From a8fe8b448e79677c10e5784b66168ba08b3a9fd2 Mon Sep 17 00:00:00 2001
From: wilsonshih <wilsonshih@google.com>
Date: Thu, 10 Feb 2022 18:00:06 +0800
Subject: [PATCH] Cancel recents animation when touch home key(2/2)

There should send an opening task transition to remote transition
handler to finish the recents animation. For now there is no opening
transition send to Shell because the exist home activity won't be
collected while start home activity.

To collect the home activity, do not set transient launch when start
recents animation if the top activity is home, so the home activity
would be paused. Then when user touch home key to cancel recents, the
home activity will be resumed so it can be collect to the transition.

When receive opening home activity while recents is running, enter
home and dismiss recents.

Bug: 207297486
Test: 1. Enable shell transition.
      2. Setup 3rd-party launcher as default home.
      3. Entering Recents from home.
      4. "adb shell input keyevent KEYCODE_HOME", verify recents
	 animation will be dismissed.
Test: atest NexusLauncherTests:com.android.quickstep.FallbackRecentsTest
Change-Id: I689032d1fa18aa9a923aaf89077dbd73c09721b7
---
 .../quickstep/TaskAnimationManager.java       | 36 +++++++++++++++----
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/quickstep/src/com/android/quickstep/TaskAnimationManager.java b/quickstep/src/com/android/quickstep/TaskAnimationManager.java
index 5e298f4b8d..783c868a19 100644
--- a/quickstep/src/com/android/quickstep/TaskAnimationManager.java
+++ b/quickstep/src/com/android/quickstep/TaskAnimationManager.java
@@ -44,7 +44,7 @@ import com.android.systemui.shared.system.RemoteTransitionCompat;
 import com.android.systemui.shared.system.TaskStackChangeListener;
 import com.android.systemui.shared.system.TaskStackChangeListeners;
 
-import java.util.Arrays;
+import java.util.ArrayList;
 import java.util.HashMap;
 
 public class TaskAnimationManager implements RecentsAnimationCallbacks.RecentsAnimationListener {
@@ -156,12 +156,26 @@ public class TaskAnimationManager implements RecentsAnimationCallbacks.RecentsAn
                 RemoteAnimationTargetCompat appearedTaskTarget = appearedTaskTargets[0];
                 BaseActivityInterface activityInterface = mLastGestureState.getActivityInterface();
                 // Convert appTargets to type RemoteAnimationTarget for all apps except Home app
-                RemoteAnimationTarget[] nonHomeApps = Arrays.stream(appearedTaskTargets)
-                        .filter(remoteAnimationTarget ->
-                                remoteAnimationTarget.activityType != ACTIVITY_TYPE_HOME)
+                final ArrayList<RemoteAnimationTargetCompat> tmpNonHomeApps = new ArrayList<>();
+                final ArrayList<RemoteAnimationTargetCompat> tmpHomeApps = new ArrayList<>();
+                for (RemoteAnimationTargetCompat compat : appearedTaskTargets) {
+                    if (compat.activityType != ACTIVITY_TYPE_HOME) {
+                        tmpNonHomeApps.add(compat);
+                    } else {
+                        tmpHomeApps.add(compat);
+                    }
+                }
+                RemoteAnimationTarget[] nonHomeApps = tmpNonHomeApps.stream()
                         .map(RemoteAnimationTargetCompat::unwrap)
                         .toArray(RemoteAnimationTarget[]::new);
-
+                RemoteAnimationTarget[] homeApps = tmpHomeApps.stream()
+                        .map(RemoteAnimationTargetCompat::unwrap)
+                        .toArray(RemoteAnimationTarget[]::new);
+                if (homeApps.length > 0
+                        && activityInterface.getCreatedActivity() instanceof RecentsActivity) {
+                    ((RecentsActivity) activityInterface.getCreatedActivity()).startHome();
+                    return;
+                }
                 RemoteAnimationTarget[] nonAppTargets =
                         SystemUiProxy.INSTANCE.getNoCreate()
                                 .onGoingToRecentsLegacy(false, nonHomeApps);
@@ -198,8 +212,16 @@ public class TaskAnimationManager implements RecentsAnimationCallbacks.RecentsAn
             RemoteTransitionCompat transition = new RemoteTransitionCompat(mCallbacks,
                     mController != null ? mController.getController() : null,
                     mCtx.getIApplicationThread());
-            final ActivityOptions options = ActivityOptionsCompat.makeRemoteTransition(transition)
-                    .setTransientLaunch();
+            final ActivityOptions options = ActivityOptionsCompat.makeRemoteTransition(transition);
+            // Allowing to pause Home if Home is top activity and Recents is not Home. So when user
+            // start home when recents animation is playing, the home activity can be resumed again
+            // to let the transition controller collect Home activity.
+            ActivityManager.RunningTaskInfo rti = gestureState.getRunningTask();
+            boolean homeIsOnTop = rti != null && rti.topActivity != null
+                    && rti.topActivity.equals(gestureState.getHomeIntent().getComponent());
+            if (!homeIsOnTop) {
+                options.setTransientLaunch();
+            }
             options.setSourceInfo(ActivityOptions.SourceInfo.TYPE_RECENTS_ANIMATION, eventTime);
             UI_HELPER_EXECUTOR.execute(() -> mCtx.startActivity(intent, options.toBundle()));
         } else {