Merge changes from topic 'recents_transition' into nyc-dev

* changes:
  Implement transition for docking task in recents #6
  Implement transition for docking task in recents #5
  Implement transition for docking task in recents #4
  Implement transition for docking task in recents #3
  Implement transition for docking task in recents #2
  Implement transition for docking task in recents #1
  Show a scrim activity if task is not resizable
diff --git a/core/java/android/animation/KeyframeSet.java b/core/java/android/animation/KeyframeSet.java
index 32edd4d..77df151 100644
--- a/core/java/android/animation/KeyframeSet.java
+++ b/core/java/android/animation/KeyframeSet.java
@@ -29,8 +29,9 @@
  * This class holds a collection of Keyframe objects and is called by ValueAnimator to calculate
  * values between those keyframes for a given animation. The class internal to the animation
  * package because it is an implementation detail of how Keyframes are stored and used.
+ * @hide
  */
-class KeyframeSet implements Keyframes {
+public class KeyframeSet implements Keyframes {
 
     int mNumKeyframes;
 
diff --git a/core/java/android/animation/Keyframes.java b/core/java/android/animation/Keyframes.java
index c149bed..e40a86c 100644
--- a/core/java/android/animation/Keyframes.java
+++ b/core/java/android/animation/Keyframes.java
@@ -20,8 +20,9 @@
 /**
  * This interface abstracts a collection of Keyframe objects and is called by
  * ValueAnimator to calculate values between those keyframes for a given animation.
+ * @hide
  */
-interface Keyframes extends Cloneable {
+public interface Keyframes extends Cloneable {
 
     /**
      * Sets the TypeEvaluator to be used when calculating animated values. This object
diff --git a/core/java/android/animation/PathKeyframes.java b/core/java/android/animation/PathKeyframes.java
index 8230ac5..50a490e 100644
--- a/core/java/android/animation/PathKeyframes.java
+++ b/core/java/android/animation/PathKeyframes.java
@@ -34,8 +34,9 @@
  * Typically, the returned type is a PointF, but the individual components can be extracted
  * as either an IntKeyframes or FloatKeyframes.
  * </p>
+ * @hide
  */
-class PathKeyframes implements Keyframes {
+public class PathKeyframes implements Keyframes {
     private static final int FRACTION_OFFSET = 0;
     private static final int X_OFFSET = 1;
     private static final int Y_OFFSET = 2;
diff --git a/core/java/android/app/ActivityManagerInternal.java b/core/java/android/app/ActivityManagerInternal.java
index 7310d67..5116634 100644
--- a/core/java/android/app/ActivityManagerInternal.java
+++ b/core/java/android/app/ActivityManagerInternal.java
@@ -114,4 +114,15 @@
      *               values.
      */
     public abstract void notifyAppTransitionStarting(int reason);
+
+    /**
+     * Callback for window manager to let activity manager know that the app transition was
+     * cancelled.
+     */
+    public abstract void notifyAppTransitionCancelled();
+
+    /**
+     * Callback for window manager to let activity manager know that the app transition is finished.
+     */
+    public abstract void notifyAppTransitionFinished();
 }
diff --git a/core/java/android/app/ActivityOptions.java b/core/java/android/app/ActivityOptions.java
index 167e6cb..2846798 100644
--- a/core/java/android/app/ActivityOptions.java
+++ b/core/java/android/app/ActivityOptions.java
@@ -154,6 +154,12 @@
     private static final String KEY_LAUNCH_STACK_ID = "android.activity.launchStackId";
 
     /**
+     * The task id the activity should be launched into.
+     * @hide
+     */
+    private static final String KEY_LAUNCH_TASK_ID = "android.activity.launchTaskId";
+
+    /**
      * Where the docked stack should be positioned.
      * @hide
      */
@@ -224,6 +230,7 @@
     private int mExitCoordinatorIndex;
     private PendingIntent mUsageTimeReport;
     private int mLaunchStackId = INVALID_STACK_ID;
+    private int mLaunchTaskId = -1;
     private int mDockCreateMode = DOCKED_STACK_CREATE_MODE_TOP_OR_LEFT;
     private AppTransitionAnimationSpec mAnimSpecs[];
 
@@ -766,6 +773,7 @@
                 break;
         }
         mLaunchStackId = opts.getInt(KEY_LAUNCH_STACK_ID, INVALID_STACK_ID);
+        mLaunchTaskId = opts.getInt(KEY_LAUNCH_TASK_ID, -1);
         mDockCreateMode = opts.getInt(KEY_DOCK_CREATE_MODE, DOCKED_STACK_CREATE_MODE_TOP_OR_LEFT);
         if (opts.containsKey(KEY_ANIM_SPECS)) {
             Parcelable[] specs = opts.getParcelableArray(KEY_ANIM_SPECS);
@@ -927,6 +935,21 @@
         mLaunchStackId = launchStackId;
     }
 
+    /**
+     * Sets the task the activity will be launched in.
+     * @hide
+     */
+    public void setLaunchTaskId(int taskId) {
+        mLaunchTaskId = taskId;
+    }
+
+    /**
+     * @hide
+     */
+    public int getLaunchTaskId() {
+        return mLaunchTaskId;
+    }
+
     /** @hide */
     public int getDockCreateMode() {
         return mDockCreateMode;
@@ -1079,6 +1102,7 @@
                 break;
         }
         b.putInt(KEY_LAUNCH_STACK_ID, mLaunchStackId);
+        b.putInt(KEY_LAUNCH_TASK_ID, mLaunchTaskId);
         b.putInt(KEY_DOCK_CREATE_MODE, mDockCreateMode);
         if (mAnimSpecs != null) {
             b.putParcelableArray(KEY_ANIM_SPECS, mAnimSpecs);
diff --git a/core/java/android/app/ContextImpl.java b/core/java/android/app/ContextImpl.java
index 63a6829..d28f1fb 100644
--- a/core/java/android/app/ContextImpl.java
+++ b/core/java/android/app/ContextImpl.java
@@ -803,7 +803,12 @@
     @Override
     public void startActivity(Intent intent, Bundle options) {
         warnIfCallingFromSystemProcess();
-        if ((intent.getFlags()&Intent.FLAG_ACTIVITY_NEW_TASK) == 0) {
+
+        // Calling start activity from outside an activity without FLAG_ACTIVITY_NEW_TASK is
+        // generally not allowed, except if the caller specifies the task id the activity should
+        // be launched in.
+        if ((intent.getFlags()&Intent.FLAG_ACTIVITY_NEW_TASK) == 0
+                && options != null && ActivityOptions.fromBundle(options).getLaunchTaskId() == -1) {
             throw new AndroidRuntimeException(
                     "Calling startActivity() from outside of an Activity "
                     + " context requires the FLAG_ACTIVITY_NEW_TASK flag."
diff --git a/core/java/android/app/ITaskStackListener.aidl b/core/java/android/app/ITaskStackListener.aidl
index 6432558..fa67529 100644
--- a/core/java/android/app/ITaskStackListener.aidl
+++ b/core/java/android/app/ITaskStackListener.aidl
@@ -35,4 +35,9 @@
      * Called whenever the pinned stack is done animating a resize.
      */
     void onPinnedStackAnimationEnded();
+
+    /**
+     * Called when we launched an activity that we forced to be resizable.
+     */
+    void onActivityForcedResizable(String packageName, int taskId);
 }
diff --git a/core/java/com/android/internal/statusbar/IStatusBar.aidl b/core/java/com/android/internal/statusbar/IStatusBar.aidl
index b243cac..9e5c238 100644
--- a/core/java/com/android/internal/statusbar/IStatusBar.aidl
+++ b/core/java/com/android/internal/statusbar/IStatusBar.aidl
@@ -88,6 +88,11 @@
      */
     void appTransitionStarting(long statusBarAnimationsStartTime, long statusBarAnimationsDuration);
 
+    /**
+     * Notifies the status bar that an app transition is done.
+     */
+    void appTransitionFinished();
+
     void showAssistDisclosure();
     void startAssist(in Bundle args);
 
diff --git a/packages/SystemUI/AndroidManifest.xml b/packages/SystemUI/AndroidManifest.xml
index 589eac6..9839446 100644
--- a/packages/SystemUI/AndroidManifest.xml
+++ b/packages/SystemUI/AndroidManifest.xml
@@ -263,6 +263,14 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".stackdivider.ForcedResizableInfoActivity"
+            android:theme="@style/ForcedResizableTheme"
+            android:excludeFromRecents="true"
+            android:stateNotNeeded="true"
+            android:exported="false">
+        </activity>
+
         <!-- Callback for dismissing screenshot notification after a share target is picked -->
         <receiver android:name=".screenshot.GlobalScreenshot$TargetChosenReceiver"
                   android:process=":screenshot"
diff --git a/packages/SystemUI/res/anim/forced_resizable_enter.xml b/packages/SystemUI/res/anim/forced_resizable_enter.xml
new file mode 100644
index 0000000..01b8fdb
--- /dev/null
+++ b/packages/SystemUI/res/anim/forced_resizable_enter.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016 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
+  -->
+<alpha xmlns:android="http://schemas.android.com/apk/res/android"
+    android:fromAlpha="0.0"
+    android:toAlpha="1.0"
+    android:interpolator="@android:interpolator/linear_out_slow_in"
+    android:duration="280" />
diff --git a/packages/SystemUI/res/anim/forced_resizable_exit.xml b/packages/SystemUI/res/anim/forced_resizable_exit.xml
new file mode 100644
index 0000000..6f316a7
--- /dev/null
+++ b/packages/SystemUI/res/anim/forced_resizable_exit.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016 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
+  -->
+<alpha xmlns:android="http://schemas.android.com/apk/res/android"
+    android:fromAlpha="1.0"
+    android:toAlpha="0.0"
+    android:duration="160"
+    android:interpolator="@android:interpolator/fast_out_linear_in"
+    android:zAdjustment="top"/>
\ No newline at end of file
diff --git a/packages/SystemUI/res/layout/forced_resizable_activity.xml b/packages/SystemUI/res/layout/forced_resizable_activity.xml
new file mode 100644
index 0000000..df245bc
--- /dev/null
+++ b/packages/SystemUI/res/layout/forced_resizable_activity.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2016 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
+  -->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="@string/forced_resizable_info_text"
+        android:textColor="#ffffff"/>
+</FrameLayout>
\ No newline at end of file
diff --git a/packages/SystemUI/res/values/colors.xml b/packages/SystemUI/res/values/colors.xml
index 4f3db05..b9aa26b 100644
--- a/packages/SystemUI/res/values/colors.xml
+++ b/packages/SystemUI/res/values/colors.xml
@@ -151,6 +151,7 @@
 
     <color name="docked_divider_background">#ff000000</color>
     <color name="docked_divider_handle">#ffffff</color>
+    <drawable name="forced_resizable_background">#80000000</drawable>
 
     <color name="default_remote_input_background">@*android:color/notification_default_color</color>
     <color name="remote_input_hint">#99ffffff</color>
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index 6f0f30d..25ecd888 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -1530,4 +1530,6 @@
     <!-- Accessibility action for moving down the docked stack divider [CHAR LIMIT=NONE] -->
     <string name="accessibility_action_divider_move_right">Move right</string>
 
+    <!-- Text that gets shown on top of current activity to inform the user that the system force-resized the current activity and that things might crash/not work properly [CHAR LIMIT=NONE] -->
+    <string name="forced_resizable_info_text">App may not work with multi-window</string>
 </resources>
diff --git a/packages/SystemUI/res/values/styles.xml b/packages/SystemUI/res/values/styles.xml
index 21ad216..2b134af 100644
--- a/packages/SystemUI/res/values/styles.xml
+++ b/packages/SystemUI/res/values/styles.xml
@@ -40,6 +40,18 @@
         <item name="android:windowBackground">@android:color/black</item>
     </style>
 
+    <!-- Theme used for the activity that shows when the system forced an app to be resizable -->
+    <style name="ForcedResizableTheme" parent="@android:style/Theme.Translucent.NoTitleBar.Fullscreen">
+        <item name="android:windowBackground">@drawable/forced_resizable_background</item>
+        <item name="android:statusBarColor">@color/transparent</item>
+        <item name="android:windowAnimationStyle">@style/Animation.ForcedResizable</item>
+    </style>
+
+    <style name="Animation.ForcedResizable" parent="@android:style/Animation">
+        <item name="android:activityOpenEnterAnimation">@anim/forced_resizable_enter</item>
+        <item name="android:activityCloseExitAnimation">@anim/forced_resizable_exit</item>
+    </style>
+
     <style name="TextAppearance.StatusBar.HeadsUp"
         parent="@*android:style/TextAppearance.StatusBar">
     </style>
diff --git a/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java b/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java
index 1261a9a..9cba93b 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java
@@ -34,6 +34,7 @@
 import android.view.View;
 import android.view.ViewTreeObserver;
 import android.view.WindowManager;
+import android.view.WindowManager.LayoutParams;
 
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.logging.MetricsProto.MetricsEvent;
@@ -43,6 +44,7 @@
 import com.android.systemui.recents.events.activity.ConfigurationChangedEvent;
 import com.android.systemui.recents.events.activity.DebugFlagsChangedEvent;
 import com.android.systemui.recents.events.activity.DismissRecentsToHomeAnimationStarted;
+import com.android.systemui.recents.events.activity.DockedFirstAnimationFrameEvent;
 import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationCompletedEvent;
 import com.android.systemui.recents.events.activity.EnterRecentsWindowLastAnimationFrameEvent;
 import com.android.systemui.recents.events.activity.ExitRecentsWindowFirstAnimationFrameEvent;
@@ -281,6 +283,8 @@
         IntentFilter filter = new IntentFilter();
         filter.addAction(Intent.ACTION_SCREEN_OFF);
         registerReceiver(mSystemBroadcastReceiver, filter);
+
+        getWindow().addPrivateFlags(LayoutParams.PRIVATE_FLAG_NO_MOVE_ANIMATION);
     }
 
     @Override
@@ -602,6 +606,11 @@
         mRecentsView.invalidate();
     }
 
+    public final void onBusEvent(DockedFirstAnimationFrameEvent event) {
+        mRecentsView.getViewTreeObserver().addOnPreDrawListener(this);
+        mRecentsView.invalidate();
+    }
+
     public final void onBusEvent(CancelEnterRecentsWindowAnimationEvent event) {
         RecentsActivityLaunchState launchState = Recents.getConfiguration().getLaunchState();
         int launchToTaskId = launchState.launchedToTaskId;
diff --git a/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java b/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
index 3ff33a8..fce120a 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
@@ -43,8 +43,10 @@
 import com.android.systemui.R;
 import com.android.systemui.SystemUIApplication;
 import com.android.systemui.recents.events.EventBus;
+import com.android.systemui.recents.events.EventBus.Event;
 import com.android.systemui.recents.events.activity.DockedTopTaskEvent;
 import com.android.systemui.recents.events.activity.EnterRecentsWindowLastAnimationFrameEvent;
+import com.android.systemui.recents.events.activity.ForcedResizableEvent;
 import com.android.systemui.recents.events.activity.HideRecentsEvent;
 import com.android.systemui.recents.events.activity.IterateRecentsEvent;
 import com.android.systemui.recents.events.activity.LaunchNextTaskRequestEvent;
@@ -124,6 +126,13 @@
                 loader.loadTasks(mContext, plan, launchOpts);
             }
         }
+
+        @Override
+        public void onActivityForcedResizable(String packageName, int taskId) {
+            EventBus.getDefault().sendOntoMainThread(
+                    new ForcedResizableEvent(packageName, taskId));
+
+        }
     }
 
     protected static RecentsTaskLoadPlan sInstanceLoadPlan;
diff --git a/packages/SystemUI/src/com/android/systemui/recents/events/activity/AppTransitionFinishedEvent.java b/packages/SystemUI/src/com/android/systemui/recents/events/activity/AppTransitionFinishedEvent.java
new file mode 100644
index 0000000..4738eed
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/recents/events/activity/AppTransitionFinishedEvent.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 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.systemui.recents.events.activity;
+
+import com.android.systemui.recents.events.EventBus;
+
+/**
+ * Sent when an app transition has finished playing.
+ */
+public class AppTransitionFinishedEvent extends EventBus.Event {
+}
diff --git a/packages/SystemUI/src/com/android/systemui/recents/events/activity/DockedFirstAnimationFrameEvent.java b/packages/SystemUI/src/com/android/systemui/recents/events/activity/DockedFirstAnimationFrameEvent.java
new file mode 100644
index 0000000..32d9a70
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/recents/events/activity/DockedFirstAnimationFrameEvent.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 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.systemui.recents.events.activity;
+
+import com.android.systemui.recents.events.EventBus.Event;
+
+/**
+ * Sent when the window animation has started when docking a task
+ */
+public class DockedFirstAnimationFrameEvent extends Event {
+}
diff --git a/packages/SystemUI/src/com/android/systemui/recents/events/activity/ForcedResizableEvent.java b/packages/SystemUI/src/com/android/systemui/recents/events/activity/ForcedResizableEvent.java
new file mode 100644
index 0000000..cdcabf0
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/recents/events/activity/ForcedResizableEvent.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2016 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.systemui.recents.events.activity;
+
+import com.android.systemui.recents.events.EventBus;
+
+/**
+ * Sent when recents received the information that an activity got forced resizable, and we need
+ * to inform the user about that.
+ */
+public class ForcedResizableEvent extends EventBus.Event {
+
+    public final String packageName;
+    public final int taskId;
+
+    public ForcedResizableEvent(String packageName, int taskId) {
+        this.packageName = packageName;
+        this.taskId = taskId;
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java b/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
index ea4888d..1e624fd 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/misc/SystemServicesProxy.java
@@ -52,6 +52,7 @@
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
 import android.os.Handler;
+import android.os.IRemoteCallback;
 import android.os.Looper;
 import android.os.Message;
 import android.os.ParcelFileDescriptor;
@@ -64,9 +65,8 @@
 import android.util.Log;
 import android.util.MutableBoolean;
 import android.view.Display;
+import android.view.IAppTransitionAnimationSpecsFuture;
 import android.view.IDockedStackListener;
-import android.view.Surface;
-import android.view.View;
 import android.view.WindowManager;
 import android.view.WindowManager.KeyboardShortcutsReceiver;
 import android.view.WindowManagerGlobal;
@@ -141,6 +141,7 @@
         public void onActivityPinned() { }
         public void onPinnedActivityRestartAttempt() { }
         public void onPinnedStackAnimationEnded() { }
+        public void onActivityForcedResizable(String packageName, int taskId) { }
     }
 
     /**
@@ -172,10 +173,17 @@
             mHandler.removeMessages(H.ON_PINNED_STACK_ANIMATION_ENDED);
             mHandler.sendEmptyMessage(H.ON_PINNED_STACK_ANIMATION_ENDED);
         }
+
+        @Override
+        public void onActivityForcedResizable(String packageName, int taskId)
+                throws RemoteException {
+            mHandler.obtainMessage(H.ON_ACTIVITY_FORCED_RESIZABLE, taskId, 0, packageName)
+                    .sendToTarget();
+        }
     };
 
     /**
-     * List of {@link TaskStackListener} registered from {@link registerTaskStackListener}.
+     * List of {@link TaskStackListener} registered from {@link #registerTaskStackListener}.
      */
     private List<TaskStackListener> mTaskStackListeners = new ArrayList<>();
 
@@ -393,13 +401,12 @@
     }
 
     /** Docks a task to the side of the screen and starts it. */
-    public void startTaskInDockedMode(Context context, View view, int taskId, int createMode) {
+    public void startTaskInDockedMode(int taskId, int createMode) {
         if (mIam == null) return;
 
         try {
             // TODO: Determine what animation we want for the incoming task
-            final ActivityOptions options = ActivityOptions.makeThumbnailAspectScaleUpAnimation(
-                    view, null, 0, 0, view.getWidth(), view.getHeight(), null, null);
+            final ActivityOptions options = ActivityOptions.makeBasic();
             options.setDockCreateMode(createMode);
             options.setLaunchStackId(DOCKED_STACK_ID);
             mIam.startActivityFromRecents(taskId, options.toBundle());
@@ -1045,11 +1052,24 @@
         }
     }
 
+    public void overridePendingAppTransitionMultiThumbFuture(
+            IAppTransitionAnimationSpecsFuture future, IRemoteCallback animStartedListener,
+            boolean scaleUp) {
+        try {
+            WindowManagerGlobal.getWindowManagerService()
+                    .overridePendingAppTransitionMultiThumbFuture(future, animStartedListener,
+                            scaleUp);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Failed to override transition: " + e);
+        }
+    }
+
     private final class H extends Handler {
         private static final int ON_TASK_STACK_CHANGED = 1;
         private static final int ON_ACTIVITY_PINNED = 2;
         private static final int ON_PINNED_ACTIVITY_RESTART_ATTEMPT = 3;
         private static final int ON_PINNED_STACK_ANIMATION_ENDED = 4;
+        private static final int ON_ACTIVITY_FORCED_RESIZABLE = 5;
 
         @Override
         public void handleMessage(Message msg) {
@@ -1078,6 +1098,13 @@
                     }
                     break;
                 }
+                case ON_ACTIVITY_FORCED_RESIZABLE: {
+                    for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
+                        mTaskStackListeners.get(i).onActivityForcedResizable(
+                                (String) msg.obj, msg.arg1);
+                    }
+                    break;
+                }
             }
         }
     }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/RecentsTransitionHelper.java b/packages/SystemUI/src/com/android/systemui/recents/views/RecentsTransitionHelper.java
index 29da476..7c5b441 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/RecentsTransitionHelper.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/RecentsTransitionHelper.java
@@ -24,6 +24,7 @@
 import android.annotation.Nullable;
 import android.app.ActivityManager.StackId;
 import android.app.ActivityOptions;
+import android.app.ActivityOptions.OnAnimationStartedListener;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
@@ -32,10 +33,8 @@
 import android.os.Handler;
 import android.os.IRemoteCallback;
 import android.os.RemoteException;
-import android.util.Log;
 import android.view.AppTransitionAnimationSpec;
 import android.view.IAppTransitionAnimationSpecsFuture;
-import android.view.WindowManagerGlobal;
 
 import com.android.internal.annotations.GuardedBy;
 import com.android.systemui.recents.Recents;
@@ -52,6 +51,7 @@
 import com.android.systemui.recents.model.TaskStack;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -92,7 +92,7 @@
      */
     public void launchTaskFromRecents(final TaskStack stack, @Nullable final Task task,
             final TaskStackView stackView, final TaskView taskView,
-            final boolean screenPinningRequested, final Rect bounds, int destinationStack) {
+            final boolean screenPinningRequested, final Rect bounds, final int destinationStack) {
         final ActivityOptions opts = ActivityOptions.makeBasic();
         if (bounds != null) {
             opts.setLaunchBounds(bounds.isEmpty() ? null : bounds);
@@ -101,7 +101,12 @@
         final ActivityOptions.OnAnimationStartedListener animStartedListener;
         final IAppTransitionAnimationSpecsFuture transitionFuture;
         if (taskView != null) {
-            transitionFuture = getAppTransitionFuture(task, stackView, destinationStack);
+            transitionFuture = getAppTransitionFuture(new AnimationSpecComposer() {
+                @Override
+                public List<AppTransitionAnimationSpec> composeSpecs() {
+                    return composeAnimationSpecs(task, stackView, destinationStack);
+                }
+            });
             animStartedListener = new ActivityOptions.OnAnimationStartedListener() {
                 @Override
                 public void onAnimationStarted() {
@@ -154,6 +159,23 @@
         }
     }
 
+    public IRemoteCallback wrapStartedListener(final OnAnimationStartedListener listener) {
+        if (listener == null) {
+            return null;
+        }
+        return new IRemoteCallback.Stub() {
+            @Override
+            public void sendResult(Bundle data) throws RemoteException {
+                mHandler.post(new Runnable() {
+                    @Override
+                    public void run() {
+                        listener.onAnimationStarted();
+                    }
+                });
+            }
+        };
+    }
+
     /**
      * Starts the activity for the launch task.
      *
@@ -181,40 +203,21 @@
         }
 
         if (transitionFuture != null) {
-            IRemoteCallback.Stub callback = null;
-            if (animStartedListener != null) {
-                callback = new IRemoteCallback.Stub() {
-                    @Override
-                    public void sendResult(Bundle data) throws RemoteException {
-                        mHandler.post(new Runnable() {
-                            @Override
-                            public void run() {
-                                if (animStartedListener != null) {
-                                    animStartedListener.onAnimationStarted();
-                                }
-                            }
-                        });
-                    }
-                };
-            }
-            try {
-                synchronized (this) {
-                    mAppTransitionAnimationSpecs = SPECS_WAITING;
-                }
-                WindowManagerGlobal.getWindowManagerService()
-                        .overridePendingAppTransitionMultiThumbFuture(transitionFuture,
-                                callback, true /* scaleUp */);
-            } catch (RemoteException e) {
-                Log.w(TAG, "Failed to override transition: " + e);
-            }
+            ssp.overridePendingAppTransitionMultiThumbFuture(transitionFuture,
+                    wrapStartedListener(animStartedListener), true /* scaleUp */);
         }
     }
 
     /**
      * Creates a future which will later be queried for animation specs for this current transition.
+     *
+     * @param composer The implementation that composes the specs on the UI thread.
      */
-    private IAppTransitionAnimationSpecsFuture getAppTransitionFuture(final Task task,
-            final TaskStackView stackView, final int destinationStack) {
+    public IAppTransitionAnimationSpecsFuture getAppTransitionFuture(
+            final AnimationSpecComposer composer) {
+        synchronized (this) {
+            mAppTransitionAnimationSpecs = SPECS_WAITING;
+        }
         return new IAppTransitionAnimationSpecsFuture.Stub() {
             @Override
             public AppTransitionAnimationSpec[] get() throws RemoteException {
@@ -222,8 +225,7 @@
                     @Override
                     public void run() {
                         synchronized (RecentsTransitionHelper.this) {
-                            mAppTransitionAnimationSpecs = composeAnimationSpecs(task, stackView,
-                                    destinationStack);
+                            mAppTransitionAnimationSpecs = composer.composeSpecs();
                             RecentsTransitionHelper.this.notifyAll();
                         }
                     }
@@ -248,6 +250,17 @@
     }
 
     /**
+     * Composes the transition spec when docking a task, which includes a full task bitmap.
+     */
+    public List<AppTransitionAnimationSpec> composeDockAnimationSpec(
+            TaskView taskView, Rect transform) {
+        TaskViewTransform viewTransform = new TaskViewTransform();
+        viewTransform.fillIn(taskView);
+        return Collections.singletonList(new AppTransitionAnimationSpec(taskView.getTask().key.id,
+                RecentsTransitionHelper.composeTaskBitmap(taskView, viewTransform), transform));
+    }
+
+    /**
      * Composes the animation specs for all the tasks in the target stack.
      */
     private List<AppTransitionAnimationSpec> composeAnimationSpecs(final Task task,
@@ -319,6 +332,43 @@
         return new AppTransitionAnimationSpec(task.key.id, null, taskRect);
     }
 
+    public static Bitmap composeTaskBitmap(TaskView taskView, TaskViewTransform transform) {
+        float scale = transform.scale;
+        int fromWidth = (int) (transform.rect.width() * scale);
+        int fromHeight = (int) (transform.rect.height() * scale);
+        Bitmap b = Bitmap.createBitmap(fromWidth, fromHeight,
+                Bitmap.Config.ARGB_8888);
+
+        if (RecentsDebugFlags.Static.EnableTransitionThumbnailDebugMode) {
+            b.eraseColor(0xFFff0000);
+        } else {
+            Canvas c = new Canvas(b);
+            c.scale(scale, scale);
+            taskView.draw(c);
+            c.setBitmap(null);
+        }
+        return b.createAshmemBitmap();
+    }
+
+    private static Bitmap composeHeaderBitmap(TaskView taskView,
+            TaskViewTransform transform) {
+        float scale = transform.scale;
+        int fromHeaderWidth = (int) (transform.rect.width());
+        int fromHeaderHeight = (int) (taskView.mHeaderView.getMeasuredHeight() * scale);
+        Bitmap b = Bitmap.createBitmap(fromHeaderWidth, fromHeaderHeight,
+                Bitmap.Config.ARGB_8888);
+
+        if (RecentsDebugFlags.Static.EnableTransitionThumbnailDebugMode) {
+            b.eraseColor(0xFFff0000);
+        } else {
+            Canvas c = new Canvas(b);
+            c.scale(scale, scale);
+            taskView.mHeaderView.draw(c);
+            c.setBitmap(null);
+        }
+        return b.createAshmemBitmap();
+    }
+
     /**
      * Composes a single animation spec for the given {@link TaskView}
      */
@@ -326,21 +376,7 @@
             TaskView taskView, TaskViewTransform transform, boolean addHeaderBitmap) {
         Bitmap b = null;
         if (addHeaderBitmap) {
-            float scale = transform.scale;
-            int fromHeaderWidth = (int) (transform.rect.width());
-            int fromHeaderHeight = (int) (taskView.mHeaderView.getMeasuredHeight() * scale);
-            b = Bitmap.createBitmap(fromHeaderWidth, fromHeaderHeight,
-                    Bitmap.Config.ARGB_8888);
-
-            if (RecentsDebugFlags.Static.EnableTransitionThumbnailDebugMode) {
-                b.eraseColor(0xFFff0000);
-            } else {
-                Canvas c = new Canvas(b);
-                c.scale(scale, scale);
-                taskView.mHeaderView.draw(c);
-                c.setBitmap(null);
-            }
-            b = b.createAshmemBitmap();
+            b = composeHeaderBitmap(taskView, transform);
         }
 
         Rect taskRect = new Rect();
@@ -351,4 +387,8 @@
         }
         return new AppTransitionAnimationSpec(taskView.getTask().key.id, b, taskRect);
     }
+
+    public interface AnimationSpecComposer {
+        List<AppTransitionAnimationSpec> composeSpecs();
+    }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/RecentsView.java b/packages/SystemUI/src/com/android/systemui/recents/views/RecentsView.java
index 70c4c81..28880df 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/RecentsView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/RecentsView.java
@@ -21,6 +21,7 @@
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
+import android.app.ActivityOptions.OnAnimationStartedListener;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Color;
@@ -28,9 +29,14 @@
 import android.graphics.Rect;
 import android.graphics.drawable.ColorDrawable;
 import android.graphics.drawable.Drawable;
+import android.os.Bundle;
 import android.os.Handler;
+import android.os.IRemoteCallback;
+import android.os.RemoteException;
 import android.util.ArraySet;
 import android.util.AttributeSet;
+import android.view.AppTransitionAnimationSpec;
+import android.view.IAppTransitionAnimationSpecsFuture;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
@@ -38,9 +44,11 @@
 import android.view.ViewOutlineProvider;
 import android.view.ViewPropertyAnimator;
 import android.view.WindowInsets;
+import android.view.WindowManagerGlobal;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 
+import com.android.internal.annotations.GuardedBy;
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.logging.MetricsProto.MetricsEvent;
 import com.android.systemui.Interpolators;
@@ -52,6 +60,7 @@
 import com.android.systemui.recents.RecentsDebugFlags;
 import com.android.systemui.recents.events.EventBus;
 import com.android.systemui.recents.events.activity.DismissRecentsToHomeAnimationStarted;
+import com.android.systemui.recents.events.activity.DockedFirstAnimationFrameEvent;
 import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationCompletedEvent;
 import com.android.systemui.recents.events.activity.HideStackActionButtonEvent;
 import com.android.systemui.recents.events.activity.LaunchTaskEvent;
@@ -68,6 +77,7 @@
 import com.android.systemui.recents.misc.Utilities;
 import com.android.systemui.recents.model.Task;
 import com.android.systemui.recents.model.TaskStack;
+import com.android.systemui.recents.views.RecentsTransitionHelper.AnimationSpecComposer;
 import com.android.systemui.stackdivider.WindowManagerProxy;
 import com.android.systemui.statusbar.FlingAnimationUtils;
 
@@ -484,31 +494,30 @@
             event.taskView.setLeftTopRightBottom(taskViewRect.left, taskViewRect.top,
                     taskViewRect.right, taskViewRect.bottom);
 
-            // Remove the task view after it is docked
-            mTaskStackView.updateLayoutAlgorithm(false /* boundScroll */);
-            stackLayout.getStackTransform(event.task, stackScroller.getStackScroll(), tmpTransform,
-                    null);
-            tmpTransform.alpha = 0;
-            tmpTransform.scale = 1f;
-            tmpTransform.rect.set(taskViewRect);
-            mTaskStackView.updateTaskViewToTransform(event.taskView, tmpTransform,
-                    new AnimationProps(125, Interpolators.ALPHA_OUT,
-                            new AnimatorListenerAdapter() {
-                                @Override
-                                public void onAnimationEnd(Animator animation) {
-                                    // Dock the task and launch it
-                                    SystemServicesProxy ssp = Recents.getSystemServices();
-                                    ssp.startTaskInDockedMode(getContext(), event.taskView,
-                                            event.task.key.id, dockState.createMode);
+            final OnAnimationStartedListener startedListener = new OnAnimationStartedListener() {
+                @Override
+                public void onAnimationStarted() {
+                    EventBus.getDefault().send(new DockedFirstAnimationFrameEvent());
+                    mTaskStackView.getStack().removeTask(event.task, AnimationProps.IMMEDIATE,
+                            true /* fromDockGesture */);
+                }
+            };
 
-                                    // Animate the stack accordingly
-                                    AnimationProps stackAnim = new AnimationProps(
-                                            TaskStackView.DEFAULT_SYNC_STACK_DURATION,
-                                            Interpolators.FAST_OUT_SLOW_IN);
-                                    mTaskStackView.getStack().removeTask(event.task, stackAnim,
-                                            true /* fromDockGesture */);
-                                }
-                            }));
+            // Dock the task and launch it
+            SystemServicesProxy ssp = Recents.getSystemServices();
+            ssp.startTaskInDockedMode(event.task.key.id, dockState.createMode);
+            final Rect taskRect = getTaskRect(event.taskView);
+            IAppTransitionAnimationSpecsFuture future = mTransitionHelper.getAppTransitionFuture(
+                    new AnimationSpecComposer() {
+                        @Override
+                        public List<AppTransitionAnimationSpec> composeSpecs() {
+                            return mTransitionHelper.composeDockAnimationSpec(
+                                    event.taskView, taskRect);
+                        }
+                    });
+            ssp.overridePendingAppTransitionMultiThumbFuture(future,
+                    mTransitionHelper.wrapStartedListener(startedListener),
+                    true /* scaleUp */);
 
             MetricsLogger.action(mContext, MetricsEvent.ACTION_WINDOW_DOCK_DRAG_DROP);
         } else {
@@ -518,6 +527,15 @@
         }
     }
 
+    private Rect getTaskRect(TaskView taskView) {
+        int[] location = taskView.getLocationOnScreen();
+        int viewX = location[0];
+        int viewY = location[1];
+        return new Rect(viewX, viewY,
+                (int) (viewX + taskView.getWidth() * taskView.getScaleX()),
+                (int) (viewY + taskView.getHeight() * taskView.getScaleY()));
+    }
+
     public final void onBusEvent(DraggingInRecentsEvent event) {
         if (mTaskStackView.getTaskViews().size() > 0) {
             setTranslationY(event.distanceFromTop - mTaskStackView.getTaskViews().get(0).getY());
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
index c9cc1e9..bea47f1 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
@@ -109,7 +109,7 @@
 
     public static final int DEFAULT_SYNC_STACK_DURATION = 200;
     private static final int DRAG_SCALE_DURATION = 175;
-    private static final float DRAG_SCALE_FACTOR = 1.05f;
+    static final float DRAG_SCALE_FACTOR = 1.05f;
 
     private static final int LAUNCH_NEXT_SCROLL_BASE_DURATION = 216;
     private static final int LAUNCH_NEXT_SCROLL_INCR_DURATION = 32;
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java b/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java
index dd59fac..e8cf126 100644
--- a/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java
@@ -41,6 +41,7 @@
     private DockDividerVisibilityListener mDockDividerVisibilityListener;
     private boolean mVisible = false;
     private boolean mMinimized = false;
+    private ForcedResizableInfoActivityController mForcedResizableController;
 
     @Override
     public void start() {
@@ -52,6 +53,7 @@
         mDockDividerVisibilityListener = new DockDividerVisibilityListener();
         SystemServicesProxy ssp = Recents.getSystemServices();
         ssp.registerDockedStackListener(mDockDividerVisibilityListener);
+        mForcedResizableController = new ForcedResizableInfoActivityController(mContext);
     }
 
     @Override
@@ -117,6 +119,15 @@
         });
     }
 
+    private void notifyDockedStackExistsChanged(final boolean exists) {
+        mView.post(new Runnable() {
+            @Override
+            public void run() {
+                mForcedResizableController.notifyDockedStackExistsChanged(exists);
+            }
+        });
+    }
+
     class DockDividerVisibilityListener extends IDockedStackListener.Stub {
 
         @Override
@@ -126,6 +137,7 @@
 
         @Override
         public void onDockedStackExistsChanged(boolean exists) throws RemoteException {
+            notifyDockedStackExistsChanged(exists);
         }
 
         @Override
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java
index 132c09f..bab6baa 100644
--- a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java
@@ -66,6 +66,8 @@
 import com.android.systemui.recents.events.activity.UndockingTaskEvent;
 import com.android.systemui.recents.events.ui.RecentsDrawnEvent;
 import com.android.systemui.recents.misc.SystemServicesProxy;
+import com.android.systemui.stackdivider.events.StartedDragingEvent;
+import com.android.systemui.stackdivider.events.StoppedDragingEvent;
 import com.android.systemui.statusbar.FlingAnimationUtils;
 import com.android.systemui.statusbar.phone.NavigationBarGestureHelper;
 
@@ -281,6 +283,7 @@
             mWindowManager.setSlippery(false);
             liftBackground();
         }
+        EventBus.getDefault().send(new StartedDragingEvent());
         return mDockSide != WindowManager.DOCKED_INVALID;
     }
 
@@ -439,6 +442,7 @@
                 mDockSide = WindowManager.DOCKED_INVALID;
                 mCurrentAnimator = null;
                 mEntranceAnimationRunning = false;
+                EventBus.getDefault().send(new StoppedDragingEvent());
             }
         });
         mCurrentAnimator = anim;
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/ForcedResizableInfoActivity.java b/packages/SystemUI/src/com/android/systemui/stackdivider/ForcedResizableInfoActivity.java
new file mode 100644
index 0000000..f728dab
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/ForcedResizableInfoActivity.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2016 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.systemui.stackdivider;
+
+import android.annotation.Nullable;
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnTouchListener;
+
+import com.android.systemui.R;
+
+/**
+ * Translucent activity that gets started on top of a task in multi-window to inform the user that
+ * we forced the activity below to be resizable.
+ */
+public class ForcedResizableInfoActivity extends Activity implements OnTouchListener {
+
+    private static final long DISMISS_DELAY = 2500;
+
+    private final Runnable mFinishRunnable = new Runnable() {
+        @Override
+        public void run() {
+            finish();
+        }
+    };
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.forced_resizable_activity);
+        getWindow().getDecorView().setOnTouchListener(this);
+    }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+        getWindow().getDecorView().postDelayed(mFinishRunnable, DISMISS_DELAY);
+    }
+
+    @Override
+    protected void onStop() {
+        super.onStop();
+        finish();
+    }
+
+    @Override
+    public boolean onTouch(View v, MotionEvent event) {
+        finish();
+        return true;
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        finish();
+        return true;
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/ForcedResizableInfoActivityController.java b/packages/SystemUI/src/com/android/systemui/stackdivider/ForcedResizableInfoActivityController.java
new file mode 100644
index 0000000..9b56037
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/ForcedResizableInfoActivityController.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2016 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.systemui.stackdivider;
+
+import android.app.ActivityOptions;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Handler;
+import android.util.ArrayMap;
+import android.util.ArraySet;
+
+import com.android.systemui.recents.events.EventBus;
+import com.android.systemui.recents.events.activity.AppTransitionFinishedEvent;
+import com.android.systemui.recents.events.activity.ForcedResizableEvent;
+import com.android.systemui.stackdivider.events.StartedDragingEvent;
+import com.android.systemui.stackdivider.events.StoppedDragingEvent;
+
+/**
+ * Controller that decides when to show the {@link ForcedResizableInfoActivity}.
+ */
+public class ForcedResizableInfoActivityController {
+
+    private static final String SELF_PACKAGE_NAME = "com.android.systemui";
+
+    private static final int TIMEOUT = 1000;
+    private final Context mContext;
+    private final Handler mHandler = new Handler();
+    private final ArraySet<Integer> mPendingTaskIds = new ArraySet<>();
+    private final ArraySet<String> mPackagesShownInSession = new ArraySet<>();
+    private boolean mDividerDraging;
+
+    private final Runnable mTimeoutRunnable = new Runnable() {
+        @Override
+        public void run() {
+            showPending();
+        }
+    };
+
+    public ForcedResizableInfoActivityController(Context context) {
+        mContext = context;
+        EventBus.getDefault().register(this);
+    }
+
+    public void notifyDockedStackExistsChanged(boolean exists) {
+        if (!exists) {
+            mPackagesShownInSession.clear();
+        }
+    }
+
+    public final void onBusEvent(ForcedResizableEvent forcedResizableEvent) {
+        if (debounce(forcedResizableEvent.packageName)) {
+            return;
+        }
+        mPendingTaskIds.add(forcedResizableEvent.taskId);
+        postTimeout();
+    }
+
+    public final void onBusEvent(AppTransitionFinishedEvent event) {
+        if (!mDividerDraging) {
+            showPending();
+        }
+    }
+
+    public final void onBusEvent(StartedDragingEvent event) {
+        mDividerDraging = true;
+        mHandler.removeCallbacks(mTimeoutRunnable);
+    }
+
+    public final void onBusEvent(StoppedDragingEvent event) {
+        mDividerDraging = false;
+        showPending();
+    }
+
+    private void showPending() {
+        mHandler.removeCallbacks(mTimeoutRunnable);
+        for (int i = mPendingTaskIds.size() - 1; i >= 0; i--) {
+            Intent intent = new Intent(mContext, ForcedResizableInfoActivity.class);
+            ActivityOptions options = ActivityOptions.makeBasic();
+            options.setLaunchTaskId(mPendingTaskIds.valueAt(i));
+            mContext.startActivity(intent, options.toBundle());
+        }
+        mPendingTaskIds.clear();
+    }
+
+    private void postTimeout() {
+        mHandler.removeCallbacks(mTimeoutRunnable);
+        mHandler.postDelayed(mTimeoutRunnable, TIMEOUT);
+    }
+
+    private boolean debounce(String packageName) {
+        if (packageName == null) {
+            return false;
+        }
+
+        // We launch ForcedResizableInfoActivity into a task that was forced resizable, so that
+        // triggers another notification. So ignore our own activity.
+        if (SELF_PACKAGE_NAME.equals(packageName)) {
+            return true;
+        }
+        boolean debounce = mPackagesShownInSession.contains(packageName);
+        mPackagesShownInSession.add(packageName);
+        return debounce;
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/events/StartedDragingEvent.java b/packages/SystemUI/src/com/android/systemui/stackdivider/events/StartedDragingEvent.java
new file mode 100644
index 0000000..5d19851
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/events/StartedDragingEvent.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 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.systemui.stackdivider.events;
+
+import com.android.systemui.recents.events.EventBus;
+
+/**
+ * Sent when the divider is being draged either manually or by an animation.
+ */
+public class StartedDragingEvent extends EventBus.Event {
+}
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/events/StoppedDragingEvent.java b/packages/SystemUI/src/com/android/systemui/stackdivider/events/StoppedDragingEvent.java
new file mode 100644
index 0000000..c50d6d6
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/events/StoppedDragingEvent.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 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.systemui.stackdivider.events;
+
+import com.android.systemui.recents.events.EventBus;
+
+/**
+ * Sent when the divider isn't draging anymore.
+ */
+public class StoppedDragingEvent extends EventBus.Event {
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java b/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
index 0ffab5b..d00e8ef 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java
@@ -73,6 +73,7 @@
     private static final int MSG_REMOVE_QS_TILE                = 28 << MSG_SHIFT;
     private static final int MSG_CLICK_QS_TILE                 = 29 << MSG_SHIFT;
     private static final int MSG_TOGGLE_APP_SPLIT_SCREEN       = 30 << MSG_SHIFT;
+    private static final int MSG_APP_TRANSITION_FINISHED       = 31 << MSG_SHIFT;
 
     public static final int FLAG_EXCLUDE_NONE = 0;
     public static final int FLAG_EXCLUDE_SEARCH_PANEL = 1 << 0;
@@ -117,6 +118,7 @@
         public void appTransitionPending();
         public void appTransitionCancelled();
         public void appTransitionStarting(long startTime, long duration);
+        public void appTransitionFinished();
         public void showAssistDisclosure();
         public void startAssist(Bundle args);
         public void onCameraLaunchGestureDetected(int source);
@@ -324,6 +326,14 @@
         }
     }
 
+    @Override
+    public void appTransitionFinished() {
+        synchronized (mLock) {
+            mHandler.removeMessages(MSG_APP_TRANSITION_FINISHED);
+            mHandler.sendEmptyMessage(MSG_APP_TRANSITION_FINISHED);
+        }
+    }
+
     public void showAssistDisclosure() {
         synchronized (mLock) {
             mHandler.removeMessages(MSG_ASSIST_DISCLOSURE);
@@ -452,6 +462,9 @@
                     Pair<Long, Long> data = (Pair<Long, Long>) msg.obj;
                     mCallbacks.appTransitionStarting(data.first, data.second);
                     break;
+                case MSG_APP_TRANSITION_FINISHED:
+                    mCallbacks.appTransitionFinished();
+                    break;
                 case MSG_ASSIST_DISCLOSURE:
                     mCallbacks.showAssistDisclosure();
                     break;
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/car/CarStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/car/CarStatusBar.java
index 726aed3..4add3cb 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/car/CarStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/car/CarStatusBar.java
@@ -24,6 +24,7 @@
 import android.graphics.PixelFormat;
 import android.os.Handler;
 import android.os.Looper;
+import android.os.RemoteException;
 import android.view.View;
 import android.view.ViewGroup.LayoutParams;
 import android.view.ViewStub;
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index 9b1f338..7ae87e7 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -120,6 +120,7 @@
 import com.android.systemui.qs.QSPanel;
 import com.android.systemui.recents.ScreenPinningRequest;
 import com.android.systemui.recents.events.EventBus;
+import com.android.systemui.recents.events.activity.AppTransitionFinishedEvent;
 import com.android.systemui.recents.events.activity.UndockingTaskEvent;
 import com.android.systemui.stackdivider.Divider;
 import com.android.systemui.stackdivider.WindowManagerProxy;
@@ -4310,6 +4311,7 @@
     @Override
     public void appTransitionCancelled() {
         mIconController.appTransitionCancelled();
+        EventBus.getDefault().send(new AppTransitionFinishedEvent());
     }
 
     @Override
@@ -4326,6 +4328,11 @@
     }
 
     @Override
+    public void appTransitionFinished() {
+        EventBus.getDefault().send(new AppTransitionFinishedEvent());
+    }
+
+    @Override
     public void onCameraLaunchGestureDetected(int source) {
         mLastCameraLaunchSource = source;
         if (mStartedGoingToSleep) {
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java
index 2524e1a..f9bb5e3 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/tv/TvStatusBar.java
@@ -171,6 +171,10 @@
     }
 
     @Override
+    public void appTransitionFinished() {
+    }
+
+    @Override
     public void onCameraLaunchGestureDetected(int source) {
     }
 
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 1abb5ff..3d13715 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -55,7 +55,6 @@
 import com.android.server.pm.Installer;
 import com.android.server.statusbar.StatusBarManagerInternal;
 import com.android.server.vr.VrManagerInternal;
-import com.android.server.wm.AppTransition;
 import com.android.server.wm.WindowManagerService;
 
 import org.xmlpull.v1.XmlPullParser;
@@ -103,7 +102,6 @@
 import android.app.ProfilerInfo;
 import android.app.admin.DevicePolicyManager;
 import android.app.admin.DevicePolicyManagerInternal;
-import android.app.admin.IDevicePolicyManager;
 import android.app.assist.AssistContent;
 import android.app.assist.AssistStructure;
 import android.app.backup.IBackupManager;
@@ -355,6 +353,7 @@
 import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_PINNABLE;
 import static com.android.server.wm.AppTransition.TRANSIT_ACTIVITY_OPEN;
 import static com.android.server.wm.AppTransition.TRANSIT_ACTIVITY_RELAUNCH;
+import static com.android.server.wm.AppTransition.TRANSIT_DOCK_TASK_FROM_RECENTS;
 import static com.android.server.wm.AppTransition.TRANSIT_TASK_IN_PLACE;
 import static com.android.server.wm.AppTransition.TRANSIT_TASK_OPEN;
 import static com.android.server.wm.AppTransition.TRANSIT_TASK_TO_FRONT;
@@ -1471,6 +1470,7 @@
     static final int NOTIFY_ACTIVITY_PINNED_LISTENERS_MSG = 64;
     static final int NOTIFY_PINNED_ACTIVITY_RESTART_ATTEMPT_LISTENERS_MSG = 65;
     static final int NOTIFY_PINNED_STACK_ANIMATION_ENDED_LISTENERS_MSG = 66;
+    static final int NOTIFY_FORCED_RESIZABLE_MSG = 67;
 
     static final int FIRST_ACTIVITY_STACK_MSG = 100;
     static final int FIRST_BROADCAST_QUEUE_MSG = 200;
@@ -2019,6 +2019,21 @@
                 }
                 break;
             }
+            case NOTIFY_FORCED_RESIZABLE_MSG: {
+                synchronized (ActivityManagerService.this) {
+                    for (int i = mTaskStackListeners.beginBroadcast() - 1; i >= 0; i--) {
+                        try {
+                            // Make a one-way callback to the listener
+                            mTaskStackListeners.getBroadcastItem(i).onActivityForcedResizable(
+                                    (String) msg.obj, msg.arg1);
+                        } catch (RemoteException e){
+                            // Handled by the RemoteCallbackList
+                        }
+                    }
+                    mTaskStackListeners.finishBroadcast();
+                }
+                break;
+            }
             case NOTIFY_CLEARTEXT_NETWORK_MSG: {
                 final int uid = msg.arg1;
                 final byte[] firstPacket = (byte[]) msg.obj;
@@ -4479,63 +4494,14 @@
         }
         final long origId = Binder.clearCallingIdentity();
         try {
-            return startActivityFromRecentsInner(taskId, bOptions);
+            synchronized (this) {
+                return mStackSupervisor.startActivityFromRecentsInner(taskId, bOptions);
+            }
         } finally {
             Binder.restoreCallingIdentity(origId);
         }
     }
 
-    final int startActivityFromRecentsInner(int taskId, Bundle bOptions) {
-        final TaskRecord task;
-        final int callingUid;
-        final String callingPackage;
-        final Intent intent;
-        final int userId;
-        synchronized (this) {
-            final ActivityOptions activityOptions = (bOptions != null)
-                    ? new ActivityOptions(bOptions) : null;
-            final int launchStackId = (activityOptions != null)
-                    ? activityOptions.getLaunchStackId() : INVALID_STACK_ID;
-
-            if (launchStackId == HOME_STACK_ID) {
-                throw new IllegalArgumentException("startActivityFromRecentsInner: Task "
-                        + taskId + " can't be launch in the home stack.");
-            }
-            task = mStackSupervisor.anyTaskForIdLocked(taskId, RESTORE_FROM_RECENTS, launchStackId);
-            if (task == null) {
-                throw new IllegalArgumentException(
-                        "startActivityFromRecentsInner: Task " + taskId + " not found.");
-            }
-
-            if (launchStackId != INVALID_STACK_ID) {
-                if (launchStackId == DOCKED_STACK_ID && activityOptions != null) {
-                    mWindowManager.setDockedStackCreateState(
-                            activityOptions.getDockCreateMode(), null /* initialBounds */);
-                }
-                if (task.stack.mStackId != launchStackId) {
-                    mStackSupervisor.moveTaskToStackLocked(
-                            taskId, launchStackId, ON_TOP, FORCE_FOCUS, "startActivityFromRecents",
-                            ANIMATE);
-                }
-            }
-
-            // If the user must confirm credentials (e.g. when first launching a work app and the
-            // Work Challenge is present) let startActivityInPackage handle the intercepting.
-            if (!mUserController.shouldConfirmCredentials(task.userId)
-                    && task.getRootActivity() != null) {
-                moveTaskToFrontLocked(task.taskId, 0, bOptions);
-                return ActivityManager.START_TASK_TO_FRONT;
-            }
-            callingUid = task.mCallingUid;
-            callingPackage = task.mCallingPackage;
-            intent = task.intent;
-            intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);
-            userId = task.userId;
-        }
-        return startActivityInPackage(callingUid, callingPackage, intent, null, null, null, 0, 0,
-                bOptions, userId, null, task);
-    }
-
     final int startActivityInPackage(int uid, String callingPackage,
             Intent intent, String resolvedType, IBinder resultTo,
             String resultWho, int requestCode, int startFlags, Bundle bOptions, int userId,
@@ -11426,10 +11392,12 @@
                     // Get the focused task before launching launcher.
 
                     if (mUserController.isLockScreenDisabled(currentUserId)) {
+
                         // If there is no device lock, we will show the profile's credential page.
                         // startActivityFromRecentsInner is intercepted and will forward user to it.
                         if (mFocusedActivity != null) {
-                            startActivityFromRecentsInner(mFocusedActivity.task.taskId, null);
+                            mStackSupervisor.startActivityFromRecentsInner(
+                                    mFocusedActivity.task.taskId, null);
                         }
                     } else {
                         // Showing launcher to avoid user entering credential twice.
@@ -21033,6 +21001,20 @@
                 mStackSupervisor.mActivityMetricsLogger.notifyTransitionStarting(reason);
             }
         }
+
+        @Override
+        public void notifyAppTransitionFinished() {
+            synchronized (ActivityManagerService.this) {
+                mStackSupervisor.notifyAppTransitionDone();
+            }
+        }
+
+        @Override
+        public void notifyAppTransitionCancelled() {
+            synchronized (ActivityManagerService.this) {
+                mStackSupervisor.notifyAppTransitionDone();
+            }
+        }
     }
 
     private final class SleepTokenImpl extends SleepToken {
@@ -21121,7 +21103,9 @@
             // Will bring task to front if it already has a root activity.
             final long origId = Binder.clearCallingIdentity();
             try {
-                startActivityFromRecentsInner(mTaskId, null);
+                synchronized (this) {
+                    mStackSupervisor.startActivityFromRecentsInner(mTaskId, null);
+                }
             } finally {
                 Binder.restoreCallingIdentity(origId);
             }
diff --git a/services/core/java/com/android/server/am/ActivityStack.java b/services/core/java/com/android/server/am/ActivityStack.java
index 5cb04c8..ee406da 100644
--- a/services/core/java/com/android/server/am/ActivityStack.java
+++ b/services/core/java/com/android/server/am/ActivityStack.java
@@ -258,6 +258,12 @@
     // Current bounds of the stack or null if fullscreen.
     Rect mBounds = null;
 
+    boolean mUpdateBoundsDeferred;
+    boolean mUpdateBoundsDeferredCalled;
+    final Rect mDeferredBounds = new Rect();
+    final Rect mDeferredTaskBounds = new Rect();
+    final Rect mDeferredTaskInsetBounds = new Rect();
+
     long mLaunchStartTime = 0;
     long mFullyDrawnStartTime = 0;
 
@@ -427,6 +433,57 @@
         mActivityContainer.mActivityDisplay.mDisplay.getSize(out);
     }
 
+    /**
+     * Defers updating the bounds of the stack. If the stack was resized/repositioned while
+     * deferring, the bounds will update in {@link #continueUpdateBounds()}.
+     */
+    void deferUpdateBounds() {
+        if (!mUpdateBoundsDeferred) {
+            mUpdateBoundsDeferred = true;
+            mUpdateBoundsDeferredCalled = false;
+        }
+    }
+
+    /**
+     * Continues updating bounds after updates have been deferred. If there was a resize attempt
+     * between {@link #deferUpdateBounds()} and {@link #continueUpdateBounds()}, the stack will
+     * be resized to that bounds.
+     */
+    void continueUpdateBounds() {
+        final boolean wasDeferred = mUpdateBoundsDeferred;
+        mUpdateBoundsDeferred = false;
+        if (wasDeferred && mUpdateBoundsDeferredCalled) {
+            mStackSupervisor.resizeStackUncheckedLocked(this,
+                    mDeferredBounds.isEmpty() ? null : mDeferredBounds,
+                    mDeferredTaskBounds.isEmpty() ? null : mDeferredTaskBounds,
+                    mDeferredTaskInsetBounds.isEmpty() ? null : mDeferredTaskInsetBounds);
+        }
+    }
+
+    boolean updateBoundsAllowed(Rect bounds, Rect tempTaskBounds,
+            Rect tempTaskInsetBounds) {
+        if (!mUpdateBoundsDeferred) {
+            return true;
+        }
+        if (bounds != null) {
+            mDeferredBounds.set(bounds);
+        } else {
+            mDeferredBounds.setEmpty();
+        }
+        if (tempTaskBounds != null) {
+            mDeferredTaskBounds.set(tempTaskBounds);
+        } else {
+            mDeferredTaskBounds.setEmpty();
+        }
+        if (tempTaskInsetBounds != null) {
+            mDeferredTaskInsetBounds.set(tempTaskInsetBounds);
+        } else {
+            mDeferredTaskInsetBounds.setEmpty();
+        }
+        mUpdateBoundsDeferredCalled = true;
+        return false;
+    }
+
     void setBounds(Rect bounds) {
         mBounds = mFullscreen ? null : new Rect(bounds);
         if (mTaskPositioner != null) {
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index 7def1bd..0e6d174 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -52,6 +52,7 @@
 import android.hardware.input.InputManager;
 import android.hardware.input.InputManagerInternal;
 import android.os.Binder;
+import android.os.Bundle;
 import android.os.Debug;
 import android.os.Handler;
 import android.os.IBinder;
@@ -101,7 +102,9 @@
 import java.util.Objects;
 import java.util.Set;
 
+import static android.Manifest.permission.MANAGE_ACTIVITY_STACKS;
 import static android.Manifest.permission.START_ANY_ACTIVITY;
+import static android.Manifest.permission.START_TASKS_FROM_RECENTS;
 import static android.app.ActivityManager.LOCK_TASK_MODE_LOCKED;
 import static android.app.ActivityManager.LOCK_TASK_MODE_NONE;
 import static android.app.ActivityManager.LOCK_TASK_MODE_PINNED;
@@ -120,7 +123,6 @@
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.content.pm.ActivityInfo.FLAG_SHOW_FOR_ALL_USERS;
 import static android.content.pm.ActivityInfo.RESIZE_MODE_FORCE_RESIZEABLE;
-import static android.content.pm.ActivityInfo.RESIZE_MODE_UNRESIZEABLE;
 import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.os.Trace.TRACE_TAG_ACTIVITY_MANAGER;
 import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_ALL;
@@ -151,6 +153,7 @@
 import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
 import static com.android.server.am.ActivityManagerService.ANIMATE;
 import static com.android.server.am.ActivityManagerService.FIRST_SUPERVISOR_STACK_MSG;
+import static com.android.server.am.ActivityManagerService.NOTIFY_FORCED_RESIZABLE_MSG;
 import static com.android.server.am.ActivityRecord.APPLICATION_ACTIVITY_TYPE;
 import static com.android.server.am.ActivityRecord.HOME_ACTIVITY_TYPE;
 import static com.android.server.am.ActivityRecord.RECENTS_ACTIVITY_TYPE;
@@ -167,6 +170,7 @@
 import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_LAUNCHABLE_PRIV;
 import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_PINNABLE;
 import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_WHITELISTED;
+import static com.android.server.wm.AppTransition.TRANSIT_DOCK_TASK_FROM_RECENTS;
 
 public final class ActivityStackSupervisor implements DisplayListener {
     private static final String TAG = TAG_WITH_CLASS_NAME ? "ActivityStackSupervisor" : TAG_AM;
@@ -423,6 +427,11 @@
     boolean mAppVisibilitiesChangedSinceLastPause;
 
     /**
+     * Set of tasks that are in resizing mode during an app transition to fill the "void".
+     */
+    private final ArraySet<Integer> mResizingTasksDuringAnimation = new ArraySet<>();
+
+    /**
      * Description of a request to start a new activity, which has been held
      * due to app switches being disabled.
      */
@@ -1304,7 +1313,7 @@
     boolean checkStartAnyActivityPermission(Intent intent, ActivityInfo aInfo,
             String resultWho, int requestCode, int callingPid, int callingUid,
             String callingPackage, boolean ignoreTargetSecurity, ProcessRecord callerApp,
-            ActivityRecord resultRecord, ActivityStack resultStack) {
+            ActivityRecord resultRecord, ActivityStack resultStack, ActivityOptions options) {
         final int startAnyPerm = mService.checkPermission(START_ANY_ACTIVITY, callingPid,
                 callingUid);
         if (startAnyPerm ==  PERMISSION_GRANTED) {
@@ -1358,6 +1367,19 @@
             Slog.w(TAG, message);
             return false;
         }
+        if (options != null && options.getLaunchTaskId() != -1) {
+            final int startInTaskPerm = mService.checkPermission(START_TASKS_FROM_RECENTS,
+                    callingPid, callingUid);
+            if (startInTaskPerm != PERMISSION_GRANTED) {
+                final String msg = "Permission Denial: starting " + intent.toString()
+                        + " from " + callerApp + " (pid=" + callingPid
+                        + ", uid=" + callingUid + ") with launchTaskId="
+                        + options.getLaunchTaskId();
+                Slog.w(TAG, msg);
+                throw new SecurityException(msg);
+            }
+        }
+
         return true;
     }
 
@@ -1788,6 +1810,8 @@
 
         if (DEBUG_STACK) Slog.d(TAG_STACK,
                 "findTaskToMoveToFront: moved to front of stack=" + task.stack);
+
+        showNonResizeableDockToastIfNeeded(task, INVALID_STACK_ID, task.stack.mStackId);
     }
 
     boolean canUseActivityOptionsLaunchBounds(ActivityOptions options, int launchStackId) {
@@ -1924,10 +1948,39 @@
         }
     }
 
-    private void resizeStackUncheckedLocked(ActivityStack stack, Rect bounds, Rect tempTaskBounds,
+    void deferUpdateBounds(int stackId) {
+        final ActivityStack stack = getStack(stackId);
+        if (stack != null) {
+            stack.deferUpdateBounds();
+        }
+    }
+
+    void continueUpdateBounds(int stackId) {
+        final ActivityStack stack = getStack(stackId);
+        if (stack != null) {
+            stack.continueUpdateBounds();
+        }
+    }
+
+    void notifyAppTransitionDone() {
+        continueUpdateBounds(HOME_STACK_ID);
+        for (int i = mResizingTasksDuringAnimation.size() - 1; i >= 0; i--) {
+            final int taskId = mResizingTasksDuringAnimation.valueAt(i);
+            if (anyTaskForIdLocked(taskId) != null) {
+                mWindowManager.setTaskDockedResizing(taskId, false);
+            }
+        }
+        mResizingTasksDuringAnimation.clear();
+    }
+
+    void resizeStackUncheckedLocked(ActivityStack stack, Rect bounds, Rect tempTaskBounds,
             Rect tempTaskInsetBounds) {
         bounds = TaskRecord.validateBounds(bounds);
 
+        if (!stack.updateBoundsAllowed(bounds, tempTaskBounds, tempTaskInsetBounds)) {
+            return;
+        }
+
         mTmpBounds.clear();
         mTmpConfigs.clear();
         mTmpInsetBounds.clear();
@@ -3309,10 +3362,14 @@
             return;
         }
 
-        if (!task.canGoInDockedStack() || task.mResizeMode == RESIZE_MODE_FORCE_RESIZEABLE) {
-            // Display warning toast if we tried to put a non-dockable task in the docked stack or
-            // the task was forced to be resizable by the system.
+        if (!task.canGoInDockedStack()) {
+            // Display a warning toast that we tried to put a non-dockable task in the docked stack.
             mWindowManager.scheduleShowNonResizeableDockToast(task.taskId);
+        } else if (task.mResizeMode == RESIZE_MODE_FORCE_RESIZEABLE) {
+            String packageName = task.getTopActivity() != null
+                    ? task.getTopActivity().appInfo.packageName : null;
+            mService.mHandler.obtainMessage(NOTIFY_FORCED_RESIZABLE_MSG, task.taskId, 0,
+                    packageName).sendToTarget();
         }
     }
 
@@ -4129,4 +4186,80 @@
         throw new IllegalStateException("Failed to find a stack behind stack=" + stack
                 + " in=" + stacks);
     }
+
+    /**
+     * Puts a task into resizing mode during the next app transition.
+     *
+     * @param taskId the id of the task to put into resizing mode
+     */
+    private void setResizingDuringAnimation(int taskId) {
+        mResizingTasksDuringAnimation.add(taskId);
+        mWindowManager.setTaskDockedResizing(taskId, true);
+    }
+
+    final int startActivityFromRecentsInner(int taskId, Bundle bOptions) {
+        final TaskRecord task;
+        final int callingUid;
+        final String callingPackage;
+        final Intent intent;
+        final int userId;
+        final ActivityOptions activityOptions = (bOptions != null)
+                ? new ActivityOptions(bOptions) : null;
+        final int launchStackId = (activityOptions != null)
+                ? activityOptions.getLaunchStackId() : INVALID_STACK_ID;
+
+        if (launchStackId == HOME_STACK_ID) {
+            throw new IllegalArgumentException("startActivityFromRecentsInner: Task "
+                    + taskId + " can't be launch in the home stack.");
+        }
+        task = anyTaskForIdLocked(taskId, RESTORE_FROM_RECENTS, launchStackId);
+        if (task == null) {
+            throw new IllegalArgumentException(
+                    "startActivityFromRecentsInner: Task " + taskId + " not found.");
+        }
+
+        if (launchStackId != INVALID_STACK_ID) {
+            if (launchStackId == DOCKED_STACK_ID) {
+                mWindowManager.setDockedStackCreateState(
+                        activityOptions.getDockCreateMode(), null /* initialBounds */);
+
+                // Defer updating the stack in which recents is until the app transition is done, to
+                // not run into issues where we still need to draw the task in recents but the
+                // docked stack is already created.
+                deferUpdateBounds(HOME_STACK_ID);
+                mWindowManager.prepareAppTransition(TRANSIT_DOCK_TASK_FROM_RECENTS, false);
+            }
+            if (task.stack.mStackId != launchStackId) {
+                moveTaskToStackLocked(
+                        taskId, launchStackId, ON_TOP, FORCE_FOCUS, "startActivityFromRecents",
+                        ANIMATE);
+            }
+        }
+
+        // If the user must confirm credentials (e.g. when first launching a work app and the
+        // Work Challenge is present) let startActivityInPackage handle the intercepting.
+        if (!mService.mUserController.shouldConfirmCredentials(task.userId)
+                && task.getRootActivity() != null) {
+            mService.moveTaskToFrontLocked(task.taskId, 0, bOptions);
+
+            // If we are launching the task in the docked stack, put it into resizing mode so
+            // the window renders full-screen with the background filling the void. Also only
+            // call this at the end to make sure that tasks exists on the window manager side.
+            if (launchStackId == DOCKED_STACK_ID) {
+                setResizingDuringAnimation(taskId);
+            }
+            return ActivityManager.START_TASK_TO_FRONT;
+        }
+        callingUid = task.mCallingUid;
+        callingPackage = task.mCallingPackage;
+        intent = task.intent;
+        intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY);
+        userId = task.userId;
+            int result = mService.startActivityInPackage(callingUid, callingPackage, intent, null,
+                    null, null, 0, 0, bOptions, userId, null, task);
+            if (launchStackId == DOCKED_STACK_ID) {
+                setResizingDuringAnimation(task.taskId);
+            }
+            return result;
+    }
 }
diff --git a/services/core/java/com/android/server/am/ActivityStarter.java b/services/core/java/com/android/server/am/ActivityStarter.java
index af69c93..7be9f9d 100644
--- a/services/core/java/com/android/server/am/ActivityStarter.java
+++ b/services/core/java/com/android/server/am/ActivityStarter.java
@@ -362,7 +362,7 @@
 
         boolean abort = !mSupervisor.checkStartAnyActivityPermission(intent, aInfo, resultWho,
                 requestCode, callingPid, callingUid, callingPackage, ignoreTargetSecurity, callerApp,
-                resultRecord, resultStack);
+                resultRecord, resultStack, options);
         abort |= !mService.mIntentFirewall.checkStartActivity(intent, callingUid,
                 callingPid, resolvedType, aInfo.applicationInfo);
 
@@ -547,12 +547,18 @@
         }
 
         if (startedActivityStackId == DOCKED_STACK_ID && prevFocusedStackId == HOME_STACK_ID) {
-            // We launch an activity while being in home stack, which means either launcher or
-            // recents into docked stack. We don't want the launched activity to be alone in a
-            // docked stack, so we want to immediately launch recents too.
-            if (DEBUG_RECENTS) Slog.d(TAG, "Scheduling recents launch.");
-            mWindowManager.showRecentApps();
-            return;
+            final ActivityStack homeStack = mSupervisor.getStack(HOME_STACK_ID);
+            final ActivityRecord topActivityHomeStack = homeStack != null
+                    ? homeStack.topRunningActivityLocked() : null;
+            if (topActivityHomeStack == null
+                    || topActivityHomeStack.mActivityType != RECENTS_ACTIVITY_TYPE) {
+                // We launch an activity while being in home stack, which means either launcher or
+                // recents into docked stack. We don't want the launched activity to be alone in a
+                // docked stack, so we want to immediately launch recents too.
+                if (DEBUG_RECENTS) Slog.d(TAG, "Scheduling recents launch.");
+                mWindowManager.showRecentApps();
+                return;
+            }
         }
 
         if (startedActivityStackId == PINNED_STACK_ID
@@ -879,6 +885,9 @@
 
         ActivityRecord intentActivity = getReusableIntentActivity();
 
+        final int preferredLaunchStackId =
+                (mOptions != null) ? mOptions.getLaunchStackId() : INVALID_STACK_ID;
+
         if (intentActivity != null) {
             // When the flags NEW_TASK and CLEAR_TASK are set, then the task gets reused but
             // still needs to be a lock task mode violation since the task gets cleared out and
@@ -938,6 +947,8 @@
                 // We didn't do anything...  but it was needed (a.k.a., client don't use that
                 // intent!)  And for paranoia, make sure we have correctly resumed the top activity.
                 resumeTargetStackIfNeeded();
+                mSupervisor.showNonResizeableDockToastIfNeeded(mStartActivity.task,
+                        preferredLaunchStackId, mTargetStack.mStackId);
                 return START_TASK_TO_FRONT;
             }
         }
@@ -977,6 +988,8 @@
             }
             top.deliverNewIntentLocked(
                     mCallingUid, mStartActivity.intent, mStartActivity.launchedFromPackage);
+            mSupervisor.showNonResizeableDockToastIfNeeded(mStartActivity.task,
+                    preferredLaunchStackId, mTargetStack.mStackId);
             return START_DELIVERED_TO_TOP;
         }
 
@@ -1063,8 +1076,6 @@
         }
         mSupervisor.updateUserStackLocked(mStartActivity.userId, mTargetStack);
 
-        final int preferredLaunchStackId =
-                (mOptions != null) ? mOptions.getLaunchStackId() : INVALID_STACK_ID;
         mSupervisor.showNonResizeableDockToastIfNeeded(
                 mStartActivity.task, preferredLaunchStackId, mTargetStack.mStackId);
 
@@ -1297,7 +1308,10 @@
         // same component, then instead of launching bring that one to the front.
         putIntoExistingTask &= mInTask == null && mStartActivity.resultTo == null;
         ActivityRecord intentActivity = null;
-        if (putIntoExistingTask) {
+        if (mOptions != null && mOptions.getLaunchTaskId() != -1) {
+            final TaskRecord task = mSupervisor.anyTaskForIdLocked(mOptions.getLaunchTaskId());
+            intentActivity = task != null ? task.getTopActivity() : null;
+        } else if (putIntoExistingTask) {
             // See if there is a task to bring to the front.  If this is a SINGLE_INSTANCE
             // activity, there can be one and only one instance of it in the history, and it is
             // always in its own unique task, so we do a special search.
diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index d92d942..1645366 100644
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -2778,8 +2778,10 @@
 
         // If the divider is behind the navigation bar, don't animate.
         if (mNavigationBar != null
-                && (win.getFrameLw().top + insets >= mNavigationBar.getFrameLw().top
-                        || win.getFrameLw().left + insets >= mNavigationBar.getFrameLw().left)) {
+                && ((mNavigationBarOnBottom
+                        && win.getFrameLw().top + insets >= mNavigationBar.getFrameLw().top)
+                || (!mNavigationBarOnBottom
+                        && win.getFrameLw().left + insets >= mNavigationBar.getFrameLw().left))) {
             return 0;
         }
         if (transit == TRANSIT_ENTER || transit == TRANSIT_SHOW) {
diff --git a/services/core/java/com/android/server/policy/StatusBarController.java b/services/core/java/com/android/server/policy/StatusBarController.java
index 9d353c6..86d0468 100644
--- a/services/core/java/com/android/server/policy/StatusBarController.java
+++ b/services/core/java/com/android/server/policy/StatusBarController.java
@@ -29,6 +29,8 @@
 import android.view.animation.TranslateAnimation;
 
 import com.android.internal.statusbar.IStatusBarService;
+import com.android.server.LocalServices;
+import com.android.server.statusbar.StatusBarManagerInternal;
 
 import static android.view.WindowManagerInternal.*;
 
@@ -103,6 +105,20 @@
                 }
             });
         }
+
+        @Override
+        public void onAppTransitionFinishedLocked(IBinder token) {
+            mHandler.post(new Runnable() {
+                @Override
+                public void run() {
+                    StatusBarManagerInternal statusbar = LocalServices.getService(
+                            StatusBarManagerInternal.class);
+                    if (statusbar != null) {
+                        statusbar.appTransitionFinished();
+                    }
+                }
+            });
+        }
     };
 
     public StatusBarController() {
diff --git a/services/core/java/com/android/server/statusbar/StatusBarManagerInternal.java b/services/core/java/com/android/server/statusbar/StatusBarManagerInternal.java
index 6bda4ed..9614417 100644
--- a/services/core/java/com/android/server/statusbar/StatusBarManagerInternal.java
+++ b/services/core/java/com/android/server/statusbar/StatusBarManagerInternal.java
@@ -34,4 +34,5 @@
     void setSystemUiVisibility(int vis, int fullscreenStackVis, int dockedStackVis, int mask,
             Rect fullscreenBounds, Rect dockedBounds, String cause);
     void toggleSplitScreen();
+    void appTransitionFinished();
 }
diff --git a/services/core/java/com/android/server/statusbar/StatusBarManagerService.java b/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
index 403a4c6..4a00ebd 100644
--- a/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
+++ b/services/core/java/com/android/server/statusbar/StatusBarManagerService.java
@@ -214,6 +214,15 @@
                 } catch (RemoteException ex) {}
             }
         }
+
+        public void appTransitionFinished() {
+            enforceStatusBarService();
+            if (mBar != null) {
+                try {
+                    mBar.appTransitionFinished();
+                } catch (RemoteException ex) {}
+            }
+        }
     };
 
     // ================================================================================
diff --git a/services/core/java/com/android/server/wm/AppTransition.java b/services/core/java/com/android/server/wm/AppTransition.java
index 2a57d8e..62fa013 100644
--- a/services/core/java/com/android/server/wm/AppTransition.java
+++ b/services/core/java/com/android/server/wm/AppTransition.java
@@ -50,6 +50,7 @@
 import android.content.Context;
 import android.content.res.Configuration;
 import android.graphics.Bitmap;
+import android.graphics.Path;
 import android.graphics.Rect;
 import android.os.Debug;
 import android.os.IBinder;
@@ -76,6 +77,7 @@
 import com.android.server.wm.WindowManagerService.H;
 import com.android.server.wm.animation.ClipRectLRAnimation;
 import com.android.server.wm.animation.ClipRectTBAnimation;
+import com.android.server.wm.animation.CurvedTranslateAnimation;
 
 import java.io.PrintWriter;
 import java.util.ArrayList;
@@ -130,6 +132,8 @@
     public static final int TRANSIT_TASK_IN_PLACE = 17;
     /** An activity is being relaunched (e.g. due to configuration change). */
     public static final int TRANSIT_ACTIVITY_RELAUNCH = 18;
+    /** A task is being docked from recents. */
+    public static final int TRANSIT_DOCK_TASK_FROM_RECENTS = 19;
 
     /** Fraction of animation at which the recents thumbnail stays completely transparent */
     private static final float RECENTS_THUMBNAIL_FADEIN_FRACTION = 0.5f;
@@ -142,13 +146,15 @@
     static final Interpolator TOUCH_RESPONSE_INTERPOLATOR =
             new PathInterpolator(0.3f, 0f, 0.1f, 1f);
 
+    private static final Interpolator THUMBNAIL_DOCK_INTERPOLATOR =
+            new PathInterpolator(0.85f, 0f, 1f, 1f);
+
     /**
      * Maximum duration for the clip reveal animation. This is used when there is a lot of movement
      * involved, to make it more understandable.
      */
     private static final int MAX_CLIP_REVEAL_TRANSITION_DURATION = 420;
     private static final int THUMBNAIL_APP_TRANSITION_DURATION = 336;
-    private static final int THUMBNAIL_APP_TRANSITION_ALPHA_DURATION = 336;
     private static final long APP_TRANSITION_TIMEOUT_MS = 5000;
 
     private final Context mContext;
@@ -209,6 +215,7 @@
     private final Interpolator mThumbnailFadeOutInterpolator;
     private final Interpolator mLinearOutSlowInInterpolator;
     private final Interpolator mFastOutLinearInInterpolator;
+    private final Interpolator mFastOutSlowInInterpolator;
     private final Interpolator mClipHorizontalInterpolator = new PathInterpolator(0, 0, 0.4f, 1f);
 
     private final int mClipRevealTranslationY;
@@ -229,6 +236,8 @@
                 com.android.internal.R.interpolator.linear_out_slow_in);
         mFastOutLinearInInterpolator = AnimationUtils.loadInterpolator(context,
                 com.android.internal.R.interpolator.fast_out_linear_in);
+        mFastOutSlowInInterpolator = AnimationUtils.loadInterpolator(context,
+                com.android.internal.R.interpolator.fast_out_slow_in);
         mConfigShortAnimTime = context.getResources().getInteger(
                 com.android.internal.R.integer.config_shortAnimTime);
         mDecelerateInterpolator = AnimationUtils.loadInterpolator(context,
@@ -815,12 +824,14 @@
      * Prepares the specified animation with a standard duration, interpolator, etc.
      */
     Animation prepareThumbnailAnimationWithDuration(Animation a, int appWidth, int appHeight,
-            int duration, Interpolator interpolator) {
+            long duration, Interpolator interpolator) {
         if (duration > 0) {
             a.setDuration(duration);
         }
         a.setFillAfter(true);
-        a.setInterpolator(interpolator);
+        if (interpolator != null) {
+            a.setInterpolator(interpolator);
+        }
         a.initialize(appWidth, appHeight, appWidth, appHeight);
         return a;
     }
@@ -869,55 +880,77 @@
      * This animation runs for the thumbnail that gets cross faded with the enter/exit activity
      * when a thumbnail is specified with the pending animation override.
      */
-    Animation createThumbnailAspectScaleAnimationLocked(Rect appRect, Bitmap thumbnailHeader,
-            final int taskId) {
+    Animation createThumbnailAspectScaleAnimationLocked(Rect appRect, @Nullable Rect contentInsets,
+            Bitmap thumbnailHeader, final int taskId) {
         Animation a;
         final int thumbWidthI = thumbnailHeader.getWidth();
         final float thumbWidth = thumbWidthI > 0 ? thumbWidthI : 1;
         final int thumbHeightI = thumbnailHeader.getHeight();
-        final float thumbHeight = thumbHeightI > 0 ? thumbHeightI : 1;
         final int appWidth = appRect.width();
 
         float scaleW = appWidth / thumbWidth;
-        float unscaledHeight = thumbHeight * scaleW;
         getNextAppTransitionStartRect(taskId, mTmpRect);
-        final float unscaledStartY = mTmpRect.top - (unscaledHeight - thumbHeight) / 2f;
-        final float toY = appRect.top + -unscaledStartY;
+        final float toY = mTmpRect.height() / 2 * (scaleW - 1f) + appRect.top;
+        final float fromY = mTmpRect.top;
+        final float toX = mTmpRect.width() / 2 * (scaleW - 1f) + appRect.left;
+        final float fromX = mTmpRect.left;
+        final float pivotX = mTmpRect.width() / 2;
+        final float pivotY = mTmpRect.height() / 2;
+        final long duration = getAspectScaleDuration();
+        final Interpolator interpolator = getAspectScaleInterpolator();
         if (mNextAppTransitionScaleUp) {
             // Animation up from the thumbnail to the full screen
-            Animation scale = new ScaleAnimation(1f, scaleW, 1f, scaleW,
-                    mTmpRect.left + (thumbWidth / 2f), mTmpRect.top + (thumbHeight / 2f));
-            scale.setInterpolator(TOUCH_RESPONSE_INTERPOLATOR);
-            scale.setDuration(THUMBNAIL_APP_TRANSITION_DURATION);
+            Animation scale = new ScaleAnimation(1f, scaleW, 1f, scaleW, pivotX, pivotY);
+            scale.setInterpolator(interpolator);
+            scale.setDuration(duration);
             Animation alpha = new AlphaAnimation(1f, 0f);
-            alpha.setInterpolator(mThumbnailFadeOutInterpolator);
-            alpha.setDuration(THUMBNAIL_APP_TRANSITION_ALPHA_DURATION);
-            final float toX = appRect.left + appRect.width() / 2 -
-                    (mTmpRect.left + thumbWidth / 2);
-            Animation translate = new TranslateAnimation(0, toX, 0, toY);
-            translate.setInterpolator(TOUCH_RESPONSE_INTERPOLATOR);
-            translate.setDuration(THUMBNAIL_APP_TRANSITION_DURATION);
+            alpha.setInterpolator(mNextAppTransition == TRANSIT_DOCK_TASK_FROM_RECENTS
+                    ? THUMBNAIL_DOCK_INTERPOLATOR : mThumbnailFadeOutInterpolator);
+            alpha.setDuration(mNextAppTransition == TRANSIT_DOCK_TASK_FROM_RECENTS
+                    ? duration / 2
+                    : duration);
+            Animation translate = createCurvedMotion(fromX, toX, fromY, toY);
+            translate.setInterpolator(interpolator);
+            translate.setDuration(duration);
+
+            mTmpFromClipRect.set(0, 0, thumbWidthI, thumbHeightI);
+            mTmpToClipRect.set(appRect);
+
+            // Containing frame is in screen space, but we need the clip rect in the
+            // app space.
+            mTmpToClipRect.offsetTo(0, 0);
+            mTmpToClipRect.right = (int) (mTmpToClipRect.right / scaleW);
+            mTmpToClipRect.bottom = (int) (mTmpToClipRect.bottom / scaleW);
+
+            if (contentInsets != null) {
+                mTmpToClipRect.inset((int) (-contentInsets.left * scaleW),
+                        (int) (-contentInsets.top * scaleW),
+                        (int) (-contentInsets.right * scaleW),
+                        (int) (-contentInsets.bottom * scaleW));
+            }
+
+            Animation clipAnim = new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect);
+            clipAnim.setInterpolator(interpolator);
+            clipAnim.setDuration(duration);
 
             // This AnimationSet uses the Interpolators assigned above.
             AnimationSet set = new AnimationSet(false);
             set.addAnimation(scale);
             set.addAnimation(alpha);
             set.addAnimation(translate);
+            set.addAnimation(clipAnim);
             a = set;
         } else {
             // Animation down from the full screen to the thumbnail
-            Animation scale = new ScaleAnimation(scaleW, 1f, scaleW, 1f,
-                    mTmpRect.left + (thumbWidth / 2f), mTmpRect.top + (thumbHeight / 2f));
-            scale.setInterpolator(TOUCH_RESPONSE_INTERPOLATOR);
-            scale.setDuration(THUMBNAIL_APP_TRANSITION_DURATION);
+            Animation scale = new ScaleAnimation(scaleW, 1f, scaleW, 1f, pivotX, pivotY);
+            scale.setInterpolator(interpolator);
+            scale.setDuration(duration);
             Animation alpha = new AlphaAnimation(0f, 1f);
             alpha.setInterpolator(mThumbnailFadeInInterpolator);
-            alpha.setDuration(THUMBNAIL_APP_TRANSITION_ALPHA_DURATION);
-            final float toX = appRect.left + appRect.width() / 2 -
-                    (mTmpRect.left + thumbWidth / 2);
-            Animation translate = new TranslateAnimation(toX, 0, toY, 0);
-            translate.setInterpolator(TOUCH_RESPONSE_INTERPOLATOR);
-            translate.setDuration(THUMBNAIL_APP_TRANSITION_DURATION);
+            alpha.setDuration(duration);
+            Animation translate = createCurvedMotion(toX, fromX, toY, fromY);
+            translate.setInterpolator(interpolator);
+            translate.setDuration(duration);
 
             // This AnimationSet uses the Interpolators assigned above.
             AnimationSet set = new AnimationSet(false);
@@ -928,7 +961,41 @@
 
         }
         return prepareThumbnailAnimationWithDuration(a, appWidth, appRect.height(), 0,
-                TOUCH_RESPONSE_INTERPOLATOR);
+                null);
+    }
+
+    private Animation createCurvedMotion(float fromX, float toX, float fromY, float toY) {
+
+        // Almost no x-change - use linear animation
+        if (Math.abs(toX - fromX) < 1f || mNextAppTransition != TRANSIT_DOCK_TASK_FROM_RECENTS) {
+            return new TranslateAnimation(fromX, toX, fromY, toY);
+        } else {
+            final Path path = createCurvedPath(fromX, toX, fromY, toY);
+            return new CurvedTranslateAnimation(path);
+        }
+    }
+
+    private Path createCurvedPath(float fromX, float toX, float fromY, float toY) {
+        final Path path = new Path();
+        path.moveTo(fromX, fromY);
+        path.cubicTo(fromX, fromY, toX, 0.9f * fromY + 0.1f * toY, toX, toY);
+        return path;
+    }
+
+    private long getAspectScaleDuration() {
+        if (mNextAppTransition == TRANSIT_DOCK_TASK_FROM_RECENTS) {
+            return (long) (THUMBNAIL_APP_TRANSITION_DURATION * 1.35f);
+        } else {
+            return THUMBNAIL_APP_TRANSITION_DURATION;
+        }
+    }
+
+    private Interpolator getAspectScaleInterpolator() {
+        if (mNextAppTransition == TRANSIT_DOCK_TASK_FROM_RECENTS) {
+            return mFastOutSlowInInterpolator;
+        } else {
+            return TOUCH_RESPONSE_INTERPOLATOR;
+        }
     }
 
     /**
@@ -949,15 +1016,16 @@
         final int thumbStartX = mTmpRect.left - containingFrame.left;
         final int thumbStartY = mTmpRect.top - containingFrame.top;
 
-        // Used for the ENTER_SCALE_UP and EXIT_SCALE_DOWN transitions
-        float scale = 1f;
-        int scaledTopDecor = 0;
-
         switch (thumbTransitState) {
-            case THUMBNAIL_TRANSITION_ENTER_SCALE_UP: {
-                if (freeform) {
+            case THUMBNAIL_TRANSITION_ENTER_SCALE_UP:
+            case THUMBNAIL_TRANSITION_EXIT_SCALE_DOWN: {
+                final boolean scaleUp = thumbTransitState == THUMBNAIL_TRANSITION_ENTER_SCALE_UP;
+                if (freeform && scaleUp) {
                     a = createAspectScaledThumbnailEnterFreeformAnimationLocked(
                             containingFrame, surfaceInsets, taskId);
+                } else if (freeform) {
+                    a = createAspectScaledThumbnailExitFreeformAnimationLocked(
+                            containingFrame, surfaceInsets, taskId);
                 } else {
                     AnimationSet set = new AnimationSet(true);
 
@@ -976,16 +1044,33 @@
 
                     if (orientation == Configuration.ORIENTATION_PORTRAIT) {
                         // We scale the width and clip to the top/left square
-                        scale = thumbWidth / (appWidth - contentInsets.left - contentInsets.right);
-                        scaledTopDecor = (int) (scale * contentInsets.top);
+                        // We scale the width and clip to the top/left square
+                        float scale = thumbWidth /
+                                (appWidth - contentInsets.left - contentInsets.right);
                         int unscaledThumbHeight = (int) (thumbHeight / scale);
                         mTmpFromClipRect.bottom = mTmpFromClipRect.top + unscaledThumbHeight;
 
-                        Animation scaleAnim = new ScaleAnimation(scale, 1, scale, 1,
-                                computePivot(mTmpRect.left - containingFrame.left, scale),
-                                computePivot(mTmpRect.top - containingFrame.top, scale));
-                        Animation clipAnim = new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect);
-                        Animation translateAnim = new TranslateAnimation(0, 0, -scaledTopDecor, 0);
+                        mNextAppTransitionInsets.set(contentInsets);
+
+                        Animation scaleAnim = new ScaleAnimation(
+                                scaleUp ? scale : 1, scaleUp ? 1 : scale,
+                                scaleUp ? scale : 1, scaleUp ? 1 : scale,
+                                containingFrame.width() / 2f,
+                                containingFrame.height() / 2f + contentInsets.top);
+                        final float targetX = (mTmpRect.left - containingFrame.left);
+                        final float x = containingFrame.width() / 2f
+                                - containingFrame.width() / 2f * scale;
+                        final float targetY = (mTmpRect.top - containingFrame.top);
+                        final float y = containingFrame.height() / 2f
+                                - containingFrame.height() / 2f * scale;
+                        final float startX = targetX - x;
+                        final float startY = targetY - y;
+                        Animation clipAnim = scaleUp
+                                ? new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect)
+                                : new ClipRectAnimation(mTmpToClipRect, mTmpFromClipRect);
+                        Animation translateAnim = scaleUp
+                                ? createCurvedMotion(startX, 0, startY - contentInsets.top, 0)
+                                : createCurvedMotion(0, startX, 0, startY - contentInsets.top);
 
                         set.addAnimation(clipAnim);
                         set.addAnimation(scaleAnim);
@@ -996,14 +1081,18 @@
                         mTmpFromClipRect.bottom = mTmpFromClipRect.top + thumbHeightI;
                         mTmpFromClipRect.right = mTmpFromClipRect.left + thumbWidthI;
 
-                        Animation clipAnim = new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect);
-                        Animation translateAnim = new TranslateAnimation(thumbStartX, 0,
-                                thumbStartY - contentInsets.top, 0);
+                        Animation clipAnim = scaleUp
+                                ? new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect)
+                                : new ClipRectAnimation(mTmpToClipRect, mTmpFromClipRect);
+                        Animation translateAnim = scaleUp
+                                ? createCurvedMotion(thumbStartX, 0,
+                                thumbStartY - contentInsets.top, 0)
+                                : createCurvedMotion(0, thumbStartX, 0,
+                                        thumbStartY - contentInsets.top);
 
                         set.addAnimation(clipAnim);
                         set.addAnimation(translateAnim);
                     }
-
                     a = set;
                     a.setZAdjustment(Animation.ZORDER_TOP);
                 }
@@ -1031,68 +1120,12 @@
                 }
                 break;
             }
-            case THUMBNAIL_TRANSITION_EXIT_SCALE_DOWN: {
-                // App window scaling down from full screen
-                if (freeform) {
-                    a = createAspectScaledThumbnailExitFreeformAnimationLocked(
-                            containingFrame, surfaceInsets, taskId);
-                } else {
-                    AnimationSet set = new AnimationSet(true);
-                    mTmpFromClipRect.set(containingFrame);
-                    mTmpToClipRect.set(containingFrame);
-
-                    // Containing frame is in screen space, but we need the clip rect in the
-                    // app space.
-                    mTmpFromClipRect.offsetTo(0, 0);
-                    mTmpToClipRect.offsetTo(0, 0);
-
-                    // Exclude insets region from the target clip.
-                    mTmpToClipRect.inset(contentInsets);
-                    mNextAppTransitionInsets.set(contentInsets);
-
-                    if (orientation == Configuration.ORIENTATION_PORTRAIT) {
-                        // We scale the width and clip to the top/left square
-                        scale = thumbWidth / (appWidth - contentInsets.left - contentInsets.right);
-                        scaledTopDecor = (int) (scale * contentInsets.top);
-                        int unscaledThumbHeight = (int) (thumbHeight / scale);
-                        mTmpToClipRect.bottom = mTmpToClipRect.top + unscaledThumbHeight;
-
-                        Animation scaleAnim = new ScaleAnimation(1, scale, 1, scale,
-                                computePivot(mTmpRect.left - containingFrame.left, scale),
-                                computePivot(mTmpRect.top - containingFrame.top, scale));
-                        Animation clipAnim = new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect);
-                        Animation translateAnim = new TranslateAnimation(0, 0, 0, -scaledTopDecor);
-
-                        set.addAnimation(clipAnim);
-                        set.addAnimation(scaleAnim);
-                        set.addAnimation(translateAnim);
-
-                    } else {
-                        // In landscape, we don't scale at all and only crop
-                        mTmpToClipRect.bottom = mTmpToClipRect.top + thumbHeightI;
-                        mTmpToClipRect.right = mTmpToClipRect.left + thumbWidthI;
-
-                        Animation clipAnim = new ClipRectAnimation(mTmpFromClipRect, mTmpToClipRect);
-                        Animation translateAnim = new TranslateAnimation(0, thumbStartX, 0,
-                                thumbStartY - contentInsets.top);
-
-                        set.addAnimation(clipAnim);
-                        set.addAnimation(translateAnim);
-                    }
-
-                    a = set;
-                    a.setZAdjustment(Animation.ZORDER_TOP);
-                }
-                break;
-            }
             default:
                 throw new RuntimeException("Invalid thumbnail transition state");
         }
 
-        int duration = Math.max(THUMBNAIL_APP_TRANSITION_ALPHA_DURATION,
-                THUMBNAIL_APP_TRANSITION_DURATION);
-        return prepareThumbnailAnimationWithDuration(a, appWidth, appHeight, duration,
-                TOUCH_RESPONSE_INTERPOLATOR);
+        return prepareThumbnailAnimationWithDuration(a, appWidth, appHeight,
+                getAspectScaleDuration(), getAspectScaleInterpolator());
     }
 
     private Animation createAspectScaledThumbnailEnterFreeformAnimationLocked(Rect frame,
@@ -1446,6 +1479,7 @@
                             ? WindowAnimation_activityCloseEnterAnimation
                             : WindowAnimation_activityCloseExitAnimation;
                     break;
+                case TRANSIT_DOCK_TASK_FROM_RECENTS:
                 case TRANSIT_TASK_OPEN:
                     animAttr = enter
                             ? WindowAnimation_taskOpenEnterAnimation
@@ -1504,6 +1538,7 @@
 
     int getAppStackClipMode() {
         return mNextAppTransition == TRANSIT_ACTIVITY_RELAUNCH
+                || mNextAppTransition == TRANSIT_DOCK_TASK_FROM_RECENTS
                 ? STACK_CLIP_NONE
                 : STACK_CLIP_AFTER_ANIM;
     }
@@ -1727,6 +1762,9 @@
             case TRANSIT_ACTIVITY_RELAUNCH: {
                 return "TRANSIT_ACTIVITY_RELAUNCH";
             }
+            case TRANSIT_DOCK_TASK_FROM_RECENTS: {
+                return "TRANSIT_DOCK_TASK_FROM_RECENTS";
+            }
             default: {
                 return "<UNKNOWN>";
             }
diff --git a/services/core/java/com/android/server/wm/AppWindowAnimator.java b/services/core/java/com/android/server/wm/AppWindowAnimator.java
index 6225fc6..aae52e8 100644
--- a/services/core/java/com/android/server/wm/AppWindowAnimator.java
+++ b/services/core/java/com/android/server/wm/AppWindowAnimator.java
@@ -77,8 +77,6 @@
     // requires that the duration of the two animations are the same.
     SurfaceControl thumbnail;
     int thumbnailTransactionSeq;
-    int thumbnailX;
-    int thumbnailY;
     int thumbnailLayer;
     int thumbnailForceAboveLayer;
     Animation thumbnailAnimation;
@@ -254,7 +252,6 @@
         thumbnailTransformation.clear();
         final long animationFrameTime = getAnimationFrameTime(thumbnailAnimation, currentTime);
         thumbnailAnimation.getTransformation(animationFrameTime, thumbnailTransformation);
-        thumbnailTransformation.getMatrix().preTranslate(thumbnailX, thumbnailY);
 
         ScreenRotationAnimation screenRotationAnimation =
                 mAnimator.getScreenRotationAnimationLocked(Display.DEFAULT_DISPLAY);
@@ -288,6 +285,7 @@
         }
         thumbnail.setMatrix(tmpFloats[Matrix.MSCALE_X], tmpFloats[Matrix.MSKEW_Y],
                 tmpFloats[Matrix.MSKEW_X], tmpFloats[Matrix.MSCALE_Y]);
+        thumbnail.setWindowCrop(thumbnailTransformation.getClipRect());
     }
 
     /**
@@ -461,8 +459,6 @@
         }
         if (thumbnail != null) {
             pw.print(prefix); pw.print("thumbnail="); pw.print(thumbnail);
-                    pw.print(" x="); pw.print(thumbnailX);
-                    pw.print(" y="); pw.print(thumbnailY);
                     pw.print(" layer="); pw.println(thumbnailLayer);
             pw.print(prefix); pw.print("thumbnailAnimation="); pw.println(thumbnailAnimation);
             pw.print(prefix); pw.print("thumbnailTransformation=");
diff --git a/services/core/java/com/android/server/wm/DragResizeMode.java b/services/core/java/com/android/server/wm/DragResizeMode.java
new file mode 100644
index 0000000..08acf9d
--- /dev/null
+++ b/services/core/java/com/android/server/wm/DragResizeMode.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2016 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.server.wm;
+
+import static android.app.ActivityManager.StackId.DOCKED_STACK_ID;
+import static android.app.ActivityManager.StackId.FREEFORM_WORKSPACE_STACK_ID;
+import static android.app.ActivityManager.StackId.FULLSCREEN_WORKSPACE_STACK_ID;
+import static android.app.ActivityManager.StackId.HOME_STACK_ID;
+
+/**
+ * Describes the mode in which a window is drag resizing.
+ */
+class DragResizeMode {
+
+    /**
+     * Freeform mode: Client surface is fullscreen, and client is responsible to draw window at
+     * the correct position.
+     */
+    static final int DRAG_RESIZE_MODE_FREEFORM = 0;
+
+    /**
+     * Mode for resizing the docked (and adjacent) stack: Client surface is fullscreen, but window
+     * is drawn at (0, 0), window manager is responsible for positioning the surface when draging.
+     */
+    static final int DRAG_RESIZE_MODE_DOCKED_DIVIDER = 1;
+
+    static boolean isModeAllowedForStack(int stackId, int mode) {
+        switch (mode) {
+            case DRAG_RESIZE_MODE_FREEFORM:
+                return stackId == FREEFORM_WORKSPACE_STACK_ID;
+            case DRAG_RESIZE_MODE_DOCKED_DIVIDER:
+                return stackId == DOCKED_STACK_ID
+                        || stackId == FULLSCREEN_WORKSPACE_STACK_ID
+                        || stackId == HOME_STACK_ID;
+            default:
+                return false;
+        }
+    }
+}
diff --git a/services/core/java/com/android/server/wm/Task.java b/services/core/java/com/android/server/wm/Task.java
index f097eb2..4e8f19e 100644
--- a/services/core/java/com/android/server/wm/Task.java
+++ b/services/core/java/com/android/server/wm/Task.java
@@ -18,8 +18,6 @@
 
 import static android.app.ActivityManager.StackId.DOCKED_STACK_ID;
 import static android.app.ActivityManager.StackId.FREEFORM_WORKSPACE_STACK_ID;
-import static android.app.ActivityManager.StackId.FULLSCREEN_WORKSPACE_STACK_ID;
-import static android.app.ActivityManager.StackId.PINNED_STACK_ID;
 import static android.app.ActivityManager.StackId.HOME_STACK_ID;
 import static android.content.pm.ActivityInfo.RESIZE_MODE_FORCE_RESIZEABLE;
 import static android.content.pm.ActivityInfo.RESIZE_MODE_UNRESIZEABLE;
@@ -103,6 +101,7 @@
 
     // Whether the task is currently being drag-resized
     private boolean mDragResizing;
+    private int mDragResizeMode;
 
     private boolean mHomeTask;
 
@@ -140,41 +139,7 @@
             final String text =
                     mService.mContext.getString(R.string.dock_non_resizeble_failed_to_dock_text);
             mService.mH.obtainMessage(SHOW_NON_RESIZEABLE_DOCK_TOAST, 0, 0, text).sendToTarget();
-            return;
         }
-
-        final int dockSide = mStack.getDockSide();
-        if (mResizeMode != RESIZE_MODE_FORCE_RESIZEABLE || dockSide == DOCKED_INVALID) {
-            return;
-        }
-
-        int xOffset = 0;
-        int yOffset = 0;
-        mStack.getBounds(mTmpRect);
-
-        if (dockSide == DOCKED_LEFT || dockSide == DOCKED_RIGHT) {
-            // The toast was originally placed at the bottom and centered. To place it at the
-            // bottom-center of the stack, we offset it horizontally by the diff between the center
-            // of the stack bounds vs. the center of the screen.
-            displayContent.getLogicalDisplayRect(mTmpRect2);
-            xOffset = mTmpRect.centerX() - mTmpRect2.centerX();
-        } else if (dockSide == DOCKED_TOP) {
-            // The toast was originally placed at the bottom and centered. To place it at the bottom
-            // center of the top stack, we offset it vertically by the diff between the bottom of
-            // the stack bounds vs. the bottom of the content rect.
-            //
-            // Note here we use the content rect instead of the display rect, as we want the toast's
-            // distance to the dock divider (when it's placed at the top half) to be the same as
-            // it's distance to the top of the navigation bar (when it's placed at the bottom).
-
-            // We don't adjust for DOCKED_BOTTOM case since it's already at the bottom.
-            displayContent.getContentRect(mTmpRect2);
-            yOffset = mTmpRect2.bottom - mTmpRect.bottom;
-        }
-        final String text =
-                mService.mContext.getString(R.string.dock_forced_resizable);
-        mService.mH.obtainMessage(SHOW_NON_RESIZEABLE_DOCK_TOAST,
-                xOffset, yOffset, text).sendToTarget();
     }
 
     void addAppToken(int addPos, AppWindowToken wtoken, int resizeMode, boolean homeTask) {
@@ -543,9 +508,14 @@
         mStack.getDisplayContent().getLogicalDisplayRect(out);
     }
 
-    void setDragResizing(boolean dragResizing) {
+    void setDragResizing(boolean dragResizing, int dragResizeMode) {
         if (mDragResizing != dragResizing) {
+            if (!DragResizeMode.isModeAllowedForStack(mStack.mStackId, dragResizeMode)) {
+                throw new IllegalArgumentException("Drag resize mode not allow for stack stackId="
+                        + mStack.mStackId + " dragResizeMode=" + dragResizeMode);
+            }
             mDragResizing = dragResizing;
+            mDragResizeMode = dragResizeMode;
             resetDragResizingChangeReported();
         }
     }
@@ -564,6 +534,10 @@
         return mDragResizing || (mStack != null && mStack.isDragResizing());
     }
 
+    int getDragResizeMode() {
+        return mDragResizeMode;
+    }
+
     void updateDisplayInfo(final DisplayContent displayContent) {
         if (displayContent == null) {
             return;
diff --git a/services/core/java/com/android/server/wm/TaskPositioner.java b/services/core/java/com/android/server/wm/TaskPositioner.java
index 92701de..ae70aa8 100644
--- a/services/core/java/com/android/server/wm/TaskPositioner.java
+++ b/services/core/java/com/android/server/wm/TaskPositioner.java
@@ -29,6 +29,7 @@
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
 import static com.android.server.wm.WindowManagerService.dipToPixel;
+import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_FREEFORM;
 import static com.android.server.wm.WindowState.MINIMUM_VISIBLE_HEIGHT_IN_DP;
 import static com.android.server.wm.WindowState.MINIMUM_VISIBLE_WIDTH_IN_DP;
 
@@ -379,7 +380,7 @@
 
     private void endDragLocked() {
         mResizing = false;
-        mTask.setDragResizing(false);
+        mTask.setDragResizing(false, DRAG_RESIZE_MODE_FREEFORM);
     }
 
     /** Returns true if the move operation should be ended. */
@@ -409,7 +410,7 @@
                 bottom = Math.max(top + mMinVisibleHeight, bottom + deltaY);
             }
             mWindowDragBounds.set(left, top, right, bottom);
-            mTask.setDragResizing(true);
+            mTask.setDragResizing(true, DRAG_RESIZE_MODE_FREEFORM);
             return false;
         }
 
diff --git a/services/core/java/com/android/server/wm/WindowLayersController.java b/services/core/java/com/android/server/wm/WindowLayersController.java
index e018a4e..f76f03f 100644
--- a/services/core/java/com/android/server/wm/WindowLayersController.java
+++ b/services/core/java/com/android/server/wm/WindowLayersController.java
@@ -227,6 +227,10 @@
         w.mLayer = layer;
         w.mWinAnimator.mAnimLayer = w.mLayer + w.getAnimLayerAdjustment() +
                     getSpecialWindowAnimLayerAdjustment(w);
+        if (w.mAppToken != null && w.mAppToken.mAppAnimator.thumbnailForceAboveLayer > 0
+                && w.mWinAnimator.mAnimLayer > w.mAppToken.mAppAnimator.thumbnailForceAboveLayer) {
+            w.mAppToken.mAppAnimator.thumbnailForceAboveLayer = w.mWinAnimator.mAnimLayer;
+        }
     }
 
     void dump(PrintWriter pw, String s) {
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index be1d8067..5771d69 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -202,6 +202,8 @@
 import static android.view.WindowManagerPolicy.TRANSIT_PREVIEW_DONE;
 import static com.android.server.wm.AppWindowAnimator.PROLONG_ANIMATION_AT_END;
 import static com.android.server.wm.AppWindowAnimator.PROLONG_ANIMATION_AT_START;
+import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_DOCKED_DIVIDER;
+import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_FREEFORM;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ADD_REMOVE;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ANIM;
@@ -799,7 +801,13 @@
             = new WindowManagerInternal.AppTransitionListener() {
 
         @Override
+        public void onAppTransitionCancelledLocked() {
+            mH.sendEmptyMessage(H.NOTIFY_APP_TRANSITION_CANCELLED);
+        }
+
+        @Override
         public void onAppTransitionFinishedLocked(IBinder token) {
+            mH.sendEmptyMessage(H.NOTIFY_APP_TRANSITION_FINISHED);
             AppWindowToken atoken = findAppWindowToken(token);
             if (atoken == null) {
                 return;
@@ -2921,9 +2929,9 @@
             }
         }
         final boolean freeformResizing = win.isDragResizing()
-                && win.getResizeMode() == WindowState.DRAG_RESIZE_MODE_FREEFORM;
+                && win.getResizeMode() == DRAG_RESIZE_MODE_FREEFORM;
         final boolean dockedResizing = win.isDragResizing()
-                && win.getResizeMode() == WindowState.DRAG_RESIZE_MODE_DOCKED_DIVIDER;
+                && win.getResizeMode() == DRAG_RESIZE_MODE_DOCKED_DIVIDER;
         result |= freeformResizing ? WindowManagerGlobal.RELAYOUT_RES_DRAG_RESIZING_FREEFORM : 0;
         result |= dockedResizing ? WindowManagerGlobal.RELAYOUT_RES_DRAG_RESIZING_DOCKED : 0;
         if (win.isAnimatingWithSavedSurface()) {
@@ -4025,8 +4033,6 @@
                 wAppAnimator.thumbnail.destroy();
             }
             wAppAnimator.thumbnail = tAppAnimator.thumbnail;
-            wAppAnimator.thumbnailX = tAppAnimator.thumbnailX;
-            wAppAnimator.thumbnailY = tAppAnimator.thumbnailY;
             wAppAnimator.thumbnailLayer = tAppAnimator.thumbnailLayer;
             wAppAnimator.thumbnailAnimation = tAppAnimator.thumbnailAnimation;
             tAppAnimator.thumbnail = null;
@@ -4990,6 +4996,23 @@
         }
     }
 
+    /**
+     * Puts a specific task into docked drag resizing mode. See {@link DragResizeMode}.
+     *
+     * @param taskId The id of the task to put into drag resize mode.
+     * @param resizing Whether to put the task into drag resize mode.
+     */
+    public void setTaskDockedResizing(int taskId, boolean resizing) {
+        synchronized (mWindowMap) {
+            Task task = mTaskIdToTask.get(taskId);
+            if (task == null) {
+                throw new IllegalArgumentException("setTaskDockedResizing: taskId " + taskId
+                        + " not found.");
+            }
+            task.setDragResizing(resizing, DRAG_RESIZE_MODE_DOCKED_DIVIDER);
+        }
+    }
+
     public void scrollTask(int taskId, Rect bounds) {
         synchronized (mWindowMap) {
             Task task = mTaskIdToTask.get(taskId);
@@ -7695,7 +7718,9 @@
         public static final int WINDOW_REPLACEMENT_TIMEOUT = 46;
 
         public static final int NOTIFY_APP_TRANSITION_STARTING = 47;
-        public static final int NOTIFY_STARTING_WINDOW_DRAWN = 48;
+        public static final int NOTIFY_APP_TRANSITION_CANCELLED = 48;
+        public static final int NOTIFY_APP_TRANSITION_FINISHED = 49;
+        public static final int NOTIFY_STARTING_WINDOW_DRAWN = 50;
 
         /**
          * Used to denote that an integer field in a message will not be used.
@@ -8276,6 +8301,14 @@
                     mAmInternal.notifyAppTransitionStarting(msg.arg1);
                 }
                 break;
+                case NOTIFY_APP_TRANSITION_CANCELLED: {
+                    mAmInternal.notifyAppTransitionCancelled();
+                }
+                break;
+                case NOTIFY_APP_TRANSITION_FINISHED: {
+                    mAmInternal.notifyAppTransitionFinished();
+                }
+                break;
                 case NOTIFY_STARTING_WINDOW_DRAWN: {
                     mAmInternal.notifyStartingWindowDrawn();
                 }
diff --git a/services/core/java/com/android/server/wm/WindowState.java b/services/core/java/com/android/server/wm/WindowState.java
index 38fda1b..a302006 100644
--- a/services/core/java/com/android/server/wm/WindowState.java
+++ b/services/core/java/com/android/server/wm/WindowState.java
@@ -88,6 +88,8 @@
 import static android.view.WindowManager.LayoutParams.TYPE_INPUT_METHOD;
 import static android.view.WindowManager.LayoutParams.TYPE_INPUT_METHOD_DIALOG;
 import static android.view.WindowManager.LayoutParams.TYPE_WALLPAPER;
+import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_DOCKED_DIVIDER;
+import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_FREEFORM;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ADD_REMOVE;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ANIM;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_APP_TRANSITIONS;
@@ -124,9 +126,6 @@
     // to capture touch events in that area.
     static final int RESIZE_HANDLE_WIDTH_IN_DP = 30;
 
-    static final int DRAG_RESIZE_MODE_FREEFORM = 0;
-    static final int DRAG_RESIZE_MODE_DOCKED_DIVIDER = 1;
-
     static final boolean DEBUG_DISABLE_SAVING_SURFACES = false;
 
     final WindowManagerService mService;
@@ -756,20 +755,10 @@
             mVisibleFrame.set(mContentFrame);
             mStableFrame.set(mContentFrame);
         } else if (mAttrs.type == TYPE_DOCK_DIVIDER) {
-            if (isVisibleLw() || mWinAnimator.isAnimating()) {
-                // We don't adjust the dock divider frame for reasons other than performance. The
-                // real reason is that if it gets adjusted before it is shown for the first time,
-                // it would get size (0, 0). This causes a problem when we finally show the dock
-                // divider and try to draw to it. We do set the surface size at that moment to
-                // the correct size, but it's too late for the Surface Flinger to make it
-                // available for view rendering and as a result the renderer receives size 1, 1.
-                // This way we just keep the divider at the original size and Surface Flinger
-                // will return the correct value to the renderer.
-                mDisplayContent.getDockedDividerController().positionDockedStackedDivider(mFrame);
-                mContentFrame.set(mFrame);
-                if (!mFrame.equals(mLastFrame)) {
-                    mMovedByResize = true;
-                }
+            mDisplayContent.getDockedDividerController().positionDockedStackedDivider(mFrame);
+            mContentFrame.set(mFrame);
+            if (!mFrame.equals(mLastFrame)) {
+                mMovedByResize = true;
             }
         } else {
             mContentFrame.set(Math.max(mContentFrame.left, frame.left),
@@ -1309,7 +1298,7 @@
      */
     boolean hasMoved() {
         return mHasSurface && (mContentChanged || mMovedByResize)
-                && !mAnimatingExit && !mWinAnimator.mLastHidden && mService.okToDisplay()
+                && !mAnimatingExit && mService.okToDisplay()
                 && (mFrame.top != mLastFrame.top || mFrame.left != mLastFrame.left)
                 && (mAttachedWindow == null || !mAttachedWindow.hasMoved());
     }
@@ -2258,7 +2247,7 @@
         return mResizeMode;
     }
 
-    private boolean computeDragResizing() {
+    boolean computeDragResizing() {
         final Task task = getTask();
         if (task == null) {
             return false;
@@ -2288,9 +2277,14 @@
             return;
         }
         mDragResizing = resizing;
-        mResizeMode = mDragResizing && mDisplayContent.mDividerControllerLocked.isResizing()
-                ? DRAG_RESIZE_MODE_DOCKED_DIVIDER
-                : DRAG_RESIZE_MODE_FREEFORM;
+        final Task task = getTask();
+        if (task != null && task.isDragResizing()) {
+            mResizeMode = task.getDragResizeMode();
+        } else {
+            mResizeMode = mDragResizing && mDisplayContent.mDividerControllerLocked.isResizing()
+                    ? DRAG_RESIZE_MODE_DOCKED_DIVIDER
+                    : DRAG_RESIZE_MODE_FREEFORM;
+        }
     }
 
     boolean isDragResizing() {
diff --git a/services/core/java/com/android/server/wm/WindowStateAnimator.java b/services/core/java/com/android/server/wm/WindowStateAnimator.java
index 83b6104..1e103f0 100644
--- a/services/core/java/com/android/server/wm/WindowStateAnimator.java
+++ b/services/core/java/com/android/server/wm/WindowStateAnimator.java
@@ -20,6 +20,8 @@
 import static android.view.WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
 import static android.view.WindowManager.LayoutParams.FLAG_SCALED;
 import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_STARTING;
+import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_DOCKED_DIVIDER;
+import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_FREEFORM;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ADD_REMOVE;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ANIM;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_LAYERS;
@@ -38,8 +40,6 @@
 import static com.android.server.wm.WindowManagerService.TYPE_LAYER_MULTIPLIER;
 import static com.android.server.wm.WindowManagerService.localLOGV;
 import static com.android.server.wm.WindowManagerService.logWithStack;
-import static com.android.server.wm.WindowState.DRAG_RESIZE_MODE_DOCKED_DIVIDER;
-import static com.android.server.wm.WindowState.DRAG_RESIZE_MODE_FREEFORM;
 import static com.android.server.wm.WindowSurfacePlacer.SET_ORIENTATION_CHANGE_COMPLETE;
 import static com.android.server.wm.WindowSurfacePlacer.SET_TURN_ON_SCREEN;
 
diff --git a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
index 909c5f2..5ff0613 100644
--- a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
+++ b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
@@ -19,6 +19,7 @@
 import static android.view.WindowManagerPolicy.FINISH_LAYOUT_REDO_CONFIG;
 import static android.view.WindowManagerPolicy.FINISH_LAYOUT_REDO_LAYOUT;
 import static android.view.WindowManagerPolicy.FINISH_LAYOUT_REDO_WALLPAPER;
+import static com.android.server.wm.AppWindowAnimator.PROLONG_ANIMATION_AT_START;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ADD_REMOVE;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_APP_TRANSITIONS;
@@ -31,13 +32,21 @@
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_VISIBILITY;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_WALLPAPER_LIGHT;
 import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_WINDOW_TRACE;
-import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
-import static com.android.server.wm.WindowManagerService.H.*;
-import static com.android.server.wm.WindowManagerService.LAYOUT_REPEAT_THRESHOLD;
-import static com.android.server.wm.WindowManagerService.MAX_ANIMATION_DURATION;
 import static com.android.server.wm.WindowManagerDebugConfig.SHOW_LIGHT_TRANSACTIONS;
 import static com.android.server.wm.WindowManagerDebugConfig.SHOW_TRANSACTIONS;
+import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
+import static com.android.server.wm.WindowManagerService.H.DO_TRAVERSAL;
+import static com.android.server.wm.WindowManagerService.H.NOTIFY_ACTIVITY_DRAWN;
+import static com.android.server.wm.WindowManagerService.H.NOTIFY_APP_TRANSITION_STARTING;
+import static com.android.server.wm.WindowManagerService.H.NOTIFY_STARTING_WINDOW_DRAWN;
+import static com.android.server.wm.WindowManagerService.H.REPORT_LOSING_FOCUS;
+import static com.android.server.wm.WindowManagerService.H.REPORT_WINDOWS_CHANGE;
+import static com.android.server.wm.WindowManagerService.H.SEND_NEW_CONFIGURATION;
+import static com.android.server.wm.WindowManagerService.H.UPDATE_DOCKED_STACK_DIVIDER;
+import static com.android.server.wm.WindowManagerService.H.WINDOW_FREEZE_TIMEOUT;
+import static com.android.server.wm.WindowManagerService.LAYOUT_REPEAT_THRESHOLD;
+import static com.android.server.wm.WindowManagerService.MAX_ANIMATION_DURATION;
 import static com.android.server.wm.WindowManagerService.UPDATE_FOCUS_PLACING_SURFACES;
 import static com.android.server.wm.WindowManagerService.UPDATE_FOCUS_WILL_PLACE_SURFACES;
 import static com.android.server.wm.WindowManagerService.WINDOWS_FREEZING_SCREENS_NONE;
@@ -688,7 +697,8 @@
                             w.getTask().mStack.isAdjustedForMinimizedDockedStack();
                     if ((w.mAttrs.privateFlags & PRIVATE_FLAG_NO_MOVE_ANIMATION) == 0
                             && !w.isDragResizing() && !adjustedForMinimizedDockedStack
-                            && (task == null || !w.getTask().mStack.getFreezeMovementAnimations())) {
+                            && (task == null || !w.getTask().mStack.getFreezeMovementAnimations())
+                            && !w.mWinAnimator.mLastHidden) {
                         winAnimator.setMoveAnimation(left, top);
                     } else if (w.mAttrs.type  == TYPE_DOCK_DIVIDER &&
                             displayContent.getDockedDividerController().isAdjustingForIme()) {
@@ -705,11 +715,11 @@
                         w.mClient.moved(left, top);
                     } catch (RemoteException e) {
                     }
+                    w.mMovedByResize = false;
                 }
 
                 //Slog.i(TAG, "Window " + this + " clearing mContentChanged - done placing");
                 w.mContentChanged = false;
-                w.mMovedByResize = false;
 
                 // Moved from updateWindowsAndWallpaperLocked().
                 if (w.mHasSurface) {
@@ -1224,6 +1234,10 @@
             if (mService.mAppTransition.isNextAppTransitionThumbnailUp()) {
                 createThumbnailAppAnimator(transit, wtoken, topOpeningLayer, topClosingLayer);
             }
+            if (mService.mAppTransition.getAppTransition()
+                    == AppTransition.TRANSIT_DOCK_TASK_FROM_RECENTS) {
+                appAnimator.startProlongAnimation(PROLONG_ANIMATION_AT_START);
+            }
         }
         return topOpeningApp;
     }
@@ -1562,12 +1576,13 @@
                 WindowState win = appToken.findMainWindow();
                 Rect appRect = win != null ? win.getContentFrameLw() :
                         new Rect(0, 0, displayInfo.appWidth, displayInfo.appHeight);
+                Rect insets = win != null ? win.mContentInsets : null;
                 // For the new aspect-scaled transition, we want it to always show
                 // above the animating opening/closing window, and we want to
                 // synchronize its thumbnail surface with the surface for the
                 // open/close animation (only on the way down)
                 anim = mService.mAppTransition.createThumbnailAspectScaleAnimationLocked(appRect,
-                        thumbnailHeader, taskId);
+                        insets, thumbnailHeader, taskId);
                 openingAppAnimator.thumbnailForceAboveLayer = Math.max(openingLayer, closingLayer);
                 openingAppAnimator.deferThumbnailDestruction =
                         !mService.mAppTransition.isNextThumbnailTransitionScaleUp();
@@ -1582,8 +1597,6 @@
             openingAppAnimator.thumbnailLayer = openingLayer;
             openingAppAnimator.thumbnailAnimation = anim;
             mService.mAppTransition.getNextAppTransitionStartRect(taskId, mTmpStartRect);
-            openingAppAnimator.thumbnailX = mTmpStartRect.left;
-            openingAppAnimator.thumbnailY = mTmpStartRect.top;
         } catch (Surface.OutOfResourcesException e) {
             Slog.e(TAG, "Can't allocate thumbnail/Canvas surface w="
                     + dirty.width() + " h=" + dirty.height(), e);
diff --git a/services/core/java/com/android/server/wm/animation/CurvedTranslateAnimation.java b/services/core/java/com/android/server/wm/animation/CurvedTranslateAnimation.java
new file mode 100644
index 0000000..33ac2ff
--- /dev/null
+++ b/services/core/java/com/android/server/wm/animation/CurvedTranslateAnimation.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2016 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.server.wm.animation;
+
+import android.animation.KeyframeSet;
+import android.animation.PathKeyframes;
+import android.graphics.Path;
+import android.graphics.PointF;
+import android.view.animation.Animation;
+import android.view.animation.Transformation;
+
+/**
+ * Translate animation which follows a curved path.
+ */
+public class CurvedTranslateAnimation extends Animation {
+
+    private final PathKeyframes mKeyframes;
+
+    public CurvedTranslateAnimation(Path path) {
+        mKeyframes = KeyframeSet.ofPath(path);
+    }
+
+    @Override
+    protected void applyTransformation(float interpolatedTime, Transformation t) {
+        PointF location = (PointF) mKeyframes.getValue(interpolatedTime);
+        t.getMatrix().setTranslate(location.x, location.y);
+    }
+}