Merge "Moving slice loading on a background thread" into sc-dev
diff --git a/quickstep/res/layout/taskbar_divider.xml b/quickstep/res/layout/taskbar_divider.xml
new file mode 100644
index 0000000..6e1aa1e
--- /dev/null
+++ b/quickstep/res/layout/taskbar_divider.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 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.
+-->
+
+<View
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="@dimen/taskbar_divider_thickness"
+    android:layout_height="@dimen/taskbar_divider_height"
+    android:layout_marginStart="@dimen/taskbar_icon_spacing"
+    android:layout_marginEnd="@dimen/taskbar_icon_spacing"
+    android:background="@color/taskbar_divider" />
\ No newline at end of file
diff --git a/quickstep/res/values/colors.xml b/quickstep/res/values/colors.xml
index 3bc8ddc..54730f1 100644
--- a/quickstep/res/values/colors.xml
+++ b/quickstep/res/values/colors.xml
@@ -27,4 +27,5 @@
 
     <!-- Taskbar -->
     <color name="taskbar_background">#101010</color>
+    <color name="taskbar_divider">#C0C0C0</color>
 </resources>
\ No newline at end of file
diff --git a/quickstep/res/values/dimens.xml b/quickstep/res/values/dimens.xml
index 39cc0b8..0f40775 100644
--- a/quickstep/res/values/dimens.xml
+++ b/quickstep/res/values/dimens.xml
@@ -127,4 +127,6 @@
     <dimen name="taskbar_icon_drag_icon_size">54dp</dimen>
     <!-- Note that this applies to both sides of all icons, so visible space is double this. -->
     <dimen name="taskbar_icon_spacing">14dp</dimen>
+    <dimen name="taskbar_divider_thickness">1dp</dimen>
+    <dimen name="taskbar_divider_height">24dp</dimen>
 </resources>
diff --git a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
index cbe0eb0..edcd0a2 100644
--- a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
+++ b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
@@ -355,10 +355,6 @@
         // populating workspace.
         // TODO: Find a better place for this
         WellbeingModel.INSTANCE.get(this);
-
-        if (mTaskbarController != null) {
-            mTaskbarController.onHotseatUpdated();
-        }
     }
 
     @Override
diff --git a/quickstep/src/com/android/launcher3/hybridhotseat/HotseatPredictionController.java b/quickstep/src/com/android/launcher3/hybridhotseat/HotseatPredictionController.java
index aa6601b..88cfacb 100644
--- a/quickstep/src/com/android/launcher3/hybridhotseat/HotseatPredictionController.java
+++ b/quickstep/src/com/android/launcher3/hybridhotseat/HotseatPredictionController.java
@@ -20,6 +20,7 @@
 import static com.android.launcher3.hybridhotseat.HotseatEduController.getSettingsIntent;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_HOTSEAT_PREDICTION_PINNED;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_HOTSEAT_RANKED;
+import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 
 import android.animation.Animator;
 import android.animation.AnimatorSet;
@@ -70,7 +71,11 @@
  */
 public class HotseatPredictionController implements DragController.DragListener,
         SystemShortcut.Factory<QuickstepLauncher>, InvariantDeviceProfile.OnIDPChangeListener,
-        DragSource {
+        DragSource, ViewGroup.OnHierarchyChangeListener {
+
+    private static final int FLAG_UPDATE_PAUSED = 1 << 0;
+    private static final int FLAG_DRAG_IN_PROGRESS = 1 << 1;
+    private static final int FLAG_FILL_IN_PROGRESS = 1 << 2;
 
     private int mHotSeatItemsCount;
 
@@ -80,8 +85,7 @@
     private List<ItemInfo> mPredictedItems = Collections.emptyList();
 
     private AnimatorSet mIconRemoveAnimators;
-    private boolean mUIUpdatePaused = false;
-    private boolean mDragInProgress = false;
+    private int mPauseFlags = 0;
 
     private List<PredictedAppIcon.PredictedIconOutlineDrawing> mOutlineDrawings = new ArrayList<>();
 
@@ -114,6 +118,30 @@
         mLauncher.getDragController().addDragListener(this);
 
         launcher.getDeviceProfile().inv.addOnChangeListener(this);
+        mHotseat.getShortcutsAndWidgets().setOnHierarchyChangeListener(this);
+    }
+
+    @Override
+    public void onChildViewAdded(View parent, View child) {
+        onHotseatHierarchyChanged();
+    }
+
+    @Override
+    public void onChildViewRemoved(View parent, View child) {
+        onHotseatHierarchyChanged();
+    }
+
+    private void onHotseatHierarchyChanged() {
+        if (mPauseFlags == 0 && !mLauncher.isWorkspaceLoading()) {
+            // Post update after a single frame to avoid layout within layout
+            MAIN_EXECUTOR.getHandler().post(this::updateFillIfNotLoading);
+        }
+    }
+
+    private void updateFillIfNotLoading() {
+        if (mPauseFlags == 0 && !mLauncher.isWorkspaceLoading()) {
+            fillGapsWithPrediction(true);
+        }
     }
 
     /**
@@ -160,11 +188,11 @@
     }
 
     private void fillGapsWithPrediction() {
-        fillGapsWithPrediction(false, null);
+        fillGapsWithPrediction(false);
     }
 
-    private void fillGapsWithPrediction(boolean animate, Runnable callback) {
-        if (mUIUpdatePaused || mDragInProgress) {
+    private void fillGapsWithPrediction(boolean animate) {
+        if (mPauseFlags != 0) {
             return;
         }
 
@@ -175,12 +203,14 @@
             mIconRemoveAnimators.addListener(new AnimationSuccessListener() {
                 @Override
                 public void onAnimationSuccess(Animator animator) {
-                    fillGapsWithPrediction(animate, callback);
+                    fillGapsWithPrediction(animate);
                     mIconRemoveAnimators.removeListener(this);
                 }
             });
             return;
         }
+
+        mPauseFlags |= FLAG_FILL_IN_PROGRESS;
         for (int rank = 0; rank < mHotSeatItemsCount; rank++) {
             View child = mHotseat.getChildAt(
                     mHotseat.getCellXFromOrder(rank),
@@ -207,10 +237,12 @@
             }
             preparePredictionInfo(predictedItem, rank);
         }
-        bindItems(newItems, animate, callback);
+        bindItems(newItems, animate);
+
+        mPauseFlags &= ~FLAG_FILL_IN_PROGRESS;
     }
 
-    private void bindItems(List<WorkspaceItemInfo> itemsToAdd, boolean animate, Runnable callback) {
+    private void bindItems(List<WorkspaceItemInfo> itemsToAdd, boolean animate) {
         AnimatorSet animationSet = new AnimatorSet();
         for (WorkspaceItemInfo item : itemsToAdd) {
             PredictedAppIcon icon = PredictedAppIcon.createIcon(mHotseat, item);
@@ -221,12 +253,11 @@
             }
         }
         if (animate) {
-            if (callback != null) {
-                animationSet.addListener(AnimationSuccessListener.forRunnable(callback));
-            }
+            animationSet.addListener(AnimationSuccessListener
+                    .forRunnable(this::removeOutlineDrawings));
             animationSet.start();
         } else {
-            if (callback != null) callback.run();
+            removeOutlineDrawings();
         }
 
         if (mLauncher.getTaskbarController() != null) {
@@ -234,6 +265,16 @@
         }
     }
 
+    private void removeOutlineDrawings() {
+        if (mOutlineDrawings.isEmpty()) return;
+        for (PredictedAppIcon.PredictedIconOutlineDrawing outlineDrawing : mOutlineDrawings) {
+            mHotseat.removeDelegatedCellDrawing(outlineDrawing);
+        }
+        mHotseat.invalidate();
+        mOutlineDrawings.clear();
+    }
+
+
     /**
      * Unregisters callbacks and frees resources
      */
@@ -245,11 +286,9 @@
      * start and pauses predicted apps update on the hotseat
      */
     public void setPauseUIUpdate(boolean paused) {
-        if (mLauncher.getTaskbarController() != null) {
-            // Taskbar is present, always allow updates since hotseat is still visible.
-            return;
-        }
-        mUIUpdatePaused = paused;
+        mPauseFlags = paused
+                ? (mPauseFlags | FLAG_UPDATE_PAUSED)
+                : (mPauseFlags & ~FLAG_UPDATE_PAUSED);
         if (!paused) {
             fillGapsWithPrediction();
         }
@@ -365,14 +404,14 @@
         for (PredictedAppIcon.PredictedIconOutlineDrawing outlineDrawing : mOutlineDrawings) {
             mHotseat.addDelegatedCellDrawing(outlineDrawing);
         }
-        mDragInProgress = true;
+        mPauseFlags |= FLAG_DRAG_IN_PROGRESS;
         mHotseat.invalidate();
     }
 
     @Override
     public void onDragEnd() {
-        mDragInProgress = false;
-        fillGapsWithPrediction(true, this::removeOutlineDrawings);
+        mPauseFlags &= ~FLAG_DRAG_IN_PROGRESS;
+        fillGapsWithPrediction(true);
     }
 
     @Nullable
@@ -393,15 +432,6 @@
         itemInfo.screenId = rank;
     }
 
-    private void removeOutlineDrawings() {
-        if (mOutlineDrawings.isEmpty()) return;
-        for (PredictedAppIcon.PredictedIconOutlineDrawing outlineDrawing : mOutlineDrawings) {
-            mHotseat.removeDelegatedCellDrawing(outlineDrawing);
-        }
-        mHotseat.invalidate();
-        mOutlineDrawings.clear();
-    }
-
     @Override
     public void onIdpChanged(int changeFlags, InvariantDeviceProfile profile) {
         this.mHotSeatItemsCount = profile.numHotseatIcons;
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarController.java
index 7608645..6a74aac 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarController.java
@@ -23,6 +23,8 @@
 import static com.android.systemui.shared.system.WindowManagerWrapper.ITYPE_EXTRA_NAVIGATION_BAR;
 
 import android.animation.Animator;
+import android.app.ActivityOptions;
+import android.content.ComponentName;
 import android.graphics.PixelFormat;
 import android.graphics.Point;
 import android.view.Gravity;
@@ -42,8 +44,13 @@
 import com.android.launcher3.states.StateAnimationConfig;
 import com.android.launcher3.touch.ItemClickHandler;
 import com.android.quickstep.AnimatedFloat;
+import com.android.systemui.shared.recents.model.Task;
+import com.android.systemui.shared.system.ActivityManagerWrapper;
 import com.android.systemui.shared.system.WindowManagerWrapper;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Interfaces with Launcher/WindowManager/SystemUI to determine what to show in TaskbarView.
  */
@@ -60,11 +67,17 @@
     private final TaskbarStateHandler mTaskbarStateHandler;
     private final TaskbarVisibilityController mTaskbarVisibilityController;
     private final TaskbarHotseatController mHotseatController;
+    private final TaskbarRecentsController mRecentsController;
     private final TaskbarDragController mDragController;
 
     // Initialized in init().
     private WindowManager.LayoutParams mWindowLayoutParams;
 
+    // Contains all loaded Tasks, not yet deduped from Hotseat items.
+    private List<Task> mLatestLoadedRecentTasks;
+    // Contains all loaded Hotseat items.
+    private ItemInfo[] mLatestLoadedHotseatItems;
+
     public TaskbarController(BaseQuickstepLauncher launcher,
             TaskbarContainerView taskbarContainerView) {
         mLauncher = launcher;
@@ -79,6 +92,8 @@
                 createTaskbarVisibilityControllerCallbacks());
         mHotseatController = new TaskbarHotseatController(mLauncher,
                 createTaskbarHotseatControllerCallbacks());
+        mRecentsController = new TaskbarRecentsController(mLauncher,
+                createTaskbarRecentsControllerCallbacks());
         mDragController = new TaskbarDragController(mLauncher);
     }
 
@@ -101,7 +116,16 @@
         return new TaskbarViewCallbacks() {
             @Override
             public View.OnClickListener getItemOnClickListener() {
-                return ItemClickHandler.INSTANCE;
+                return view -> {
+                    Object tag = view.getTag();
+                    if (tag instanceof Task) {
+                        Task task = (Task) tag;
+                        ActivityManagerWrapper.getInstance().startActivityFromRecents(task.key,
+                                ActivityOptions.makeBasic());
+                    } else {
+                        ItemClickHandler.INSTANCE.onClick(view);
+                    }
+                };
             }
 
             @Override
@@ -116,6 +140,23 @@
             @Override
             public void updateHotseatItems(ItemInfo[] hotseatItemInfos) {
                 mTaskbarView.updateHotseatItems(hotseatItemInfos);
+                mLatestLoadedHotseatItems = hotseatItemInfos;
+                dedupeAndUpdateRecentItems();
+            }
+        };
+    }
+
+    private TaskbarRecentsControllerCallbacks createTaskbarRecentsControllerCallbacks() {
+        return new TaskbarRecentsControllerCallbacks() {
+            @Override
+            public void updateRecentItems(ArrayList<Task> recentTasks) {
+                mLatestLoadedRecentTasks = recentTasks;
+                dedupeAndUpdateRecentItems();
+            }
+
+            @Override
+            public void updateRecentTaskAtIndex(int taskIndex, Task task) {
+                mTaskbarView.updateRecentTaskAtIndex(taskIndex, task);
             }
         };
     }
@@ -124,11 +165,13 @@
      * Initializes the Taskbar, including adding it to the screen.
      */
     public void init() {
-        mTaskbarView.init(mHotseatController.getNumHotseatIcons());
+        mTaskbarView.init(mHotseatController.getNumHotseatIcons(),
+                mRecentsController.getNumRecentIcons());
         addToWindowManager();
         mTaskbarStateHandler.setTaskbarCallbacks(createTaskbarStateHandlerCallbacks());
         mTaskbarVisibilityController.init();
         mHotseatController.init();
+        mRecentsController.init();
     }
 
     private TaskbarStateHandlerCallbacks createTaskbarStateHandlerCallbacks() {
@@ -149,6 +192,7 @@
         mTaskbarStateHandler.setTaskbarCallbacks(null);
         mTaskbarVisibilityController.cleanup();
         mHotseatController.cleanup();
+        mRecentsController.cleanup();
     }
 
     private void removeFromWindowManager() {
@@ -246,6 +290,52 @@
         return mTaskbarView.isDraggingItem();
     }
 
+    private void dedupeAndUpdateRecentItems() {
+        if (mLatestLoadedRecentTasks == null || mLatestLoadedHotseatItems == null) {
+            return;
+        }
+
+        final int numRecentIcons = mRecentsController.getNumRecentIcons();
+
+        // From most recent to least recently opened.
+        List<Task> dedupedTasksInDescendingOrder = new ArrayList<>();
+        for (int i = mLatestLoadedRecentTasks.size() - 1; i >= 0; i--) {
+            Task task = mLatestLoadedRecentTasks.get(i);
+            boolean isTaskInHotseat = false;
+            for (ItemInfo hotseatItem : mLatestLoadedHotseatItems) {
+                if (hotseatItem == null) {
+                    continue;
+                }
+                ComponentName hotseatActivity = hotseatItem.getTargetComponent();
+                if (hotseatActivity != null && task.key.sourceComponent.getPackageName()
+                        .equals(hotseatActivity.getPackageName())) {
+                    isTaskInHotseat = true;
+                    break;
+                }
+            }
+            if (!isTaskInHotseat) {
+                dedupedTasksInDescendingOrder.add(task);
+                if (dedupedTasksInDescendingOrder.size() == numRecentIcons) {
+                    break;
+                }
+            }
+        }
+
+        // TaskbarView expects an array of all the recent tasks to show, in the order to show them.
+        // So we create an array of the proper size, then fill it in such that the most recent items
+        // are at the end. If there aren't enough elements to fill the array, leave them null.
+        Task[] tasksArray = new Task[numRecentIcons];
+        for (int i = 0; i < tasksArray.length; i++) {
+            Task task = i >= dedupedTasksInDescendingOrder.size()
+                    ? null
+                    : dedupedTasksInDescendingOrder.get(i);
+            tasksArray[tasksArray.length - 1 - i] = task;
+        }
+
+        mTaskbarView.updateRecentTasks(tasksArray);
+        mRecentsController.loadIconsForTasks(tasksArray);
+    }
+
     /**
      * @return Whether the given View is in the same window as Taskbar.
      */
@@ -283,4 +373,12 @@
     protected interface TaskbarHotseatControllerCallbacks {
         void updateHotseatItems(ItemInfo[] hotseatItemInfos);
     }
+
+    /**
+     * Contains methods that TaskbarRecentsController can call to interface with TaskbarController.
+     */
+    protected interface TaskbarRecentsControllerCallbacks {
+        void updateRecentItems(ArrayList<Task> recentTasks);
+        void updateRecentTaskAtIndex(int taskIndex, Task task);
+    }
 }
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
index 2318ff9..baec899 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
@@ -25,6 +25,7 @@
 import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.graphics.Point;
+import android.os.UserHandle;
 import android.view.DragEvent;
 import android.view.View;
 
@@ -33,6 +34,7 @@
 import com.android.launcher3.LauncherSettings;
 import com.android.launcher3.R;
 import com.android.launcher3.model.data.WorkspaceItemInfo;
+import com.android.systemui.shared.recents.model.Task;
 import com.android.systemui.shared.system.ClipDescriptionCompat;
 import com.android.systemui.shared.system.LauncherAppsCompat;
 
@@ -102,6 +104,15 @@
                                 item.getIntent().getComponent(), null, item.user));
             }
             intent.putExtra(Intent.EXTRA_USER, item.user);
+        } else if (tag instanceof Task) {
+            Task task = (Task) tag;
+            clipDescription = new ClipDescription(task.titleDescription,
+                    new String[] {
+                            ClipDescriptionCompat.MIMETYPE_APPLICATION_TASK
+                    });
+            intent = new Intent();
+            intent.putExtra(ClipDescriptionCompat.EXTRA_TASK_ID, task.key.id);
+            intent.putExtra(Intent.EXTRA_USER, UserHandle.of(task.key.userId));
         }
 
         if (clipDescription != null && intent != null) {
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarRecentsController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarRecentsController.java
new file mode 100644
index 0000000..9d4e000
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarRecentsController.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2021 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.taskbar;
+
+import com.android.launcher3.BaseQuickstepLauncher;
+import com.android.quickstep.RecentsModel;
+import com.android.quickstep.util.CancellableTask;
+import com.android.systemui.shared.recents.model.Task;
+import com.android.systemui.shared.system.TaskStackChangeListener;
+import com.android.systemui.shared.system.TaskStackChangeListeners;
+
+import java.util.ArrayList;
+
+/**
+ * Works with TaskbarController to update the TaskbarView's Recent items.
+ */
+public class TaskbarRecentsController {
+
+    private final int mNumRecentIcons = 2;
+    private final BaseQuickstepLauncher mLauncher;
+    private final TaskbarController.TaskbarRecentsControllerCallbacks mTaskbarCallbacks;
+    private final RecentsModel mRecentsModel;
+
+    private final TaskStackChangeListener mTaskStackChangeListener = new TaskStackChangeListener() {
+        @Override
+        public void onTaskStackChanged() {
+            reloadRecentTasksIfNeeded();
+        }
+    };
+
+    // TODO: add TaskbarVisualsChangedListener as well (for calendar/clock?)
+
+    // Used to keep track of the last requested task list id, so that we do not request to load the
+    // tasks again if we have already requested it and the task list has not changed
+    private int mTaskListChangeId = -1;
+
+    // The current background requests to load the task icons
+    private CancellableTask[] mIconLoadRequests = new CancellableTask[mNumRecentIcons];
+
+    public TaskbarRecentsController(BaseQuickstepLauncher launcher,
+            TaskbarController.TaskbarRecentsControllerCallbacks taskbarCallbacks) {
+        mLauncher = launcher;
+        mTaskbarCallbacks = taskbarCallbacks;
+        mRecentsModel = RecentsModel.INSTANCE.get(mLauncher);
+    }
+
+    protected void init() {
+        TaskStackChangeListeners.getInstance().registerTaskStackListener(mTaskStackChangeListener);
+        reloadRecentTasksIfNeeded();
+    }
+
+    protected void cleanup() {
+        TaskStackChangeListeners.getInstance().unregisterTaskStackListener(
+                mTaskStackChangeListener);
+        cancelAllPendingIconLoadTasks();
+    }
+
+    private void reloadRecentTasksIfNeeded() {
+        if (!mRecentsModel.isTaskListValid(mTaskListChangeId)) {
+            mTaskListChangeId = mRecentsModel.getTasks(this::onRecentTasksChanged);
+        }
+    }
+
+    private void cancelAllPendingIconLoadTasks() {
+        for (int i = 0; i < mIconLoadRequests.length; i++) {
+            if (mIconLoadRequests[i] != null) {
+                mIconLoadRequests[i].cancel();
+            }
+            mIconLoadRequests[i] = null;
+        }
+    }
+
+    private void onRecentTasksChanged(ArrayList<Task> tasks) {
+        mTaskbarCallbacks.updateRecentItems(tasks);
+    }
+
+    /**
+     * For each Task, loads its icon from the cache in the background, then calls
+     * {@link TaskbarController.TaskbarRecentsControllerCallbacks#updateRecentTaskAtIndex}.
+     */
+    protected void loadIconsForTasks(Task[] tasks) {
+        cancelAllPendingIconLoadTasks();
+        for (int i = 0; i < tasks.length; i++) {
+            Task task = tasks[i];
+            if (task == null) {
+                continue;
+            }
+            final int taskIndex = i;
+            mIconLoadRequests[i] = mRecentsModel.getIconCache().updateIconInBackground(
+                    task, updatedTask -> onTaskIconLoaded(task, taskIndex));
+        }
+    }
+
+    private void onTaskIconLoaded(Task task, int taskIndex) {
+        mTaskbarCallbacks.updateRecentTaskAtIndex(taskIndex, task);
+    }
+
+    protected int getNumRecentIcons() {
+        return mNumRecentIcons;
+    }
+}
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
index c98f09c..d8f3bb5 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarView.java
@@ -19,6 +19,7 @@
 import android.content.res.Resources;
 import android.graphics.RectF;
 import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.view.DragEvent;
 import android.view.LayoutInflater;
@@ -35,6 +36,7 @@
 import com.android.launcher3.R;
 import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.model.data.WorkspaceItemInfo;
+import com.android.systemui.shared.recents.model.Task;
 
 /**
  * Hosts the Taskbar content such as Hotseat and Recent Apps. Drawn on top of other apps.
@@ -52,6 +54,9 @@
     // Initialized in init().
     private int mHotseatStartIndex;
     private int mHotseatEndIndex;
+    private View mHotseatRecentsDivider;
+    private int mRecentsStartIndex;
+    private int mRecentsEndIndex;
 
     private TaskbarController.TaskbarViewCallbacks mControllerCallbacks;
 
@@ -89,10 +94,17 @@
         mControllerCallbacks = taskbarViewCallbacks;
     }
 
-    protected void init(int numHotseatIcons) {
+    protected void init(int numHotseatIcons, int numRecentIcons) {
         mHotseatStartIndex = 0;
         mHotseatEndIndex = mHotseatStartIndex + numHotseatIcons - 1;
         updateHotseatItems(new ItemInfo[numHotseatIcons]);
+
+        int dividerIndex = mHotseatEndIndex + 1;
+        mHotseatRecentsDivider = addDivider(dividerIndex);
+
+        mRecentsStartIndex = dividerIndex + 1;
+        mRecentsEndIndex = mRecentsStartIndex + numRecentIcons - 1;
+        updateRecentTasks(new Task[numRecentIcons]);
     }
 
     protected void cleanup() {
@@ -147,6 +159,93 @@
                 hotseatView.setOnLongClickListener(null);
             }
         }
+
+        updateHotseatRecentsDividerVisibility();
+    }
+
+    private View addDivider(int dividerIndex) {
+        View divider = inflate(R.layout.taskbar_divider);
+        addView(divider, dividerIndex);
+        return divider;
+    }
+
+    /**
+     * Inflates/binds the Recents items to show in the Taskbar given their Tasks.
+     */
+    protected void updateRecentTasks(Task[] tasks) {
+        for (int i = 0; i < tasks.length; i++) {
+            Task task = tasks[i];
+            int recentsIndex = mRecentsStartIndex + i;
+            View recentsView = getChildAt(recentsIndex);
+
+            // Inflate empty icon Views.
+            if (recentsView == null) {
+                BubbleTextView btv = (BubbleTextView) inflate(R.layout.taskbar_app_icon);
+                LayoutParams lp = new LayoutParams(btv.getIconSize(), btv.getIconSize());
+                lp.setMargins(mItemMarginLeftRight, 0, mItemMarginLeftRight, 0);
+                recentsView = btv;
+                addView(recentsView, recentsIndex, lp);
+            }
+
+            // Apply the Task, or hide the view if there is none for a given index.
+            if (recentsView instanceof BubbleTextView && task != null) {
+                applyTaskToBubbleTextView((BubbleTextView) recentsView, task);
+                recentsView.setVisibility(VISIBLE);
+                recentsView.setOnClickListener(mControllerCallbacks.getItemOnClickListener());
+                recentsView.setOnLongClickListener(
+                        mControllerCallbacks.getItemOnLongClickListener());
+            } else {
+                recentsView.setVisibility(GONE);
+                recentsView.setOnClickListener(null);
+                recentsView.setOnLongClickListener(null);
+            }
+        }
+
+        updateHotseatRecentsDividerVisibility();
+    }
+
+    private void applyTaskToBubbleTextView(BubbleTextView btv, Task task) {
+        if (task.icon != null) {
+            Drawable icon = task.icon.getConstantState().newDrawable().mutate();
+            btv.applyIconAndLabel(icon, task.titleDescription);
+        }
+        btv.setTag(task);
+    }
+
+    protected void updateRecentTaskAtIndex(int taskIndex, Task task) {
+        View taskView = getChildAt(mRecentsStartIndex + taskIndex);
+        if (taskView instanceof BubbleTextView) {
+            applyTaskToBubbleTextView((BubbleTextView) taskView, task);
+        }
+    }
+
+    /**
+     * Make the divider VISIBLE between the Hotseat and Recents if there is at least one icon in
+     * each, otherwise make it GONE.
+     */
+    private void updateHotseatRecentsDividerVisibility() {
+        if (mHotseatRecentsDivider == null) {
+            return;
+        }
+
+        boolean hasAtLeastOneHotseatItem = false;
+        for (int i = mHotseatStartIndex; i <= mHotseatEndIndex; i++) {
+            if (getChildAt(i).getVisibility() != GONE) {
+                hasAtLeastOneHotseatItem = true;
+                break;
+            }
+        }
+
+        boolean hasAtLeastOneRecentItem = false;
+        for (int i = mRecentsStartIndex; i <= mRecentsEndIndex; i++) {
+            if (getChildAt(i).getVisibility() != GONE) {
+                hasAtLeastOneRecentItem = true;
+                break;
+            }
+        }
+
+        mHotseatRecentsDivider.setVisibility(hasAtLeastOneHotseatItem && hasAtLeastOneRecentItem
+                ? VISIBLE : GONE);
     }
 
     @Override
diff --git a/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java b/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
index ee00ed2..9a1e707 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
@@ -17,6 +17,7 @@
 
 import static android.view.accessibility.AccessibilityEvent.TYPE_VIEW_FOCUSED;
 
+import static com.android.launcher3.LauncherSettings.Favorites.CONTAINER_HOTSEAT;
 import static com.android.launcher3.LauncherSettings.Favorites.ITEM_TYPE_APPLICATION;
 import static com.android.launcher3.LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT;
 import static com.android.launcher3.LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT;
@@ -54,6 +55,7 @@
 import com.android.launcher3.logging.StatsLogManager.StatsLogger;
 import com.android.launcher3.model.BgDataModel.FixedContainerItems;
 import com.android.launcher3.model.data.ItemInfo;
+import com.android.launcher3.model.data.WorkspaceItemInfo;
 import com.android.launcher3.popup.SystemShortcut;
 import com.android.launcher3.search.DeviceSearchAdapterProvider;
 import com.android.launcher3.statemanager.StateManager.AtomicAnimationFactory;
@@ -82,6 +84,7 @@
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.stream.Stream;
@@ -164,7 +167,8 @@
     @Override
     public boolean startActivitySafely(View v, Intent intent, ItemInfo item) {
         if (mHotseatPredictionController != null) {
-            mHotseatPredictionController.setPauseUIUpdate(true);
+            // Only pause is taskbar controller is not present
+            mHotseatPredictionController.setPauseUIUpdate(getTaskbarController() == null);
         }
         return super.startActivitySafely(v, intent, item);
     }
@@ -230,6 +234,15 @@
     }
 
     @Override
+    public void bindWorkspaceItemsChanged(List<WorkspaceItemInfo> updated) {
+        super.bindWorkspaceItemsChanged(updated);
+        if (getTaskbarController() != null && updated.stream()
+                .filter(w -> w.container == CONTAINER_HOTSEAT).findFirst().isPresent()) {
+            getTaskbarController().onHotseatUpdated();
+        }
+    }
+
+    @Override
     public void onDestroy() {
         super.onDestroy();
         getAppsView().getSearchUiManager().destroy();
diff --git a/quickstep/src/com/android/quickstep/SystemUiProxy.java b/quickstep/src/com/android/quickstep/SystemUiProxy.java
index ca55468..85b21e0 100644
--- a/quickstep/src/com/android/quickstep/SystemUiProxy.java
+++ b/quickstep/src/com/android/quickstep/SystemUiProxy.java
@@ -17,6 +17,7 @@
 
 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 
+import android.app.PendingIntent;
 import android.app.PictureInPictureParams;
 import android.content.ComponentName;
 import android.content.Context;
@@ -24,15 +25,18 @@
 import android.graphics.Bitmap;
 import android.graphics.Insets;
 import android.graphics.Rect;
+import android.os.Binder;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.os.IBinder.DeathRecipient;
 import android.os.RemoteException;
+import android.os.UserHandle;
 import android.util.Log;
 import android.view.MotionEvent;
 
 import com.android.launcher3.util.MainThreadInitializedObject;
 import com.android.systemui.shared.recents.IPinnedStackAnimationListener;
+import com.android.systemui.shared.recents.ISplitScreenListener;
 import com.android.systemui.shared.recents.ISystemUiProxy;
 import com.android.systemui.shared.recents.model.Task;
 import com.android.systemui.shared.system.RemoteTransitionCompat;
@@ -431,4 +435,84 @@
             }
         }
     }
+
+    @Override
+    public void registerSplitScreenListener(ISplitScreenListener listener) {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.registerSplitScreenListener(listener);
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call registerSplitScreenListener");
+            }
+        }
+    }
+
+    @Override
+    public void unregisterSplitScreenListener(ISplitScreenListener listener) {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.unregisterSplitScreenListener(listener);
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call unregisterSplitScreenListener");
+            }
+        }
+    }
+
+    @Override
+    public void setSideStageVisibility(boolean visible) {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.setSideStageVisibility(visible);
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call setSideStageVisibility");
+            }
+        }
+    }
+
+    @Override
+    public void exitSplitScreen() {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.exitSplitScreen();
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call exitSplitScreen");
+            }
+        }
+    }
+
+    @Override
+    public void startTask(int taskId, int stage, int position, Bundle options) {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.startTask(taskId, stage, position, options);
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call startTask");
+            }
+        }
+    }
+
+    @Override
+    public void startShortcut(String packageName, String shortcutId, int stage, int position,
+            Bundle options, UserHandle user) {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.startShortcut(packageName, shortcutId, stage, position, options,
+                        user);
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call startShortcut");
+            }
+        }
+    }
+
+    @Override
+    public void startIntent(PendingIntent intent, int stage, int position, Bundle options) {
+        if (mSystemUiProxy != null) {
+            try {
+                mSystemUiProxy.startIntent(intent, stage, position, options);
+            } catch (RemoteException e) {
+                Log.w(TAG, "Failed call startIntent");
+            }
+        }
+    }
+
 }
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index 2f2b566..d9d0a93 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -2277,7 +2277,9 @@
     }
 
     public void redrawLiveTile() {
-        mLiveTileTaskViewSimulator.apply(mLiveTileParams);
+        if (mLiveTileParams.getTargetSet() != null) {
+            mLiveTileTaskViewSimulator.apply(mLiveTileParams);
+        }
     }
 
     public TaskViewSimulator getLiveTileTaskViewSimulator() {
diff --git a/src/com/android/launcher3/BubbleTextView.java b/src/com/android/launcher3/BubbleTextView.java
index 2367249..21297c9 100644
--- a/src/com/android/launcher3/BubbleTextView.java
+++ b/src/com/android/launcher3/BubbleTextView.java
@@ -359,6 +359,16 @@
     }
 
     /**
+     * Directly set the icon and label.
+     */
+    @UiThread
+    public void applyIconAndLabel(Drawable icon, CharSequence label) {
+        setIcon(icon);
+        setText(label);
+        setContentDescription(label);
+    }
+
+    /**
      * Overrides the default long press timeout.
      */
     public void setLongPressTimeoutFactor(float longPressTimeoutFactor) {
diff --git a/src/com/android/launcher3/DeviceProfile.java b/src/com/android/launcher3/DeviceProfile.java
index f681d75..4d5bd5d 100644
--- a/src/com/android/launcher3/DeviceProfile.java
+++ b/src/com/android/launcher3/DeviceProfile.java
@@ -168,8 +168,10 @@
         // Constants from resources
         float swDPs = Utilities.dpiFromPx(
                 Math.min(info.smallestSize.x, info.smallestSize.y), info.metrics);
-        isTablet = swDPs >= TABLET_MIN_DPS;
-        isLargeTablet = swDPs >= LARGE_TABLET_MIN_DPS;
+        boolean allowRotation = context.getResources().getBoolean(R.bool.allow_rotation);
+        // Tablet UI is built with assumption that simulated landscape is disabled.
+        isTablet = allowRotation && swDPs >= TABLET_MIN_DPS;
+        isLargeTablet = isTablet && swDPs >= LARGE_TABLET_MIN_DPS;
         isPhone = !isTablet && !isLargeTablet;
         aspectRatio = ((float) Math.max(widthPx, heightPx)) / Math.min(widthPx, heightPx);
         boolean isTallDevice = Float.compare(aspectRatio, TALL_DEVICE_ASPECT_RATIO_THRESHOLD) >= 0;
diff --git a/src/com/android/launcher3/model/AllAppsList.java b/src/com/android/launcher3/model/AllAppsList.java
index d4fa278..e3e4b69 100644
--- a/src/com/android/launcher3/model/AllAppsList.java
+++ b/src/com/android/launcher3/model/AllAppsList.java
@@ -203,11 +203,16 @@
     /**
      * Add the icons for the supplied apk called packageName.
      */
-    public void addPackage(Context context, String packageName, UserHandle user) {
-        for (LauncherActivityInfo info : context.getSystemService(LauncherApps.class)
-                .getActivityList(packageName, user)) {
+    public List<LauncherActivityInfo> addPackage(
+            Context context, String packageName, UserHandle user) {
+        List<LauncherActivityInfo> activities = context.getSystemService(LauncherApps.class)
+                .getActivityList(packageName, user);
+
+        for (LauncherActivityInfo info : activities) {
             add(new AppInfo(context, info, user), info);
         }
+
+        return activities;
     }
 
     /**
@@ -250,7 +255,8 @@
     /**
      * Add and remove icons for this package which has been updated.
      */
-    public void updatePackage(Context context, String packageName, UserHandle user) {
+    public List<LauncherActivityInfo> updatePackage(
+            Context context, String packageName, UserHandle user) {
         final List<LauncherActivityInfo> matches = context.getSystemService(LauncherApps.class)
                 .getActivityList(packageName, user);
         if (matches.size() > 0) {
@@ -297,6 +303,8 @@
                 }
             }
         }
+
+        return matches;
     }
 
     /**
diff --git a/src/com/android/launcher3/model/PackageUpdatedTask.java b/src/com/android/launcher3/model/PackageUpdatedTask.java
index 3275d59..f13a109 100644
--- a/src/com/android/launcher3/model/PackageUpdatedTask.java
+++ b/src/com/android/launcher3/model/PackageUpdatedTask.java
@@ -22,6 +22,7 @@
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.content.pm.LauncherActivityInfo;
 import android.content.pm.LauncherApps;
 import android.content.pm.ShortcutInfo;
 import android.os.UserHandle;
@@ -51,6 +52,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 
@@ -95,6 +97,7 @@
                 ? ItemInfoMatcher.ofUser(mUser) // We want to update all packages for this user
                 : ItemInfoMatcher.ofPackages(packageSet, mUser);
         final HashSet<ComponentName> removedComponents = new HashSet<>();
+        final HashMap<String, List<LauncherActivityInfo>> activitiesLists = new HashMap<>();
 
         switch (mOp) {
             case OP_ADD: {
@@ -104,7 +107,8 @@
                     if (FeatureFlags.PROMISE_APPS_IN_ALL_APPS.get()) {
                         appsList.removePackage(packages[i], mUser);
                     }
-                    appsList.addPackage(context, packages[i], mUser);
+                    activitiesLists.put(
+                            packages[i], appsList.addPackage(context, packages[i], mUser));
                 }
                 flagOp = FlagOp.removeFlag(WorkspaceItemInfo.FLAG_DISABLED_NOT_AVAILABLE);
                 break;
@@ -115,7 +119,8 @@
                     for (int i = 0; i < N; i++) {
                         if (DEBUG) Log.d(TAG, "mAllAppsList.updatePackage " + packages[i]);
                         iconCache.updateIconsForPkg(packages[i], mUser);
-                        appsList.updatePackage(context, packages[i], mUser);
+                        activitiesLists.put(
+                                packages[i], appsList.updatePackage(context, packages[i], mUser));
                         app.getWidgetCache().removePackage(packages[i], mUser);
                     }
                 }
@@ -247,7 +252,14 @@
 
                         if (isNewApkAvailable
                                 && si.itemType == Favorites.ITEM_TYPE_APPLICATION) {
-                            si.setProgressLevel(100, PackageInstallInfo.STATUS_INSTALLED);
+                            List<LauncherActivityInfo> activities = activitiesLists.get(
+                                    packageName);
+                            si.setProgressLevel(
+                                    activities == null || activities.isEmpty()
+                                            ? 100
+                                            : PackageManagerHelper.getLoadingProgress(
+                                                    activities.get(0)),
+                                    PackageInstallInfo.STATUS_INSTALLED_DOWNLOADING);
                             iconCache.getTitleAndIcon(si, si.usingLowResIcon());
                             infoUpdated = true;
                         }