Removing hacks to delay app animations until window animations complete.

- We should have been using onEnterAnimationComplete instead, which is 
  more reliable and respects the window transition developer option.

Change-Id: Ib7cd2868283cfe0e5fc79863818a614375072e0f
diff --git a/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java b/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java
index 58f7124..3ae8827 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/RecentsActivity.java
@@ -42,7 +42,7 @@
 import com.android.systemui.recents.events.EventBus;
 import com.android.systemui.recents.events.activity.AppWidgetProviderChangedEvent;
 import com.android.systemui.recents.events.activity.CancelEnterRecentsWindowAnimationEvent;
-import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationStartedEvent;
+import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationCompletedEvent;
 import com.android.systemui.recents.events.activity.EnterRecentsWindowLastAnimationFrameEvent;
 import com.android.systemui.recents.events.activity.HideRecentsEvent;
 import com.android.systemui.recents.events.activity.IterateRecentsEvent;
@@ -115,29 +115,33 @@
     });
 
     /**
-     * A common Runnable to finish Recents either by calling finish() (with a custom animation) or
-     * launching Home with some ActivityOptions.  Generally we always launch home when we exit
-     * Recents rather than just finishing the activity since we don't know what is behind Recents in
-     * the task stack.  The only case where we finish() directly is when we are cancelling the full
-     * screen transition from the app.
+     * A common Runnable to finish Recents by launching Home with an animation depending on the
+     * last activity launch state.  Generally we always launch home when we exit Recents rather than
+     * just finishing the activity since we don't know what is behind Recents in the task stack.
      */
     class FinishRecentsRunnable implements Runnable {
         Intent mLaunchIntent;
-        ActivityOptions mLaunchOpts;
 
         /**
-         * Creates a finish runnable that starts the specified intent, using the given
-         * ActivityOptions.
+         * Creates a finish runnable that starts the specified intent.
          */
-        public FinishRecentsRunnable(Intent launchIntent, ActivityOptions opts) {
+        public FinishRecentsRunnable(Intent launchIntent) {
             mLaunchIntent = launchIntent;
-            mLaunchOpts = opts;
         }
 
         @Override
         public void run() {
             try {
-                startActivityAsUser(mLaunchIntent, mLaunchOpts.toBundle(), UserHandle.CURRENT);
+                RecentsActivityLaunchState launchState =
+                        Recents.getConfiguration().getLaunchState();
+                ActivityOptions opts = ActivityOptions.makeCustomAnimation(RecentsActivity.this,
+                        launchState.launchedFromSearchHome ?
+                                R.anim.recents_to_search_launcher_enter :
+                                R.anim.recents_to_launcher_enter,
+                        launchState.launchedFromSearchHome ?
+                                R.anim.recents_to_search_launcher_exit :
+                                R.anim.recents_to_launcher_exit);
+                startActivityAsUser(mLaunchIntent, opts.toBundle(), UserHandle.CURRENT);
             } catch (Exception e) {
                 Log.e(TAG, getString(R.string.recents_launch_error_message, "Home"), e);
             }
@@ -191,18 +195,6 @@
             mRecentsView.setTaskStack(stack);
         }
 
-        // Create the home intent runnable
-        Intent homeIntent = new Intent(Intent.ACTION_MAIN, null);
-        homeIntent.addCategory(Intent.CATEGORY_HOME);
-        homeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
-                Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
-        mFinishLaunchHomeRunnable = new FinishRecentsRunnable(homeIntent,
-            ActivityOptions.makeCustomAnimation(this,
-                    launchState.launchedFromSearchHome ? R.anim.recents_to_search_launcher_enter :
-                        R.anim.recents_to_launcher_enter,
-                    launchState.launchedFromSearchHome ? R.anim.recents_to_search_launcher_exit :
-                        R.anim.recents_to_launcher_exit));
-
         // Mark the task that is the launch target
         int launchTaskIndexInStack = 0;
         if (launchState.launchedToTaskId != -1) {
@@ -361,6 +353,13 @@
         mEmptyViewStub = (ViewStub) findViewById(R.id.empty_view_stub);
         mScrimViews = new SystemBarScrimViews(this);
 
+        // Create the home intent runnable
+        Intent homeIntent = new Intent(Intent.ACTION_MAIN, null);
+        homeIntent.addCategory(Intent.CATEGORY_HOME);
+        homeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
+                Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
+        mFinishLaunchHomeRunnable = new FinishRecentsRunnable(homeIntent);
+
         // Bind the search app widget when we first start up
         if (!Constants.DebugFlags.App.DisableSearchBar) {
             mSearchWidgetInfo = ssp.getOrBindSearchAppWidget(this, mAppWidgetHost);
@@ -396,7 +395,7 @@
         boolean wasLaunchedByAm = !launchState.launchedFromHome &&
                 !launchState.launchedFromAppWithThumbnail;
         if (launchState.launchedHasConfigurationChanged || wasLaunchedByAm) {
-            EventBus.getDefault().send(new EnterRecentsWindowAnimationStartedEvent());
+            EventBus.getDefault().send(new EnterRecentsWindowAnimationCompletedEvent());
         }
 
         if (!launchState.launchedHasConfigurationChanged) {
@@ -422,6 +421,12 @@
     }
 
     @Override
+    public void onEnterAnimationComplete() {
+        super.onEnterAnimationComplete();
+        EventBus.getDefault().send(new EnterRecentsWindowAnimationCompletedEvent());
+    }
+
+    @Override
     protected void onPause() {
         super.onPause();
 
@@ -603,7 +608,7 @@
         }
     }
 
-    public final void onBusEvent(EnterRecentsWindowAnimationStartedEvent event) {
+    public final void onBusEvent(EnterRecentsWindowAnimationCompletedEvent event) {
         // Try and start the enter animation (or restart it on configuration changed)
         ReferenceCountedTrigger t = new ReferenceCountedTrigger(this, null, null, null);
         ViewAnimation.TaskViewEnterContext ctx = new ViewAnimation.TaskViewEnterContext(t);
diff --git a/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java b/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
index 4059543..6fe6909 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/RecentsImpl.java
@@ -40,7 +40,6 @@
 import com.android.systemui.R;
 import com.android.systemui.SystemUIApplication;
 import com.android.systemui.recents.events.EventBus;
-import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationStartedEvent;
 import com.android.systemui.recents.events.activity.EnterRecentsWindowLastAnimationFrameEvent;
 import com.android.systemui.recents.events.activity.HideRecentsEvent;
 import com.android.systemui.recents.events.activity.IterateRecentsEvent;
@@ -70,7 +69,7 @@
  * be called remotely from the system user.
  */
 public class RecentsImpl extends IRecentsNonSystemUserCallbacks.Stub
-        implements ActivityOptions.OnAnimationStartedListener, ActivityOptions.OnAnimationFinishedListener {
+        implements ActivityOptions.OnAnimationFinishedListener {
 
     private final static String TAG = "RecentsImpl";
     private final static boolean DEBUG = false;
@@ -140,7 +139,6 @@
     TaskStackListenerImpl mTaskStackListener;
     RecentsAppWidgetHost mAppWidgetHost;
     boolean mBootCompleted;
-    boolean mStartAnimationTriggered;
     boolean mCanReuseTaskStackViews = true;
 
     // Task launching
@@ -613,7 +611,7 @@
         final Task toTask = new Task();
         final TaskViewTransform toTransform = getThumbnailTransitionTransform(stack, stackView,
                 topTask.id, toTask);
-        ForegroundThread.getHandler().post(new Runnable() {
+        ForegroundThread.getHandler().postAtFrontOfQueue(new Runnable() {
             @Override
             public void run() {
                 final Bitmap transitionBitmap = drawThumbnailTransitionBitmap(toTask, toTransform);
@@ -635,7 +633,7 @@
         return ActivityOptions.makeCustomAnimation(mContext,
                 R.anim.recents_from_unknown_enter,
                 R.anim.recents_from_unknown_exit,
-                mHandler, this);
+                mHandler, null);
     }
 
     /**
@@ -646,12 +644,12 @@
             return ActivityOptions.makeCustomAnimation(mContext,
                     R.anim.recents_from_search_launcher_enter,
                     R.anim.recents_from_search_launcher_exit,
-                    mHandler, this);
+                    mHandler, null);
         }
         return ActivityOptions.makeCustomAnimation(mContext,
                 R.anim.recents_from_launcher_enter,
                 R.anim.recents_from_launcher_exit,
-                mHandler, this);
+                mHandler, null);
     }
 
     /**
@@ -677,7 +675,7 @@
             AppTransitionAnimationSpec[] specsArray = new AppTransitionAnimationSpec[specs.size()];
             specs.toArray(specsArray);
             return ActivityOptions.makeThumbnailAspectScaleDownAnimation(mDummyStackView,
-                    specsArray, mHandler, this, this);
+                    specsArray, mHandler, null, this);
         } else {
             // Update the destination rect
             Task toTask = new Task();
@@ -688,7 +686,7 @@
             if (thumbnail != null) {
                 return ActivityOptions.makeThumbnailAspectScaleDownAnimation(mDummyStackView,
                         thumbnail, (int) toTaskRect.left, (int) toTaskRect.top,
-                        (int) toTaskRect.width(), (int) toTaskRect.height(), mHandler, this);
+                        (int) toTaskRect.width(), (int) toTaskRect.height(), mHandler, null);
             }
             // If both the screenshot and thumbnail fails, then just fall back to the default transition
             return getUnknownTransitionActivityOptions();
@@ -841,8 +839,6 @@
     private void startRecentsActivity(ActivityManager.RunningTaskInfo topTask,
               ActivityOptions opts, boolean fromHome, boolean fromSearchHome, boolean fromThumbnail,
               TaskStackLayoutAlgorithm.VisibilityReport vr) {
-        mStartAnimationTriggered = false;
-
         // Update the configuration based on the launch options
         RecentsConfiguration config = Recents.getConfiguration();
         RecentsActivityLaunchState launchState = config.getLaunchState();
@@ -870,16 +866,7 @@
         mCanReuseTaskStackViews = true;
     }
 
-    /**** OnAnimationStartedListener Implementation ****/
-
-    @Override
-    public void onAnimationStarted() {
-        // Notify recents to start the enter animation
-        if (!mStartAnimationTriggered) {
-            mStartAnimationTriggered = true;
-            EventBus.getDefault().post(new EnterRecentsWindowAnimationStartedEvent());
-        }
-    }
+    /**** OnAnimationFinishedListener Implementation ****/
 
     @Override
     public void onAnimationFinished() {
diff --git a/packages/SystemUI/src/com/android/systemui/recents/events/activity/EnterRecentsWindowAnimationStartedEvent.java b/packages/SystemUI/src/com/android/systemui/recents/events/activity/EnterRecentsWindowAnimationCompletedEvent.java
similarity index 72%
rename from packages/SystemUI/src/com/android/systemui/recents/events/activity/EnterRecentsWindowAnimationStartedEvent.java
rename to packages/SystemUI/src/com/android/systemui/recents/events/activity/EnterRecentsWindowAnimationCompletedEvent.java
index f187178..b31f320 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/events/activity/EnterRecentsWindowAnimationStartedEvent.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/events/activity/EnterRecentsWindowAnimationCompletedEvent.java
@@ -19,8 +19,10 @@
 import com.android.systemui.recents.events.EventBus;
 
 /**
- * This is sent when the window animation into Recents starts.
+ * This is sent when the window animation into Recents completes.  We use this signal to know when
+ * we can start in-app animations so that they don't conflict with the window transition into
+ * Recents.
  */
-public class EnterRecentsWindowAnimationStartedEvent extends EventBus.Event {
+public class EnterRecentsWindowAnimationCompletedEvent extends EventBus.Event {
     // Simple event
 }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/SystemBarScrimViews.java b/packages/SystemUI/src/com/android/systemui/recents/views/SystemBarScrimViews.java
index c4e2d8a..5a09ee4 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/SystemBarScrimViews.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/SystemBarScrimViews.java
@@ -26,7 +26,7 @@
 import com.android.systemui.recents.RecentsActivityLaunchState;
 import com.android.systemui.recents.RecentsConfiguration;
 import com.android.systemui.recents.events.activity.DismissRecentsToHomeAnimationStarted;
-import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationStartedEvent;
+import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationCompletedEvent;
 
 /** Manages the scrims for the various system bars. */
 public class SystemBarScrimViews {
@@ -81,21 +81,11 @@
     /**
      * Starts animating the scrim views when entering Recents.
      */
-    public final void onBusEvent(EnterRecentsWindowAnimationStartedEvent event) {
-        RecentsConfiguration config = Recents.getConfiguration();
-        RecentsActivityLaunchState launchState = config.getLaunchState();
-        int transitionEnterFromAppDelay = mContext.getResources().getInteger(
-                R.integer.recents_enter_from_app_transition_duration);
-        int transitionEnterFromHomeDelay = mContext.getResources().getInteger(
-                R.integer.recents_enter_from_home_transition_duration);
-
+    public final void onBusEvent(EnterRecentsWindowAnimationCompletedEvent event) {
         if (mHasStatusBarScrim && mShouldAnimateStatusBarScrim) {
             mStatusBarScrimView.setTranslationY(-mStatusBarScrimView.getMeasuredHeight());
             mStatusBarScrimView.animate()
                     .translationY(0)
-                    .setStartDelay(launchState.launchedFromHome ?
-                            transitionEnterFromHomeDelay :
-                            transitionEnterFromAppDelay)
                     .setDuration(mNavBarScrimEnterDuration)
                     .setInterpolator(mQuintOutInterpolator)
                     .withStartAction(new Runnable() {
@@ -110,9 +100,6 @@
             mNavBarScrimView.setTranslationY(mNavBarScrimView.getMeasuredHeight());
             mNavBarScrimView.animate()
                     .translationY(0)
-                    .setStartDelay(launchState.launchedFromHome ?
-                            transitionEnterFromHomeDelay :
-                            transitionEnterFromAppDelay)
                     .setDuration(mNavBarScrimEnterDuration)
                     .setInterpolator(mQuintOutInterpolator)
                     .withStartAction(new Runnable() {
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 9c8829f..a57ac9d 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskStackView.java
@@ -1161,7 +1161,7 @@
             TaskView frontTv = getChildViewForTask(newFrontMostTask);
             if (frontTv != null) {
                 frontTv.onTaskBound(newFrontMostTask);
-                frontTv.fadeInActionButton(0, getResources().getInteger(
+                frontTv.fadeInActionButton(getResources().getInteger(
                         R.integer.recents_task_enter_from_app_duration));
             }
         }
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
index 4f4b91a..cb7465d 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskView.java
@@ -313,10 +313,6 @@
         RecentsActivityLaunchState launchState = config.getLaunchState();
         Resources res = mContext.getResources();
         final TaskViewTransform transform = ctx.currentTaskTransform;
-        final int transitionEnterFromAppDelay = res.getInteger(
-                R.integer.recents_enter_from_app_transition_duration);
-        final int transitionEnterFromHomeDelay = res.getInteger(
-                R.integer.recents_enter_from_home_transition_duration);
         final int taskViewEnterFromAppDuration = res.getInteger(
                 R.integer.recents_task_enter_from_app_duration);
         final int taskViewEnterFromHomeDuration = res.getInteger(
@@ -332,25 +328,22 @@
                 if (Constants.DebugFlags.App.EnableThumbnailAlphaOnFrontmost) {
                     // Animate the thumbnail alpha before the dim animation (to prevent updating the
                     // hardware layer)
-                    mThumbnailView.startEnterRecentsAnimation(transitionEnterFromAppDelay,
-                            new Runnable() {
-                                @Override
-                                public void run() {
-                                    animateDimToProgress(0, taskViewEnterFromAppDuration,
-                                            ctx.postAnimationTrigger.decrementOnAnimationEnd());
-                                }
-                            });
+                    mThumbnailView.startEnterRecentsAnimation(new Runnable() {
+                            @Override
+                            public void run() {
+                                animateDimToProgress(taskViewEnterFromAppDuration,
+                                        ctx.postAnimationTrigger.decrementOnAnimationEnd());
+                            }
+                        });
                 } else {
                     // Immediately start the dim animation
-                    animateDimToProgress(transitionEnterFromAppDelay,
-                            taskViewEnterFromAppDuration,
+                    animateDimToProgress(taskViewEnterFromAppDuration,
                             ctx.postAnimationTrigger.decrementOnAnimationEnd());
                 }
                 ctx.postAnimationTrigger.increment();
 
                 // Animate the action button in
-                fadeInActionButton(transitionEnterFromAppDelay,
-                        taskViewEnterFromAppDuration);
+                fadeInActionButton(taskViewEnterFromAppDuration);
             } else {
                 // Animate the task up if it was occluding the launch target
                 if (ctx.currentTaskOccludesLaunchTarget) {
@@ -358,7 +351,6 @@
                     setAlpha(0f);
                     animate().alpha(1f)
                             .translationY(transform.translationY)
-                            .setStartDelay(transitionEnterFromAppDelay)
                             .setUpdateListener(null)
                             .setInterpolator(mFastOutSlowInInterpolator)
                             .setDuration(taskViewEnterFromHomeDuration)
@@ -377,8 +369,7 @@
         } else if (launchState.launchedFromHome) {
             // Animate the tasks up
             int frontIndex = (ctx.currentStackViewCount - ctx.currentStackViewIndex - 1);
-            int delay = transitionEnterFromHomeDelay +
-                    frontIndex * taskViewEnterFromHomeStaggerDelay;
+            int delay = frontIndex * taskViewEnterFromHomeStaggerDelay;
 
             setScaleX(transform.scale);
             setScaleY(transform.scale);
@@ -404,13 +395,12 @@
         }
     }
 
-    public void fadeInActionButton(int delay, int duration) {
+    public void fadeInActionButton(int duration) {
         // Hide the action button
         mActionButtonView.setAlpha(0f);
 
         // Animate the action button in
         mActionButtonView.animate().alpha(1f)
-                .setStartDelay(delay)
                 .setDuration(duration)
                 .setInterpolator(PhoneStatusBar.ALPHA_IN)
                 .start();
@@ -611,12 +601,11 @@
     }
 
     /** Animates the dim to the task progress. */
-    void animateDimToProgress(int delay, int duration, Animator.AnimatorListener postAnimRunnable) {
+    void animateDimToProgress(int duration, Animator.AnimatorListener postAnimRunnable) {
         // Animate the dim into view as well
         int toDim = getDimFromTaskProgress();
         if (toDim != getDim()) {
             ObjectAnimator anim = ObjectAnimator.ofInt(TaskView.this, "dim", toDim);
-            anim.setStartDelay(delay);
             anim.setDuration(duration);
             if (postAnimRunnable != null) {
                 anim.addListener(postAnimRunnable);
diff --git a/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewThumbnail.java b/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewThumbnail.java
index 690c297..bc50846 100644
--- a/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewThumbnail.java
+++ b/packages/SystemUI/src/com/android/systemui/recents/views/TaskViewThumbnail.java
@@ -218,13 +218,13 @@
     void onFocusChanged(boolean focused) {
         if (focused) {
             if (Float.compare(getAlpha(), 1f) != 0) {
-                startFadeAnimation(1f, 0, 150, null);
+                startFadeAnimation(1f, 150, null);
             }
         } else {
             float taskViewThumbnailAlpha = getResources().getFloat(
                     R.dimen.recents_task_view_thumbnail_alpha);
             if (Float.compare(getAlpha(), taskViewThumbnailAlpha) != 0) {
-                startFadeAnimation(taskViewThumbnailAlpha, 0, 150, null);
+                startFadeAnimation(taskViewThumbnailAlpha, 150, null);
             }
         }
     }
@@ -244,10 +244,10 @@
     }
 
     /** Animates this task thumbnail as it enters Recents. */
-    void startEnterRecentsAnimation(int delay, Runnable postAnimRunnable) {
+    void startEnterRecentsAnimation(Runnable postAnimRunnable) {
         float taskViewThumbnailAlpha = getResources().getFloat(
                 R.dimen.recents_task_view_thumbnail_alpha);
-        startFadeAnimation(taskViewThumbnailAlpha, delay,
+        startFadeAnimation(taskViewThumbnailAlpha,
                 getResources().getInteger(R.integer.recents_task_enter_from_app_duration),
                 postAnimRunnable);
     }
@@ -256,14 +256,13 @@
     void startLaunchTaskAnimation(Runnable postAnimRunnable) {
         int taskViewExitToAppDuration = mContext.getResources().getInteger(
                 R.integer.recents_task_exit_to_app_duration);
-        startFadeAnimation(1f, 0, taskViewExitToAppDuration, postAnimRunnable);
+        startFadeAnimation(1f, taskViewExitToAppDuration, postAnimRunnable);
     }
 
     /** Starts a new thumbnail alpha animation. */
-    void startFadeAnimation(float finalAlpha, int delay, int duration, final Runnable postAnimRunnable) {
+    void startFadeAnimation(float finalAlpha, int duration, final Runnable postAnimRunnable) {
         Utilities.cancelAnimationWithoutCallbacks(mThumbnailAlphaAnimator);
         mThumbnailAlphaAnimator = ValueAnimator.ofFloat(mThumbnailAlpha, finalAlpha);
-        mThumbnailAlphaAnimator.setStartDelay(delay);
         mThumbnailAlphaAnimator.setDuration(duration);
         mThumbnailAlphaAnimator.setInterpolator(mFastOutSlowInInterpolator);
         mThumbnailAlphaAnimator.addUpdateListener(mThumbnailAlphaUpdateListener);