Clean up out of date logic for starting activity

- ASS#handleNonResizableTaskIfNeeded(), no longer necessary
  to find proper stack for the task on default display since
  exception would be thrown if the task cannot be launched
  on target display.
- ActivityStarter#computeStackFocus(), no more dynamic or
  static stacks.

Bug: 111363427
Test: atest ActivityManagerMultiDisplayTests

Change-Id: Id6da1e1e448b8bc525820cbf407eadd8c86a12bf

2 files changed, 4 insertions, 18 deletions

diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index 0477d73301f1..7208b2414008 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -53,6 +53,7 @@ import static android.view.Display.DEFAULT_DISPLAY;
 import static android.view.Display.INVALID_DISPLAY;
 import static android.view.Display.TYPE_VIRTUAL;
 import static android.view.WindowManager.TRANSIT_DOCK_TASK_FROM_RECENTS;
+
 import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_ALL;
 import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_FOCUS;
 import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_IDLE;
@@ -99,6 +100,7 @@ import static com.android.server.am.TaskRecord.LOCK_TASK_AUTH_WHITELISTED;
 import static com.android.server.am.TaskRecord.REPARENT_KEEP_STACK_AT_FRONT;
 import static com.android.server.am.TaskRecord.REPARENT_LEAVE_STACK_IN_PLACE;
 import static com.android.server.am.TaskRecord.REPARENT_MOVE_STACK_TO_FRONT;
+
 import static java.lang.Integer.MAX_VALUE;
 
 import android.Manifest;
@@ -4456,10 +4458,6 @@ public class ActivityStackSupervisor extends ConfigurationContainer implements D
             if (!task.canBeLaunchedOnDisplay(actualDisplayId)) {
                 throw new IllegalStateException("Task resolved to incompatible display");
             }
-            // The task might have landed on a display different from requested.
-            // TODO(multi-display): Find proper stack for the task on the default display.
-            mService.setTaskWindowingMode(task.taskId,
-                    WINDOWING_MODE_FULLSCREEN_OR_SPLIT_SCREEN_SECONDARY, true /* toTop */);
             if (preferredDisplayId != actualDisplayId) {
                 Slog.w(TAG, "Failed to put " + task + " on display " + preferredDisplayId);
                 // Display a warning toast that we failed to put a task on a secondary display.
diff --git a/services/core/java/com/android/server/am/ActivityStarter.java b/services/core/java/com/android/server/am/ActivityStarter.java
index 2bd22e8601d6..13b16b2fb84c 100644
--- a/services/core/java/com/android/server/am/ActivityStarter.java
+++ b/services/core/java/com/android/server/am/ActivityStarter.java
@@ -1477,7 +1477,7 @@ class ActivityStarter {
         if (mStartActivity.resultTo == null && mInTask == null && !mAddingToTask
                 && (mLaunchFlags & FLAG_ACTIVITY_NEW_TASK) != 0) {
             newTask = true;
-            result = setTaskFromReuseOrCreateNewTask(taskToAffiliate, topStack);
+            result = setTaskFromReuseOrCreateNewTask(taskToAffiliate);
         } else if (mSourceRecord != null) {
             result = setTaskFromSourceRecord();
         } else if (mInTask != null) {
@@ -2125,8 +2125,7 @@ class ActivityStarter {
         mSupervisor.updateUserStackLocked(mStartActivity.userId, mTargetStack);
     }
 
-    private int setTaskFromReuseOrCreateNewTask(
-            TaskRecord taskToAffiliate, ActivityStack topStack) {
+    private int setTaskFromReuseOrCreateNewTask(TaskRecord taskToAffiliate) {
         mTargetStack = computeStackFocus(mStartActivity, true, mLaunchFlags, mOptions);
 
         // Do no move the target stack to front yet, as we might bail if
@@ -2431,17 +2430,6 @@ class ActivityStarter {
             }
         }
         if (stack == null) {
-            // We first try to put the task in the first dynamic stack on home display.
-            final ActivityDisplay display = mSupervisor.getDefaultDisplay();
-            for (int stackNdx = display.getChildCount() - 1; stackNdx >= 0; --stackNdx) {
-                stack = display.getChildAt(stackNdx);
-                if (!stack.isOnHomeDisplay()) {
-                    if (DEBUG_FOCUS || DEBUG_STACK) Slog.d(TAG_FOCUS,
-                            "computeStackFocus: Setting focused stack=" + stack);
-                    return stack;
-                }
-            }
-            // If there is no suitable dynamic stack then we figure out which static stack to use.
             stack = mSupervisor.getLaunchStack(r, aOptions, task, ON_TOP);
         }
         if (DEBUG_FOCUS || DEBUG_STACK) Slog.d(TAG_FOCUS, "computeStackFocus: New stack r="