Merge "Fix NPE by making Toast on UI thread" into udc-dev am: 8b0a18473b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21803381

Change-Id: I6f3434d1f8fa54113aeb73af4d58459335299215
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

services/core/java/com/android/server/wm/ActivityTaskSupervisor.java

@@ -1729,14 +1729,11 @@ public class ActivityTaskSupervisor implements RecentTasks.Callbacks {
         }
 
         if (ActivitySecurityModelFeatureFlags.shouldShowToast(callingUid)) {
-            Toast toast = Toast.makeText(mService.mContext,
+            UiThread.getHandler().post(() -> Toast.makeText(mService.mContext,
                     (ActivitySecurityModelFeatureFlags.DOC_LINK
-                            + (restrictActivitySwitch
-                            ? "returned home due to "
-                            : "would return home due to ")
-                            + callingLabel),
-                    Toast.LENGTH_LONG);
-            UiThread.getHandler().post(toast::show);
+                            + (restrictActivitySwitch ? " returned home due to "
+                                    : " would return home due to ")
+                            + callingLabel), Toast.LENGTH_LONG).show());
         }
 
         // If the activity switch should be restricted, return home rather than the