From 4d994261e94b8d7fd2bb383a1d41b5997fab970b Mon Sep 17 00:00:00 2001
From: George Mount <mount@google.com>
Date: Fri, 13 Jun 2014 08:20:32 -0700
Subject: [PATCH] Fix NPE when shared elements are empty.

Bug 15608384

Change-Id: Id7ae383873d8d09b51d9c680942076a3a8ffea5b
---
 core/java/android/app/ExitTransitionCoordinator.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/java/android/app/ExitTransitionCoordinator.java b/core/java/android/app/ExitTransitionCoordinator.java
index 6176c076ec797..9f3dbdcf21cfe 100644
--- a/core/java/android/app/ExitTransitionCoordinator.java
+++ b/core/java/android/app/ExitTransitionCoordinator.java
@@ -133,8 +133,10 @@ class ExitTransitionCoordinator extends ActivityTransitionCoordinator {
             public void onTransitionEnd(Transition transition) {
                 setViewVisibility(mSharedElements, View.INVISIBLE);
                 ViewGroupOverlay overlay = getDecor().getOverlay();
-                for (int i = 0; i < mSharedElementSnapshots.size(); i++) {
-                    overlay.add(mSharedElementSnapshots.get(i));
+                if (mSharedElementSnapshots != null) {
+                    for (int i = 0; i < mSharedElementSnapshots.size(); i++) {
+                        overlay.add(mSharedElementSnapshots.get(i));
+                    }
                 }
             }
         });