f9b5e30..5cae2b9 100644
--- a/quickstep/src/com/android/quickstep/TaskUtils.java
+++ b/quickstep/src/com/android/quickstep/TaskUtils.java
@@ -18,8 +18,6 @@
 
 import static com.android.launcher3.anim.Interpolators.LINEAR;
 import static com.android.launcher3.anim.Interpolators.TOUCH_RESPONSE_INTERPOLATOR;
-import static com.android.systemui.shared.recents.utilities.Utilities.getNextFrameNumber;
-import static com.android.systemui.shared.recents.utilities.Utilities.getSurface;
 import static com.android.systemui.shared.system.RemoteAnimationTargetCompat.MODE_OPENING;
 
 import android.animation.ValueAnimator;
@@ -30,7 +28,6 @@
 import android.graphics.RectF;
 import android.os.UserHandle;
 import android.util.Log;
-import android.view.Surface;
 import android.view.View;
 
 import com.android.launcher3.BaseDraggingActivity;
@@ -92,10 +89,11 @@
      */
     public static TaskView findTaskViewToLaunch(
             BaseDraggingActivity activity, View v, RemoteAnimationTargetCompat[] targets) {
-        if (v instanceof TaskView) {
-            return (TaskView) v;
-        }
         RecentsView recentsView = activity.getOverviewPanel();
+        if (v instanceof TaskView) {
+            TaskView taskView = (TaskView) v;
+            return recentsView.isTaskViewVisible(taskView) ? taskView : null;
+        }
 
         // It's possible that the launched view can still be resolved to a visible task view, check
         // the task id of the opening task and see if we can find a match.
diff --git a/quickstep/src/com/android/quickstep/TouchInteractionService.java b/quickstep/src/com/android/quickstep/TouchInteractionService.java
index 5a1f523..bd79301 100644
--- a/quickstep/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/src/com/android/quickstep/TouchInteractionService.java
@@ -90,7 +90,14 @@
         public void onMotionEvent(MotionEvent ev) {
             mEventQueue.queue(ev);
 
-            String name = sMotionEventNames.get(ev.getActionMasked());
+            int action = ev.getActionMasked();
+            if (action == ACTION_DOWN) {
+                mOverviewInteractionState.setSwipeGestureInitializing(true);
+            } else if (action == ACTION_UP || action == ACTION_CANCEL) {
+                mOverviewInteractionState.setSwipeGestureInitializing(false);
+            }
+
+            String name = sMotionEventNames.get(action);
             if (name != null){
                 TraceHelper.partitionSection("SysUiBinder", name);
             }
@@ -106,6 +113,7 @@
         @Override
         public void onQuickScrubStart() {
             mEventQueue.onQuickScrubStart();
+            mOverviewInteractionState.setSwipeGestureInitializing(false);
             TraceHelper.partitionSection("SysUiBinder", "onQuickScrubStart");
         }
 
@@ -146,8 +154,8 @@
         @Override
         public void onQuickStep(MotionEvent motionEvent) {
             mEventQueue.onQuickStep(motionEvent);
+            mOverviewInteractionState.setSwipeGestureInitializing(false);
             TraceHelper.endSection("SysUiBinder", "onQuickStep");
-
         }
 
         @Override
@@ -179,13 +187,13 @@
     public void onCreate() {
         super.onCreate();
         mAM = ActivityManagerWrapper.getInstance();
-        mRecentsModel = RecentsModel.getInstance(this);
+        mRecentsModel = RecentsModel.INSTANCE.get(this);
         mRecentsModel.setPreloadTasksInBackground(true);
         mMainThreadExecutor = new MainThreadExecutor();
         mOverviewCommandHelper = new OverviewCommandHelper(this);
         mMainThreadChoreographer = Choreographer.getInstance();
         mEventQueue = new MotionEventQueue(mMainThreadChoreographer, TouchConsumer.NO_OP);
-        mOverviewInteractionState = OverviewInteractionState.getInstance(this);
+        mOverviewInteractionState = OverviewInteractionState.INSTANCE.get(this);
         mOverviewCallbacks = OverviewCallbacks.get(this);
         mTaskOverlayFactory = TaskOverlayFactory.get(this);
 
diff --git a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
index 95dcf48..f8ef49b 100644
--- a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
+++ b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
@@ -490,7 +490,7 @@
         // This method is only called when STATE_GESTURE_STARTED_QUICKSTEP/
         // STATE_GESTURE_STARTED_QUICKSCRUB is set, so we can enable the high-res thumbnail loader
         // here once we are sure that we will end up in an overview state
-        RecentsModel.getInstance(mContext).getRecentsTaskLoader()
+        RecentsModel.INSTANCE.get(mContext).getRecentsTaskLoader()
                 .getHighResThumbnailLoader().setVisible(true);
     }
 
@@ -641,10 +641,8 @@
                 overviewStackBounds = new Rect(0, 0, dp.widthPx, dp.heightPx);
             }
             // If we are not in multi-window mode, home insets should be same as system insets.
-            Rect insets = new Rect();
-            WindowManagerWrapper.getInstance().getStableInsets(insets);
             dp = dp.copy(mContext);
-            dp.updateInsets(insets);
+            dp.updateInsets(homeContentInsets);
         }
         dp.updateIsSeascape(mContext.getSystemService(WindowManager.class));
 
@@ -949,7 +947,7 @@
         mRecentsView.animateUpRunningTaskIconScale();
         mRecentsView.setSwipeDownShouldLaunchApp(true);
 
-        RecentsModel.getInstance(mContext).onOverviewShown(false, TAG);
+        RecentsModel.INSTANCE.get(mContext).onOverviewShown(false, TAG);
 
         doLogGesture(true /* toLauncher */);
         reset();
@@ -979,7 +977,7 @@
         mQuickScrubController.onFinishedTransitionToQuickScrub();
 
         mRecentsView.animateUpRunningTaskIconScale();
-        RecentsModel.getInstance(mContext).onOverviewShown(false, TAG);
+        RecentsModel.INSTANCE.get(mContext).onOverviewShown(false, TAG);
     }
 
     public void onQuickScrubProgress(float progress) {
@@ -1113,7 +1111,7 @@
     }
 
     private void preloadAssistData() {
-        RecentsModel.getInstance(mContext).preloadAssistData(mRunningTaskId, mAssistData);
+        RecentsModel.INSTANCE.get(mContext).preloadAssistData(mRunningTaskId, mAssistData);
     }
 
     public static float getHiddenTargetAlpha(RemoteAnimationTargetCompat app, Float expectedAlpha) {
diff --git a/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java b/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java
index df70a8a..0597a2e 100644
--- a/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java
+++ b/quickstep/src/com/android/quickstep/util/ClipAnimationHelper.java
@@ -30,7 +30,6 @@
 import android.os.Build;
 import android.os.RemoteException;
 import android.support.annotation.Nullable;
-import android.view.Surface;
 import android.view.animation.Interpolator;
 
 import com.android.launcher3.BaseDraggingActivity;
@@ -50,7 +49,6 @@
 import com.android.systemui.shared.system.TransactionCompat;
 import com.android.systemui.shared.system.WindowManagerWrapper;
 
-import java.util.function.BiConsumer;
 import java.util.function.BiFunction;
 
 /**
@@ -260,7 +258,7 @@
     }
 
     private void updateStackBoundsToMultiWindowTaskSize(BaseDraggingActivity activity) {
-        ISystemUiProxy sysUiProxy = RecentsModel.getInstance(activity).getSystemUiProxy();
+        ISystemUiProxy sysUiProxy = RecentsModel.INSTANCE.get(activity).getSystemUiProxy();
         if (sysUiProxy != null) {
             try {
                 mSourceStackBounds.set(sysUiProxy.getNonMinimizedSplitScreenSecondaryBounds());
diff --git a/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java b/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
index 7c5828b..697bb4f 100644
--- a/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/LauncherRecentsView.java
@@ -124,7 +124,7 @@
             ClipAnimationHelper helper) {
         AnimatorSet anim = super.createAdjacentPageAnimForTaskLaunch(tv, helper);
 
-        if (!OverviewInteractionState.getInstance(mActivity).isSwipeUpGestureEnabled()) {
+        if (!OverviewInteractionState.INSTANCE.get(mActivity).isSwipeUpGestureEnabled()) {
             // Hotseat doesn't move when opening recents with the button,
             // so don't animate it here either.
             return anim;
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index 72ab261..814d02d 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -277,7 +277,7 @@
                 .getDimensionPixelSize(R.dimen.recents_fast_fling_velocity);
         mActivity = (T) BaseActivity.fromContext(context);
         mQuickScrubController = new QuickScrubController(mActivity, this);
-        mModel = RecentsModel.getInstance(context);
+        mModel = RecentsModel.INSTANCE.get(context);
 
         mClearAllButton = (ClearAllButton) LayoutInflater.from(context)
                 .inflate(R.layout.overview_clear_all_button, this, false);
@@ -415,7 +415,7 @@
             case MotionEvent.ACTION_DOWN:
                 // Touch down anywhere but the deadzone around the visible clear all button and
                 // between the task views will start home on touch up
-                if (mTouchState == TOUCH_STATE_REST) {
+                if (!isHandlingTouch()) {
                     updateDeadZoneRects();
                     final boolean clearAllButtonDeadZoneConsumed = mClearAllButton.getAlpha() == 1
                             && mClearAllButtonDeadZoneRect.contains(x, y);
@@ -560,7 +560,7 @@
         boolean scrolling = super.computeScrollHelper();
         boolean isFlingingFast = false;
         updateCurveProperties();
-        if (scrolling || (mTouchState == TOUCH_STATE_SCROLLING)) {
+        if (scrolling || isHandlingTouch()) {
             if (scrolling) {
                 // Check if we are flinging quickly to disable high res thumbnail loading
                 isFlingingFast = mScroller.getCurrVelocity() > mFastFlingVelocity;
@@ -714,12 +714,16 @@
         setCurrentTask(runningTaskId);
     }
 
+    public TaskView getRunningTaskView() {
+        return getTaskView(mRunningTaskId);
+    }
+
     /**
      * Hides the tile associated with {@link #mRunningTaskId}
      */
     public void setRunningTaskHidden(boolean isHidden) {
         mRunningTaskTileHidden = isHidden;
-        TaskView runningTask = getTaskView(mRunningTaskId);
+        TaskView runningTask = getRunningTaskView();
         if (runningTask != null) {
             runningTask.setAlpha(isHidden ? 0 : mContentAlpha);
         }
@@ -745,7 +749,7 @@
     }
 
     public void showNextTask() {
-        TaskView runningTaskView = getTaskView(mRunningTaskId);
+        TaskView runningTaskView = getRunningTaskView();
         if (runningTaskView == null) {
             // Launch the first task
             if (getTaskViewCount() > 0) {
@@ -773,7 +777,7 @@
     }
 
     private void applyRunningTaskIconScale() {
-        TaskView firstTask = getTaskView(mRunningTaskId);
+        TaskView firstTask = getRunningTaskView();
         if (firstTask != null) {
             firstTask.setIconScaleAndDim(mRunningTaskIconScaledDown ? 0 : 1);
         }
@@ -781,7 +785,7 @@
 
     public void animateUpRunningTaskIconScale() {
         mRunningTaskIconScaledDown = false;
-        TaskView firstTask = getTaskView(mRunningTaskId);
+        TaskView firstTask = getRunningTaskView();
         if (firstTask != null) {
             firstTask.animateIconScaleAndDimIntoView();
         }
diff --git a/src/com/android/launcher3/AbstractFloatingView.java b/src/com/android/launcher3/AbstractFloatingView.java
index 3223837..e58e73d 100644
--- a/src/com/android/launcher3/AbstractFloatingView.java
+++ b/src/com/android/launcher3/AbstractFloatingView.java
@@ -69,9 +69,9 @@
     public static final int TYPE_DISCOVERY_BOUNCE = 1 << 6;
 
     // Popups related to quickstep UI
-    public static final int TYPE_QUICKSTEP_PREVIEW = 1 << 6;
-    public static final int TYPE_TASK_MENU = 1 << 7;
-    public static final int TYPE_OPTIONS_POPUP = 1 << 8;
+    public static final int TYPE_QUICKSTEP_PREVIEW = 1 << 7;
+    public static final int TYPE_TASK_MENU = 1 << 8;
+    public static final int TYPE_OPTIONS_POPUP = 1 << 9;
 
     public static final int TYPE_ALL = TYPE_FOLDER | TYPE_ACTION_POPUP
             | TYPE_WIDGETS_BOTTOM_SHEET | TYPE_WIDGET_RESIZE_FRAME | TYPE_WIDGETS_FULL_SHEET
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 44d3d53..a545122 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -40,7 +40,6 @@
 import android.content.BroadcastReceiver;
 import android.content.ComponentCallbacks2;
 import android.content.Context;
-import android.content.ContextWrapper;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.IntentSender;
@@ -1247,7 +1246,7 @@
                     mAppsView.reset(isStarted() /* animate */);
                 }
 
-                if (shouldMoveToDefaultScreen && !mWorkspace.isTouchActive()) {
+                if (shouldMoveToDefaultScreen && !mWorkspace.isHandlingTouch()) {
                     mWorkspace.post(mWorkspace::moveToDefaultScreen);
                 }
             }
@@ -1606,14 +1605,8 @@
         AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(this);
         if (topView != null && topView.onBackPressed()) {
             // Handled by the floating view.
-        } else if (!isInState(NORMAL)) {
-            LauncherState lastState = mStateManager.getLastState();
-            ued.logActionCommand(Action.Command.BACK, mStateManager.getState().containerType,
-                    lastState.containerType);
-            mStateManager.goToState(lastState);
         } else {
-            // Back button is a no-op here, but give at least some feedback for the button press
-            mWorkspace.showOutlinesTemporarily();
+            mStateManager.getState().onBackPressed(this);
         }
     }
 
diff --git a/src/com/android/launcher3/LauncherState.java b/src/com/android/launcher3/LauncherState.java
index 8a15b24..bbe44c0 100644
--- a/src/com/android/launcher3/LauncherState.java
+++ b/src/com/android/launcher3/LauncherState.java
@@ -30,6 +30,7 @@
 import com.android.launcher3.uioverrides.FastOverviewState;
 import com.android.launcher3.uioverrides.OverviewState;
 import com.android.launcher3.uioverrides.UiFactory;
+import com.android.launcher3.userevent.nano.LauncherLogProto.Action;
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 
 import java.util.Arrays;
@@ -251,6 +252,16 @@
         }
     }
 
+    public void onBackPressed(Launcher launcher) {
+        if (this != NORMAL) {
+            LauncherStateManager lsm = launcher.getStateManager();
+            LauncherState lastState = lsm.getLastState();
+            launcher.getUserEventDispatcher().logActionCommand(Action.Command.BACK,
+                    containerType, lastState.containerType);
+            lsm.goToState(lastState);
+        }
+    }
+
     protected static void dispatchWindowStateChanged(Launcher launcher) {
         launcher.getWindow().getDecorView().sendAccessibilityEvent(TYPE_WINDOW_STATE_CHANGED);
     }
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index db5dc66..c81f679 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -63,7 +63,6 @@
     protected static final ComputePageScrollsLogic SIMPLE_SCROLL_LOGIC = (v) -> v.getVisibility() != GONE;
 
     public static final int PAGE_SNAP_ANIMATION_DURATION = 750;
-    public static final int SLOW_PAGE_SNAP_ANIMATION_DURATION = 950;
 
     // OverScroll constants
     private final static int OVERSCROLL_PAGE_SNAP_ANIMATION_DURATION = 270;
@@ -109,13 +108,7 @@
     private float mTotalMotionX;
 
     protected int[] mPageScrolls;
-
-    protected final static int TOUCH_STATE_REST = 0;
-    protected final static int TOUCH_STATE_SCROLLING = 1;
-    protected final static int TOUCH_STATE_PREV_PAGE = 2;
-    protected final static int TOUCH_STATE_NEXT_PAGE = 3;
-
-    protected int mTouchState = TOUCH_STATE_REST;
+    private boolean mIsBeingDragged;
 
     protected int mTouchSlop;
     private int mMaximumVelocity;
@@ -451,7 +444,7 @@
 
             // We don't want to trigger a page end moving unless the page has settled
             // and the user has stopped scrolling
-            if (mTouchState == TOUCH_STATE_REST) {
+            if (!mIsBeingDragged) {
                 pageEndTransition();
             }
 
@@ -812,9 +805,9 @@
     }
 
     /** Returns whether x and y originated within the buffered viewport */
-    private boolean isTouchPointInViewportWithBuffer(int x, int y) {
+    private boolean isTouchPointInViewportWithBuffer(float x, float y) {
         sTmpRect.set(-getMeasuredWidth() / 2, 0, 3 * getMeasuredWidth() / 2, getMeasuredHeight());
-        return sTmpRect.contains(x, y);
+        return sTmpRect.contains((int) x, (int) y);
     }
 
     @Override
@@ -835,8 +828,7 @@
          * motion.
          */
         final int action = ev.getAction();
-        if ((action == MotionEvent.ACTION_MOVE) &&
-                (mTouchState == TOUCH_STATE_SCROLLING)) {
+        if ((action == MotionEvent.ACTION_MOVE) && mIsBeingDragged) {
             return true;
         }
 
@@ -877,17 +869,13 @@
                 final boolean finishedScrolling = (mScroller.isFinished() || xDist < mTouchSlop / 3);
 
                 if (finishedScrolling) {
-                    mTouchState = TOUCH_STATE_REST;
+                    mIsBeingDragged = false;
                     if (!mScroller.isFinished() && !mFreeScroll) {
                         setCurrentPage(getNextPage());
                         pageEndTransition();
                     }
                 } else {
-                    if (isTouchPointInViewportWithBuffer((int) mDownMotionX, (int) mDownMotionY)) {
-                        mTouchState = TOUCH_STATE_SCROLLING;
-                    } else {
-                        mTouchState = TOUCH_STATE_REST;
-                    }
+                    mIsBeingDragged = isTouchPointInViewportWithBuffer(mDownMotionX, mDownMotionY);
                 }
 
                 break;
@@ -908,11 +896,11 @@
          * The only time we want to intercept motion events is if we are in the
          * drag mode.
          */
-        return mTouchState != TOUCH_STATE_REST;
+        return mIsBeingDragged;
     }
 
     public boolean isHandlingTouch() {
-        return mTouchState != TOUCH_STATE_REST;
+        return mIsBeingDragged;
     }
 
     protected void determineScrollingStart(MotionEvent ev) {
@@ -931,7 +919,7 @@
         // Disallow scrolling if we started the gesture from outside the viewport
         final float x = ev.getX(pointerIndex);
         final float y = ev.getY(pointerIndex);
-        if (!isTouchPointInViewportWithBuffer((int) x, (int) y)) return;
+        if (!isTouchPointInViewportWithBuffer(x, y)) return;
 
         final int xDiff = (int) Math.abs(x - mLastMotionX);
 
@@ -940,7 +928,7 @@
 
         if (xMoved) {
             // Scroll if the user moved far enough along the X axis
-            mTouchState = TOUCH_STATE_SCROLLING;
+            mIsBeingDragged = true;
             mTotalMotionX += Math.abs(mLastMotionX - x);
             mLastMotionX = x;
             mLastMotionXRemainder = 0;
@@ -1077,14 +1065,14 @@
             mTotalMotionX = 0;
             mActivePointerId = ev.getPointerId(0);
 
-            if (mTouchState == TOUCH_STATE_SCROLLING) {
+            if (mIsBeingDragged) {
                 onScrollInteractionBegin();
                 pageBeginTransition();
             }
             break;
 
         case MotionEvent.ACTION_MOVE:
-            if (mTouchState == TOUCH_STATE_SCROLLING) {
+            if (mIsBeingDragged) {
                 // Scroll to follow the motion event
                 final int pointerIndex = ev.findPointerIndex(mActivePointerId);
 
@@ -1111,7 +1099,7 @@
             break;
 
         case MotionEvent.ACTION_UP:
-            if (mTouchState == TOUCH_STATE_SCROLLING) {
+            if (mIsBeingDragged) {
                 final int activePointerId = mActivePointerId;
                 final int pointerIndex = ev.findPointerIndex(activePointerId);
                 final float x = ev.getX(pointerIndex);
@@ -1193,26 +1181,6 @@
                     invalidate();
                 }
                 onScrollInteractionEnd();
-            } else if (mTouchState == TOUCH_STATE_PREV_PAGE) {
-                // at this point we have not moved beyond the touch slop
-                // (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
-                // we can just page
-                int nextPage = Math.max(0, mCurrentPage - 1);
-                if (nextPage != mCurrentPage) {
-                    snapToPage(nextPage);
-                } else {
-                    snapToDestination();
-                }
-            } else if (mTouchState == TOUCH_STATE_NEXT_PAGE) {
-                // at this point we have not moved beyond the touch slop
-                // (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
-                // we can just page
-                int nextPage = Math.min(getChildCount() - 1, mCurrentPage + 1);
-                if (nextPage != mCurrentPage) {
-                    snapToPage(nextPage);
-                } else {
-                    snapToDestination();
-                }
             }
 
             // End any intermediate reordering states
@@ -1220,7 +1188,7 @@
             break;
 
         case MotionEvent.ACTION_CANCEL:
-            if (mTouchState == TOUCH_STATE_SCROLLING) {
+            if (mIsBeingDragged) {
                 snapToDestination();
                 onScrollInteractionEnd();
             }
@@ -1242,7 +1210,7 @@
 
     private void resetTouchState() {
         releaseVelocityTracker();
-        mTouchState = TOUCH_STATE_REST;
+        mIsBeingDragged = false;
         mActivePointerId = INVALID_POINTER;
     }
 
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index 5cca2fb..28783fa 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -474,10 +474,6 @@
         super.onViewAdded(child);
     }
 
-    public boolean isTouchActive() {
-        return mTouchState != TOUCH_STATE_REST;
-    }
-
     /**
      * Initializes and binds the first page
      * @param qsb an existing qsb to recycle or null.
@@ -1291,12 +1287,6 @@
         }
     }
 
-    public void showOutlinesTemporarily() {
-        if (!mIsPageInTransition && !isTouchActive()) {
-            snapToPage(mCurrentPage);
-        }
-    }
-
     private void updatePageAlphaValues() {
         // We need to check the isDragging case because updatePageAlphaValues is called between
         // goToState(SPRING_LOADED) and onStartStateTransition.
diff --git a/src/com/android/launcher3/compat/AccessibilityManagerCompat.java b/src/com/android/launcher3/compat/AccessibilityManagerCompat.java
index 32fb533..3b0226e 100644
--- a/src/com/android/launcher3/compat/AccessibilityManagerCompat.java
+++ b/src/com/android/launcher3/compat/AccessibilityManagerCompat.java
@@ -16,7 +16,6 @@
 
 package com.android.launcher3.compat;
 
-import android.accessibilityservice.AccessibilityServiceInfo;
 import android.content.Context;
 import android.os.Bundle;
 import android.view.View;
@@ -78,14 +77,8 @@
         // If not running in a test harness, don't participate in test exchanges.
         if (!Utilities.IS_RUNNING_IN_TEST_HARNESS) return null;
 
-        // Additional safety check: when running under UI Automation, accessibility is enabled,
-        // but the list of accessibility services is empty. Return null if this is not the case.
         final AccessibilityManager accessibilityManager = getManager(context);
-        if (!accessibilityManager.isEnabled() ||
-                accessibilityManager.getEnabledAccessibilityServiceList(
-                        AccessibilityServiceInfo.FEEDBACK_ALL_MASK).size() > 0) {
-            return null;
-        }
+        if (!accessibilityManager.isEnabled()) return null;
 
         return accessibilityManager;
     }
diff --git a/src/com/android/launcher3/touch/ItemClickHandler.java b/src/com/android/launcher3/touch/ItemClickHandler.java
index 97f836f..52fef9f 100644
--- a/src/com/android/launcher3/touch/ItemClickHandler.java
+++ b/src/com/android/launcher3/touch/ItemClickHandler.java
@@ -218,7 +218,7 @@
         if (item instanceof ShortcutInfo) {
             ShortcutInfo si = (ShortcutInfo) item;
             if (si.hasStatusFlag(ShortcutInfo.FLAG_SUPPORTS_WEB_UI)
-                    && intent.getAction() == Intent.ACTION_VIEW) {
+                    && Intent.ACTION_VIEW.equals(intent.getAction())) {
                 // make a copy of the intent that has the package set to null
                 // we do this because the platform sometimes disables instant
                 // apps temporarily (triggered by the user) and fallbacks to the
diff --git a/src/com/android/launcher3/touch/WorkspaceTouchListener.java b/src/com/android/launcher3/touch/WorkspaceTouchListener.java
index f59f14e..6688927 100644
--- a/src/com/android/launcher3/touch/WorkspaceTouchListener.java
+++ b/src/com/android/launcher3/touch/WorkspaceTouchListener.java
@@ -125,7 +125,7 @@
         }
 
         if (action == ACTION_UP || action == ACTION_POINTER_UP) {
-            if (!mWorkspace.isTouchActive()) {
+            if (!mWorkspace.isHandlingTouch()) {
                 final CellLayout currentPage =
                         (CellLayout) mWorkspace.getChildAt(mWorkspace.getCurrentPage());
                 if (currentPage != null) {
diff --git a/src/com/android/launcher3/util/OverScroller.java b/src/com/android/launcher3/util/OverScroller.java
new file mode 100644
index 0000000..ec9abce
--- /dev/null
+++ b/src/com/android/launcher3/util/OverScroller.java
@@ -0,0 +1,963 @@
+/*
+ * Copyright (C) 2010 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.util;
+
+import static com.android.launcher3.anim.Interpolators.SCROLL;
+
+import android.content.Context;
+import android.hardware.SensorManager;
+import android.util.Log;
+import android.view.ViewConfiguration;
+import android.view.animation.AnimationUtils;
+import android.view.animation.Interpolator;
+
+/**
+ * This class encapsulates scrolling with the ability to overshoot the bounds
+ * of a scrolling operation. This class is a drop-in replacement for
+ * {@link android.widget.Scroller} in most cases.
+ */
+public class OverScroller {
+    private int mMode;
+
+    private final SplineOverScroller mScrollerX;
+    private final SplineOverScroller mScrollerY;
+
+    private Interpolator mInterpolator;
+
+    private final boolean mFlywheel;
+
+    private static final int DEFAULT_DURATION = 250;
+    private static final int SCROLL_MODE = 0;
+    private static final int FLING_MODE = 1;
+
+    /**
+     * Creates an OverScroller with a viscous fluid scroll interpolator and flywheel.
+     * @param context
+     */
+    public OverScroller(Context context) {
+        this(context, null);
+    }
+
+    /**
+     * Creates an OverScroller with flywheel enabled.
+     * @param context The context of this application.
+     * @param interpolator The scroll interpolator. If null, a default (viscous) interpolator will
+     * be used.
+     */
+    public OverScroller(Context context, Interpolator interpolator) {
+        this(context, interpolator, true);
+    }
+
+    /**
+     * Creates an OverScroller.
+     * @param context The context of this application.
+     * @param interpolator The scroll interpolator. If null, a default (viscous) interpolator will
+     * be used.
+     * @param flywheel If true, successive fling motions will keep on increasing scroll speed.
+     * @hide
+     */
+    public OverScroller(Context context, Interpolator interpolator, boolean flywheel) {
+        if (interpolator == null) {
+            mInterpolator = SCROLL;
+        } else {
+            mInterpolator = interpolator;
+        }
+        mFlywheel = flywheel;
+        mScrollerX = new SplineOverScroller(context);
+        mScrollerY = new SplineOverScroller(context);
+    }
+
+    /**
+     * Creates an OverScroller with flywheel enabled.
+     * @param context The context of this application.
+     * @param interpolator The scroll interpolator. If null, a default (viscous) interpolator will
+     * be used.
+     * @param bounceCoefficientX A value between 0 and 1 that will determine the proportion of the
+     * velocity which is preserved in the bounce when the horizontal edge is reached. A null value
+     * means no bounce. This behavior is no longer supported and this coefficient has no effect.
+     * @param bounceCoefficientY Same as bounceCoefficientX but for the vertical direction. This
+     * behavior is no longer supported and this coefficient has no effect.
+     * @deprecated Use {@link #OverScroller(Context, Interpolator)} instead.
+     */
+    @Deprecated
+    public OverScroller(Context context, Interpolator interpolator,
+            float bounceCoefficientX, float bounceCoefficientY) {
+        this(context, interpolator, true);
+    }
+
+    /**
+     * Creates an OverScroller.
+     * @param context The context of this application.
+     * @param interpolator The scroll interpolator. If null, a default (viscous) interpolator will
+     * be used.
+     * @param bounceCoefficientX A value between 0 and 1 that will determine the proportion of the
+     * velocity which is preserved in the bounce when the horizontal edge is reached. A null value
+     * means no bounce. This behavior is no longer supported and this coefficient has no effect.
+     * @param bounceCoefficientY Same as bounceCoefficientX but for the vertical direction. This
+     * behavior is no longer supported and this coefficient has no effect.
+     * @param flywheel If true, successive fling motions will keep on increasing scroll speed.
+     * @deprecated Use {@link #OverScroller(Context, Interpolator)} instead.
+     */
+    @Deprecated
+    public OverScroller(Context context, Interpolator interpolator,
+            float bounceCoefficientX, float bounceCoefficientY, boolean flywheel) {
+        this(context, interpolator, flywheel);
+    }
+
+    void setInterpolator(Interpolator interpolator) {
+        if (interpolator == null) {
+            mInterpolator = SCROLL;
+        } else {
+            mInterpolator = interpolator;
+        }
+    }
+
+    /**
+     * The amount of friction applied to flings. The default value
+     * is {@link ViewConfiguration#getScrollFriction}.
+     *
+     * @param friction A scalar dimension-less value representing the coefficient of
+     *         friction.
+     */
+    public final void setFriction(float friction) {
+        mScrollerX.setFriction(friction);
+        mScrollerY.setFriction(friction);
+    }
+
+    /**
+     *
+     * Returns whether the scroller has finished scrolling.
+     *
+     * @return True if the scroller has finished scrolling, false otherwise.
+     */
+    public final boolean isFinished() {
+        return mScrollerX.mFinished && mScrollerY.mFinished;
+    }
+
+    /**
+     * Force the finished field to a particular value. Contrary to
+     * {@link #abortAnimation()}, forcing the animation to finished
+     * does NOT cause the scroller to move to the final x and y
+     * position.
+     *
+     * @param finished The new finished value.
+     */
+    public final void forceFinished(boolean finished) {
+        mScrollerX.mFinished = mScrollerY.mFinished = finished;
+    }
+
+    /**
+     * Returns the current X offset in the scroll.
+     *
+     * @return The new X offset as an absolute distance from the origin.
+     */
+    public final int getCurrX() {
+        return mScrollerX.mCurrentPosition;
+    }
+
+    /**
+     * Returns the current Y offset in the scroll.
+     *
+     * @return The new Y offset as an absolute distance from the origin.
+     */
+    public final int getCurrY() {
+        return mScrollerY.mCurrentPosition;
+    }
+
+    /**
+     * Returns the absolute value of the current velocity.
+     *
+     * @return The original velocity less the deceleration, norm of the X and Y velocity vector.
+     */
+    public float getCurrVelocity() {
+        return (float) Math.hypot(mScrollerX.mCurrVelocity, mScrollerY.mCurrVelocity);
+    }
+
+    /**
+     * Returns the start X offset in the scroll.
+     *
+     * @return The start X offset as an absolute distance from the origin.
+     */
+    public final int getStartX() {
+        return mScrollerX.mStart;
+    }
+
+    /**
+     * Returns the start Y offset in the scroll.
+     *
+     * @return The start Y offset as an absolute distance from the origin.
+     */
+    public final int getStartY() {
+        return mScrollerY.mStart;
+    }
+
+    /**
+     * Returns where the scroll will end. Valid only for "fling" scrolls.
+     *
+     * @return The final X offset as an absolute distance from the origin.
+     */
+    public final int getFinalX() {
+        return mScrollerX.mFinal;
+    }
+
+    /**
+     * Returns where the scroll will end. Valid only for "fling" scrolls.
+     *
+     * @return The final Y offset as an absolute distance from the origin.
+     */
+    public final int getFinalY() {
+        return mScrollerY.mFinal;
+    }
+
+    /**
+     * Returns how long the scroll event will take, in milliseconds.
+     *
+     * @return The duration of the scroll in milliseconds.
+     *
+     * @hide Pending removal once nothing depends on it
+     * @deprecated OverScrollers don't necessarily have a fixed duration.
+     *             This function will lie to the best of its ability.
+     */
+    @Deprecated
+    public final int getDuration() {
+        return Math.max(mScrollerX.mDuration, mScrollerY.mDuration);
+    }
+
+    /**
+     * Extend the scroll animation. This allows a running animation to scroll
+     * further and longer, when used with {@link #setFinalX(int)} or {@link #setFinalY(int)}.
+     *
+     * @param extend Additional time to scroll in milliseconds.
+     * @see #setFinalX(int)
+     * @see #setFinalY(int)
+     *
+     * @hide Pending removal once nothing depends on it
+     * @deprecated OverScrollers don't necessarily have a fixed duration.
+     *             Instead of setting a new final position and extending
+     *             the duration of an existing scroll, use startScroll
+     *             to begin a new animation.
+     */
+    @Deprecated
+    public void extendDuration(int extend) {
+        mScrollerX.extendDuration(extend);
+        mScrollerY.extendDuration(extend);
+    }
+
+    /**
+     * Sets the final position (X) for this scroller.
+     *
+     * @param newX The new X offset as an absolute distance from the origin.
+     * @see #extendDuration(int)
+     * @see #setFinalY(int)
+     *
+     * @hide Pending removal once nothing depends on it
+     * @deprecated OverScroller's final position may change during an animation.
+     *             Instead of setting a new final position and extending
+     *             the duration of an existing scroll, use startScroll
+     *             to begin a new animation.
+     */
+    @Deprecated
+    public void setFinalX(int newX) {
+        mScrollerX.setFinalPosition(newX);
+    }
+
+    /**
+     * Sets the final position (Y) for this scroller.
+     *
+     * @param newY The new Y offset as an absolute distance from the origin.
+     * @see #extendDuration(int)
+     * @see #setFinalX(int)
+     *
+     * @hide Pending removal once nothing depends on it
+     * @deprecated OverScroller's final position may change during an animation.
+     *             Instead of setting a new final position and extending
+     *             the duration of an existing scroll, use startScroll
+     *             to begin a new animation.
+     */
+    @Deprecated
+    public void setFinalY(int newY) {
+        mScrollerY.setFinalPosition(newY);
+    }
+
+    /**
+     * Call this when you want to know the new location. If it returns true, the
+     * animation is not yet finished.
+     */
+    public boolean computeScrollOffset() {
+        if (isFinished()) {
+            return false;
+        }
+
+        switch (mMode) {
+            case SCROLL_MODE:
+                long time = AnimationUtils.currentAnimationTimeMillis();
+                // Any scroller can be used for time, since they were started
+                // together in scroll mode. We use X here.
+                final long elapsedTime = time - mScrollerX.mStartTime;
+
+                final int duration = mScrollerX.mDuration;
+                if (elapsedTime < duration) {
+                    final float q = mInterpolator.getInterpolation(elapsedTime / (float) duration);
+                    mScrollerX.updateScroll(q);
+                    mScrollerY.updateScroll(q);
+                } else {
+                    abortAnimation();
+                }
+                break;
+
+            case FLING_MODE:
+                if (!mScrollerX.mFinished) {
+                    if (!mScrollerX.update()) {
+                        if (!mScrollerX.continueWhenFinished()) {
+                            mScrollerX.finish();
+                        }
+                    }
+                }
+
+                if (!mScrollerY.mFinished) {
+                    if (!mScrollerY.update()) {
+                        if (!mScrollerY.continueWhenFinished()) {
+                            mScrollerY.finish();
+                        }
+                    }
+                }
+
+                break;
+        }
+
+        return true;
+    }
+
+    /**
+     * Start scrolling by providing a starting point and the distance to travel.
+     * The scroll will use the default value of 250 milliseconds for the
+     * duration.
+     *
+     * @param startX Starting horizontal scroll offset in pixels. Positive
+     *        numbers will scroll the content to the left.
+     * @param startY Starting vertical scroll offset in pixels. Positive numbers
+     *        will scroll the content up.
+     * @param dx Horizontal distance to travel. Positive numbers will scroll the
+     *        content to the left.
+     * @param dy Vertical distance to travel. Positive numbers will scroll the
+     *        content up.
+     */
+    public void startScroll(int startX, int startY, int dx, int dy) {
+        startScroll(startX, startY, dx, dy, DEFAULT_DURATION);
+    }
+
+    /**
+     * Start scrolling by providing a starting point and the distance to travel.
+     *
+     * @param startX Starting horizontal scroll offset in pixels. Positive
+     *        numbers will scroll the content to the left.
+     * @param startY Starting vertical scroll offset in pixels. Positive numbers
+     *        will scroll the content up.
+     * @param dx Horizontal distance to travel. Positive numbers will scroll the
+     *        content to the left.
+     * @param dy Vertical distance to travel. Positive numbers will scroll the
+     *        content up.
+     * @param duration Duration of the scroll in milliseconds.
+     */
+    public void startScroll(int startX, int startY, int dx, int dy, int duration) {
+        mMode = SCROLL_MODE;
+        mScrollerX.startScroll(startX, dx, duration);
+        mScrollerY.startScroll(startY, dy, duration);
+    }
+
+    /**
+     * Call this when you want to 'spring back' into a valid coordinate range.
+     *
+     * @param startX Starting X coordinate
+     * @param startY Starting Y coordinate
+     * @param minX Minimum valid X value
+     * @param maxX Maximum valid X value
+     * @param minY Minimum valid Y value
+     * @param maxY Minimum valid Y value
+     * @return true if a springback was initiated, false if startX and startY were
+     *          already within the valid range.
+     */
+    public boolean springBack(int startX, int startY, int minX, int maxX, int minY, int maxY) {
+        mMode = FLING_MODE;
+
+        // Make sure both methods are called.
+        final boolean spingbackX = mScrollerX.springback(startX, minX, maxX);
+        final boolean spingbackY = mScrollerY.springback(startY, minY, maxY);
+        return spingbackX || spingbackY;
+    }
+
+    public void fling(int startX, int startY, int velocityX, int velocityY,
+            int minX, int maxX, int minY, int maxY) {
+        fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY, 0, 0);
+    }
+
+    /**
+     * Start scrolling based on a fling gesture. The distance traveled will
+     * depend on the initial velocity of the fling.
+     *
+     * @param startX Starting point of the scroll (X)
+     * @param startY Starting point of the scroll (Y)
+     * @param velocityX Initial velocity of the fling (X) measured in pixels per
+     *            second.
+     * @param velocityY Initial velocity of the fling (Y) measured in pixels per
+     *            second
+     * @param minX Minimum X value. The scroller will not scroll past this point
+     *            unless overX > 0. If overfling is allowed, it will use minX as
+     *            a springback boundary.
+     * @param maxX Maximum X value. The scroller will not scroll past this point
+     *            unless overX > 0. If overfling is allowed, it will use maxX as
+     *            a springback boundary.
+     * @param minY Minimum Y value. The scroller will not scroll past this point
+     *            unless overY > 0. If overfling is allowed, it will use minY as
+     *            a springback boundary.
+     * @param maxY Maximum Y value. The scroller will not scroll past this point
+     *            unless overY > 0. If overfling is allowed, it will use maxY as
+     *            a springback boundary.
+     * @param overX Overfling range. If > 0, horizontal overfling in either
+     *            direction will be possible.
+     * @param overY Overfling range. If > 0, vertical overfling in either
+     *            direction will be possible.
+     */
+    public void fling(int startX, int startY, int velocityX, int velocityY,
+            int minX, int maxX, int minY, int maxY, int overX, int overY) {
+        // Continue a scroll or fling in progress
+        if (mFlywheel && !isFinished()) {
+            float oldVelocityX = mScrollerX.mCurrVelocity;
+            float oldVelocityY = mScrollerY.mCurrVelocity;
+            if (Math.signum(velocityX) == Math.signum(oldVelocityX) &&
+                    Math.signum(velocityY) == Math.signum(oldVelocityY)) {
+                velocityX += oldVelocityX;
+                velocityY += oldVelocityY;
+            }
+        }
+
+        mMode = FLING_MODE;
+        mScrollerX.fling(startX, velocityX, minX, maxX, overX);
+        mScrollerY.fling(startY, velocityY, minY, maxY, overY);
+    }
+
+    /**
+     * Notify the scroller that we've reached a horizontal boundary.
+     * Normally the information to handle this will already be known
+     * when the animation is started, such as in a call to one of the
+     * fling functions. However there are cases where this cannot be known
+     * in advance. This function will transition the current motion and
+     * animate from startX to finalX as appropriate.
+     *
+     * @param startX Starting/current X position
+     * @param finalX Desired final X position
+     * @param overX Magnitude of overscroll allowed. This should be the maximum
+     *              desired distance from finalX. Absolute value - must be positive.
+     */
+    public void notifyHorizontalEdgeReached(int startX, int finalX, int overX) {
+        mScrollerX.notifyEdgeReached(startX, finalX, overX);
+    }
+
+    /**
+     * Notify the scroller that we've reached a vertical boundary.
+     * Normally the information to handle this will already be known
+     * when the animation is started, such as in a call to one of the
+     * fling functions. However there are cases where this cannot be known
+     * in advance. This function will animate a parabolic motion from
+     * startY to finalY.
+     *
+     * @param startY Starting/current Y position
+     * @param finalY Desired final Y position
+     * @param overY Magnitude of overscroll allowed. This should be the maximum
+     *              desired distance from finalY. Absolute value - must be positive.
+     */
+    public void notifyVerticalEdgeReached(int startY, int finalY, int overY) {
+        mScrollerY.notifyEdgeReached(startY, finalY, overY);
+    }
+
+    /**
+     * Returns whether the current Scroller is currently returning to a valid position.
+     * Valid bounds were provided by the
+     * {@link #fling(int, int, int, int, int, int, int, int, int, int)} method.
+     *
+     * One should check this value before calling
+     * {@link #startScroll(int, int, int, int)} as the interpolation currently in progress
+     * to restore a valid position will then be stopped. The caller has to take into account
+     * the fact that the started scroll will start from an overscrolled position.
+     *
+     * @return true when the current position is overscrolled and in the process of
+     *         interpolating back to a valid value.
+     */
+    public boolean isOverScrolled() {
+        return ((!mScrollerX.mFinished &&
+                mScrollerX.mState != SplineOverScroller.SPLINE) ||
+                (!mScrollerY.mFinished &&
+                        mScrollerY.mState != SplineOverScroller.SPLINE));
+    }
+
+    /**
+     * Stops the animation. Contrary to {@link #forceFinished(boolean)},
+     * aborting the animating causes the scroller to move to the final x and y
+     * positions.
+     *
+     * @see #forceFinished(boolean)
+     */
+    public void abortAnimation() {
+        mScrollerX.finish();
+        mScrollerY.finish();
+    }
+
+    /**
+     * Returns the time elapsed since the beginning of the scrolling.
+     *
+     * @return The elapsed time in milliseconds.
+     *
+     * @hide
+     */
+    public int timePassed() {
+        final long time = AnimationUtils.currentAnimationTimeMillis();
+        final long startTime = Math.min(mScrollerX.mStartTime, mScrollerY.mStartTime);
+        return (int) (time - startTime);
+    }
+
+    /**
+     * @hide
+     */
+    public boolean isScrollingInDirection(float xvel, float yvel) {
+        final int dx = mScrollerX.mFinal - mScrollerX.mStart;
+        final int dy = mScrollerY.mFinal - mScrollerY.mStart;
+        return !isFinished() && Math.signum(xvel) == Math.signum(dx) &&
+                Math.signum(yvel) == Math.signum(dy);
+    }
+
+    static class SplineOverScroller {
+        // Initial position
+        private int mStart;
+
+        // Current position
+        private int mCurrentPosition;
+
+        // Final position
+        private int mFinal;
+
+        // Initial velocity
+        private int mVelocity;
+
+        // Current velocity
+        private float mCurrVelocity;
+
+        // Constant current deceleration
+        private float mDeceleration;
+
+        // Animation starting time, in system milliseconds
+        private long mStartTime;
+
+        // Animation duration, in milliseconds
+        private int mDuration;
+
+        // Duration to complete spline component of animation
+        private int mSplineDuration;
+
+        // Distance to travel along spline animation
+        private int mSplineDistance;
+
+        // Whether the animation is currently in progress
+        private boolean mFinished;
+
+        // The allowed overshot distance before boundary is reached.
+        private int mOver;
+
+        // Fling friction
+        private float mFlingFriction = ViewConfiguration.getScrollFriction();
+
+        // Current state of the animation.
+        private int mState = SPLINE;
+
+        // Constant gravity value, used in the deceleration phase.
+        private static final float GRAVITY = 2000.0f;
+
+        // A context-specific coefficient adjusted to physical values.
+        private float mPhysicalCoeff;
+
+        private static float DECELERATION_RATE = (float) (Math.log(0.78) / Math.log(0.9));
+        private static final float INFLEXION = 0.35f; // Tension lines cross at (INFLEXION, 1)
+        private static final float START_TENSION = 0.5f;
+        private static final float END_TENSION = 1.0f;
+        private static final float P1 = START_TENSION * INFLEXION;
+        private static final float P2 = 1.0f - END_TENSION * (1.0f - INFLEXION);
+
+        private static final int NB_SAMPLES = 100;
+        private static final float[] SPLINE_POSITION = new float[NB_SAMPLES + 1];
+        private static final float[] SPLINE_TIME = new float[NB_SAMPLES + 1];
+
+        private static final int SPLINE = 0;
+        private static final int CUBIC = 1;
+        private static final int BALLISTIC = 2;
+
+        static {
+            float x_min = 0.0f;
+            float y_min = 0.0f;
+            for (int i = 0; i < NB_SAMPLES; i++) {
+                final float alpha = (float) i / NB_SAMPLES;
+
+                float x_max = 1.0f;
+                float x, tx, coef;
+                while (true) {
+                    x = x_min + (x_max - x_min) / 2.0f;
+                    coef = 3.0f * x * (1.0f - x);
+                    tx = coef * ((1.0f - x) * P1 + x * P2) + x * x * x;
+                    if (Math.abs(tx - alpha) < 1E-5) break;
+                    if (tx > alpha) x_max = x;
+                    else x_min = x;
+                }
+                SPLINE_POSITION[i] = coef * ((1.0f - x) * START_TENSION + x) + x * x * x;
+
+                float y_max = 1.0f;
+                float y, dy;
+                while (true) {
+                    y = y_min + (y_max - y_min) / 2.0f;
+                    coef = 3.0f * y * (1.0f - y);
+                    dy = coef * ((1.0f - y) * START_TENSION + y) + y * y * y;
+                    if (Math.abs(dy - alpha) < 1E-5) break;
+                    if (dy > alpha) y_max = y;
+                    else y_min = y;
+                }
+                SPLINE_TIME[i] = coef * ((1.0f - y) * P1 + y * P2) + y * y * y;
+            }
+            SPLINE_POSITION[NB_SAMPLES] = SPLINE_TIME[NB_SAMPLES] = 1.0f;
+        }
+
+        void setFriction(float friction) {
+            mFlingFriction = friction;
+        }
+
+        SplineOverScroller(Context context) {
+            mFinished = true;
+            final float ppi = context.getResources().getDisplayMetrics().density * 160.0f;
+            mPhysicalCoeff = SensorManager.GRAVITY_EARTH // g (m/s^2)
+                    * 39.37f // inch/meter
+                    * ppi
+                    * 0.84f; // look and feel tuning
+        }
+
+        void updateScroll(float q) {
+            mCurrentPosition = mStart + Math.round(q * (mFinal - mStart));
+        }
+
+        /*
+         * Get a signed deceleration that will reduce the velocity.
+         */
+        static private float getDeceleration(int velocity) {
+            return velocity > 0 ? -GRAVITY : GRAVITY;
+        }
+
+        /*
+         * Modifies mDuration to the duration it takes to get from start to newFinal using the
+         * spline interpolation. The previous duration was needed to get to oldFinal.
+         */
+        private void adjustDuration(int start, int oldFinal, int newFinal) {
+            final int oldDistance = oldFinal - start;
+            final int newDistance = newFinal - start;
+            final float x = Math.abs((float) newDistance / oldDistance);
+            final int index = (int) (NB_SAMPLES * x);
+            if (index < NB_SAMPLES) {
+                final float x_inf = (float) index / NB_SAMPLES;
+                final float x_sup = (float) (index + 1) / NB_SAMPLES;
+                final float t_inf = SPLINE_TIME[index];
+                final float t_sup = SPLINE_TIME[index + 1];
+                final float timeCoef = t_inf + (x - x_inf) / (x_sup - x_inf) * (t_sup - t_inf);
+                mDuration *= timeCoef;
+            }
+        }
+
+        void startScroll(int start, int distance, int duration) {
+            mFinished = false;
+
+            mCurrentPosition = mStart = start;
+            mFinal = start + distance;
+
+            mStartTime = AnimationUtils.currentAnimationTimeMillis();
+            mDuration = duration;
+
+            // Unused
+            mDeceleration = 0.0f;
+            mVelocity = 0;
+        }
+
+        void finish() {
+            mCurrentPosition = mFinal;
+            // Not reset since WebView relies on this value for fast fling.
+            // TODO: restore when WebView uses the fast fling implemented in this class.
+            // mCurrVelocity = 0.0f;
+            mFinished = true;
+        }
+
+        void setFinalPosition(int position) {
+            mFinal = position;
+            mFinished = false;
+        }
+
+        void extendDuration(int extend) {
+            final long time = AnimationUtils.currentAnimationTimeMillis();
+            final int elapsedTime = (int) (time - mStartTime);
+            mDuration = elapsedTime + extend;
+            mFinished = false;
+        }
+
+        boolean springback(int start, int min, int max) {
+            mFinished = true;
+
+            mCurrentPosition = mStart = mFinal = start;
+            mVelocity = 0;
+
+            mStartTime = AnimationUtils.currentAnimationTimeMillis();
+            mDuration = 0;
+
+            if (start < min) {
+                startSpringback(start, min, 0);
+            } else if (start > max) {
+                startSpringback(start, max, 0);
+            }
+
+            return !mFinished;
+        }
+
+        private void startSpringback(int start, int end, int velocity) {
+            // mStartTime has been set
+            mFinished = false;
+            mState = CUBIC;
+            mCurrentPosition = mStart = start;
+            mFinal = end;
+            final int delta = start - end;
+            mDeceleration = getDeceleration(delta);
+            // TODO take velocity into account
+            mVelocity = -delta; // only sign is used
+            mOver = Math.abs(delta);
+            mDuration = (int) (1000.0 * Math.sqrt(-2.0 * delta / mDeceleration));
+        }
+
+        void fling(int start, int velocity, int min, int max, int over) {
+            mOver = over;
+            mFinished = false;
+            mCurrVelocity = mVelocity = velocity;
+            mDuration = mSplineDuration = 0;
+            mStartTime = AnimationUtils.currentAnimationTimeMillis();
+            mCurrentPosition = mStart = start;
+
+            if (start > max || start < min) {
+                startAfterEdge(start, min, max, velocity);
+                return;
+            }
+
+            mState = SPLINE;
+            double totalDistance = 0.0;
+
+            if (velocity != 0) {
+                mDuration = mSplineDuration = getSplineFlingDuration(velocity);
+                totalDistance = getSplineFlingDistance(velocity);
+            }
+
+            mSplineDistance = (int) (totalDistance * Math.signum(velocity));
+            mFinal = start + mSplineDistance;
+
+            // Clamp to a valid final position
+            if (mFinal < min) {
+                adjustDuration(mStart, mFinal, min);
+                mFinal = min;
+            }
+
+            if (mFinal > max) {
+                adjustDuration(mStart, mFinal, max);
+                mFinal = max;
+            }
+        }
+
+        private double getSplineDeceleration(int velocity) {
+            return Math.log(INFLEXION * Math.abs(velocity) / (mFlingFriction * mPhysicalCoeff));
+        }
+
+        private double getSplineFlingDistance(int velocity) {
+            final double l = getSplineDeceleration(velocity);
+            final double decelMinusOne = DECELERATION_RATE - 1.0;
+            return mFlingFriction * mPhysicalCoeff * Math.exp(DECELERATION_RATE / decelMinusOne * l);
+        }
+
+        /* Returns the duration, expressed in milliseconds */
+        private int getSplineFlingDuration(int velocity) {
+            final double l = getSplineDeceleration(velocity);
+            final double decelMinusOne = DECELERATION_RATE - 1.0;
+            return (int) (1000.0 * Math.exp(l / decelMinusOne));
+        }
+
+        private void fitOnBounceCurve(int start, int end, int velocity) {
+            // Simulate a bounce that started from edge
+            final float durationToApex = - velocity / mDeceleration;
+            // The float cast below is necessary to avoid integer overflow.
+            final float velocitySquared = (float) velocity * velocity;
+            final float distanceToApex = velocitySquared / 2.0f / Math.abs(mDeceleration);
+            final float distanceToEdge = Math.abs(end - start);
+            final float totalDuration = (float) Math.sqrt(
+                    2.0 * (distanceToApex + distanceToEdge) / Math.abs(mDeceleration));
+            mStartTime -= (int) (1000.0f * (totalDuration - durationToApex));
+            mCurrentPosition = mStart = end;
+            mVelocity = (int) (- mDeceleration * totalDuration);
+        }
+
+        private void startBounceAfterEdge(int start, int end, int velocity) {
+            mDeceleration = getDeceleration(velocity == 0 ? start - end : velocity);
+            fitOnBounceCurve(start, end, velocity);
+            onEdgeReached();
+        }
+
+        private void startAfterEdge(int start, int min, int max, int velocity) {
+            if (start > min && start < max) {
+                Log.e("OverScroller", "startAfterEdge called from a valid position");
+                mFinished = true;
+                return;
+            }
+            final boolean positive = start > max;
+            final int edge = positive ? max : min;
+            final int overDistance = start - edge;
+            boolean keepIncreasing = overDistance * velocity >= 0;
+            if (keepIncreasing) {
+                // Will result in a bounce or a to_boundary depending on velocity.
+                startBounceAfterEdge(start, edge, velocity);
+            } else {
+                final double totalDistance = getSplineFlingDistance(velocity);
+                if (totalDistance > Math.abs(overDistance)) {
+                    fling(start, velocity, positive ? min : start, positive ? start : max, mOver);
+                } else {
+                    startSpringback(start, edge, velocity);
+                }
+            }
+        }
+
+        void notifyEdgeReached(int start, int end, int over) {
+            // mState is used to detect successive notifications
+            if (mState == SPLINE) {
+                mOver = over;
+                mStartTime = AnimationUtils.currentAnimationTimeMillis();
+                // We were in fling/scroll mode before: current velocity is such that distance to
+                // edge is increasing. This ensures that startAfterEdge will not start a new fling.
+                startAfterEdge(start, end, end, (int) mCurrVelocity);
+            }
+        }
+
+        private void onEdgeReached() {
+            // mStart, mVelocity and mStartTime were adjusted to their values when edge was reached.
+            // The float cast below is necessary to avoid integer overflow.
+            final float velocitySquared = (float) mVelocity * mVelocity;
+            float distance = velocitySquared / (2.0f * Math.abs(mDeceleration));
+            final float sign = Math.signum(mVelocity);
+
+            if (distance > mOver) {
+                // Default deceleration is not sufficient to slow us down before boundary
+                mDeceleration = - sign * velocitySquared / (2.0f * mOver);
+                distance = mOver;
+            }
+
+            mOver = (int) distance;
+            mState = BALLISTIC;
+            mFinal = mStart + (int) (mVelocity > 0 ? distance : -distance);
+            mDuration = - (int) (1000.0f * mVelocity / mDeceleration);
+        }
+
+        boolean continueWhenFinished() {
+            switch (mState) {
+                case SPLINE:
+                    // Duration from start to null velocity
+                    if (mDuration < mSplineDuration) {
+                        // If the animation was clamped, we reached the edge
+                        mCurrentPosition = mStart = mFinal;
+                        // TODO Better compute speed when edge was reached
+                        mVelocity = (int) mCurrVelocity;
+                        mDeceleration = getDeceleration(mVelocity);
+                        mStartTime += mDuration;
+                        onEdgeReached();
+                    } else {
+                        // Normal stop, no need to continue
+                        return false;
+                    }
+                    break;
+                case BALLISTIC:
+                    mStartTime += mDuration;
+                    startSpringback(mFinal, mStart, 0);
+                    break;
+                case CUBIC:
+                    return false;
+            }
+
+            update();
+            return true;
+        }
+
+        /*
+         * Update the current position and velocity for current time. Returns
+         * true if update has been done and false if animation duration has been
+         * reached.
+         */
+        boolean update() {
+            final long time = AnimationUtils.currentAnimationTimeMillis();
+            final long currentTime = time - mStartTime;
+
+            if (currentTime == 0) {
+                // Skip work but report that we're still going if we have a nonzero duration.
+                return mDuration > 0;
+            }
+            if (currentTime > mDuration) {
+                return false;
+            }
+
+            double distance = 0.0;
+            switch (mState) {
+                case SPLINE: {
+                    final float t = (float) currentTime / mSplineDuration;
+                    final int index = (int) (NB_SAMPLES * t);
+                    float distanceCoef = 1.f;
+                    float velocityCoef = 0.f;
+                    if (index < NB_SAMPLES) {
+                        final float t_inf = (float) index / NB_SAMPLES;
+                        final float t_sup = (float) (index + 1) / NB_SAMPLES;
+                        final float d_inf = SPLINE_POSITION[index];
+                        final float d_sup = SPLINE_POSITION[index + 1];
+                        velocityCoef = (d_sup - d_inf) / (t_sup - t_inf);
+                        distanceCoef = d_inf + (t - t_inf) * velocityCoef;
+                    }
+
+                    distance = distanceCoef * mSplineDistance;
+                    mCurrVelocity = velocityCoef * mSplineDistance / mSplineDuration * 1000.0f;
+                    break;
+                }
+
+                case BALLISTIC: {
+                    final float t = currentTime / 1000.0f;
+                    mCurrVelocity = mVelocity + mDeceleration * t;
+                    distance = mVelocity * t + mDeceleration * t * t / 2.0f;
+                    break;
+                }
+
+                case CUBIC: {
+                    final float t = (float) (currentTime) / mDuration;
+                    final float t2 = t * t;
+                    final float sign = Math.signum(mVelocity);
+                    distance = sign * mOver * (3.0f * t2 - 2.0f * t * t2);
+                    mCurrVelocity = sign * mOver * 6.0f * (- t + t2);
+                    break;
+                }
+            }
+
+            mCurrentPosition = mStart + (int) Math.round(distance);
+
+            return true;
+        }
+    }
+}
\ No newline at end of file