Merge "Fix unnecessary and harmful task movement."

3 files changed, 22 insertions, 11 deletions

diff --git a/services/java/com/android/server/am/ActivityStackSupervisor.java b/services/java/com/android/server/am/ActivityStackSupervisor.java
index a4fd7ad..4f30558 100644
--- a/services/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/java/com/android/server/am/ActivityStackSupervisor.java
@@ -2170,29 +2170,31 @@ public final class ActivityStackSupervisor {
         for (int stackNdx = mStacks.size() - 1; stackNdx >= 0; --stackNdx) {
             final ActivityStack stack = mStacks.get(stackNdx);
             final ActivityRecord r = stack.topRunningActivityLocked(null);
+            final ActivityState state = r == null ? ActivityState.DESTROYED : r.state;
             if (isFrontStack(stack)) {
                 if (r == null) {
                     Slog.e(TAG, "validateTop...: null top activity, stack=" + stack);
                 } else {
-                    if (stack.mPausingActivity != null) {
+                    final ActivityRecord pausing = stack.mPausingActivity;
+                    if (pausing != null && pausing == r) {
                         Slog.e(TAG, "validateTop...: top stack has pausing activity r=" + r +
-                            " state=" + r.state);
+                            " state=" + state);
                     }
-                    if (r.state != ActivityState.INITIALIZING &&
-                            r.state != ActivityState.RESUMED) {
+                    if (state != ActivityState.INITIALIZING && state != ActivityState.RESUMED) {
                         Slog.e(TAG, "validateTop...: activity in front not resumed r=" + r +
-                                " state=" + r.state);
+                                " state=" + state);
                     }
                 }
             } else {
-                if (stack.mResumedActivity != null) {
+                final ActivityRecord resumed = stack.mResumedActivity;
+                if (resumed != null && resumed == r) {
                     Slog.e(TAG, "validateTop...: back stack has resumed activity r=" + r +
-                        " state=" + r.state);
+                        " state=" + state);
                 }
-                if (r != null && (r.state == ActivityState.INITIALIZING
-                        || r.state == ActivityState.RESUMED)) {
+                if (r != null && (state == ActivityState.INITIALIZING
+                        || state == ActivityState.RESUMED)) {
                     Slog.e(TAG, "validateTop...: activity in back resumed r=" + r +
-                            " state=" + r.state);
+                            " state=" + state);
                 }
             }
         }
diff --git a/services/java/com/android/server/wm/TaskStack.java b/services/java/com/android/server/wm/TaskStack.java
index 827958d..b43a7a1 100644
--- a/services/java/com/android/server/wm/TaskStack.java
+++ b/services/java/com/android/server/wm/TaskStack.java
@@ -16,7 +16,12 @@
 
 package com.android.server.wm;
 
+import static com.android.server.wm.WindowManagerService.DEBUG_TASK_MOVEMENT;
+import static com.android.server.wm.WindowManagerService.TAG;
+
 import android.graphics.Rect;
+import android.os.Debug;
+import android.util.Slog;
 import android.util.TypedValue;
 
 import static com.android.server.am.ActivityStackSupervisor.HOME_STACK_ID;
@@ -88,6 +93,7 @@ public class TaskStack {
      * @param toTop Whether to add it to the top or bottom.
      */
     boolean addTask(Task task, boolean toTop) {
+        if (DEBUG_TASK_MOVEMENT) Slog.d(TAG, "addTask: task=" + task + " toTop=" + toTop);
         mStackBox.makeDirty();
         mTasks.add(toTop ? mTasks.size() : 0, task);
         task.mStack = this;
@@ -95,11 +101,14 @@ public class TaskStack {
     }
 
     boolean moveTaskToTop(Task task) {
+        if (DEBUG_TASK_MOVEMENT) Slog.d(TAG, "moveTaskToTop: task=" + task + " Callers="
+                + Debug.getCallers(6));
         mTasks.remove(task);
         return addTask(task, true);
     }
 
     boolean moveTaskToBottom(Task task) {
+        if (DEBUG_TASK_MOVEMENT) Slog.d(TAG, "moveTaskToBottom: task=" + task);
         mTasks.remove(task);
         return addTask(task, false);
     }
@@ -110,6 +119,7 @@ public class TaskStack {
      * @param task The Task to delete.
      */
     void removeTask(Task task) {
+        if (DEBUG_TASK_MOVEMENT) Slog.d(TAG, "removeTask: task=" + task);
         mStackBox.makeDirty();
         mTasks.remove(task);
     }
diff --git a/services/java/com/android/server/wm/WindowManagerService.java b/services/java/com/android/server/wm/WindowManagerService.java
index ab0590e..65ca00d 100644
--- a/services/java/com/android/server/wm/WindowManagerService.java
+++ b/services/java/com/android/server/wm/WindowManagerService.java
@@ -3777,7 +3777,6 @@ public class WindowManagerService extends IWindowManager.Stub
                 }
                 changed = mFocusedApp != newFocus;
                 mFocusedApp = newFocus;
-                moveTaskToTop(newFocus.groupId);
                 if (DEBUG_FOCUS) Slog.v(TAG, "Set focused app to: " + mFocusedApp
                         + " moveFocusNow=" + moveFocusNow);
                 if (changed) {