Fix issue #7401818: Wrong transition animation when clearing task

When we are clearing activities off the top of a task, propagate
any activity options down from the top-most one to whatever top
activity we are keeping.  This ensures that if we set the activity
options on the top activity of the task previously to give it the
correct animation, we still keep that animation for the activity
that really ends up being the top.

Change-Id: I6919b644a530ac283fe4d320496edc2bf72aa04e

Author: Dianne Hackborn

services/java/com/android/server/am/ActivityRecord.java

@@ -602,6 +602,15 @@ void updateOptionsLocked(Bundle options) {
         }
     }
 
+    void updateOptionsLocked(ActivityOptions options) {
+        if (options != null) {
+            if (pendingOptions != null) {
+                pendingOptions.abort();
+            }
+            pendingOptions = options;
+        }
+    }
+
     void applyOptionsLocked() {
         if (pendingOptions != null) {
             final int animationType = pendingOptions.getAnimationType();
@@ -653,6 +662,12 @@ void clearOptionsLocked() {
         }
     }
 
+    ActivityOptions takeOptionsLocked() {
+        ActivityOptions opts = pendingOptions;
+        pendingOptions = null;
+        return opts;
+    }
+
     void removeUriPermissionsLocked() {
         if (uriPermissions != null) {
             uriPermissions.removeUriPermissionsLocked();

services/java/com/android/server/am/ActivityStack.java

@@ -1963,6 +1963,8 @@ private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
         int taskTopI = -1;
         int replyChainEnd = -1;
         int lastReparentPos = -1;
+        ActivityOptions topOptions = null;
+        boolean canMoveOptions = true;
         for (int i=mHistory.size()-1; i>=-1; i--) {
             ActivityRecord below = i >= 0 ? mHistory.get(i) : null;
 
@@ -2048,6 +2050,7 @@ private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
                         }
                         int dstPos = 0;
                         ThumbnailHolder curThumbHolder = target.thumbHolder;
+                        boolean gotOptions = !canMoveOptions;
                         for (int srcPos=targetI; srcPos<=replyChainEnd; srcPos++) {
                             p = mHistory.get(srcPos);
                             if (p.finishing) {
@@ -2057,6 +2060,13 @@ private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
                                     + " out to target's task " + target.task);
                             p.setTask(target.task, curThumbHolder, false);
                             curThumbHolder = p.thumbHolder;
+                            canMoveOptions = false;
+                            if (!gotOptions && topOptions == null) {
+                                topOptions = p.takeOptionsLocked();
+                                if (topOptions != null) {
+                                    gotOptions = true;
+                                }
+                            }
                             if (DEBUG_ADD_REMOVE) {
                                 RuntimeException here = new RuntimeException("here");
                                 here.fillInStackTrace();
@@ -2101,11 +2111,19 @@ private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
                             replyChainEnd = targetI;
                         }
                         ActivityRecord p = null;
+                        boolean gotOptions = !canMoveOptions;
                         for (int srcPos=targetI; srcPos<=replyChainEnd; srcPos++) {
                             p = mHistory.get(srcPos);
                             if (p.finishing) {
                                 continue;
                             }
+                            canMoveOptions = false;
+                            if (!gotOptions && topOptions == null) {
+                                topOptions = p.takeOptionsLocked();
+                                if (topOptions != null) {
+                                    gotOptions = true;
+                                }
+                            }
                             if (finishActivityLocked(p, srcPos,
                                     Activity.RESULT_CANCELED, null, "reset", false)) {
                                 replyChainEnd--;
@@ -2245,7 +2263,17 @@ private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
             target = below;
             targetI = i;
         }
-        
+
+        if (topOptions != null) {
+            // If we got some ActivityOptions from an activity on top that
+            // was removed from the task, propagate them to the new real top.
+            if (taskTop != null) {
+                taskTop.updateOptionsLocked(topOptions);
+            } else {
+                topOptions.abort();
+            }
+        }
+
         return taskTop;
     }
 
@@ -2296,6 +2324,10 @@ private final ActivityRecord performClearTaskLocked(int taskId,
                     if (r.finishing) {
                         continue;
                     }
+                    ActivityOptions opts = r.takeOptionsLocked();
+                    if (opts != null) {
+                        ret.updateOptionsLocked(opts);
+                    }
                     if (finishActivityLocked(r, i, Activity.RESULT_CANCELED,
                             null, "clear", false)) {
                         i--;