Update activity transition API.

Change-Id: Ic9f2ead3a6841ae7c11e38098aaf26a2b6e613fd
diff --git a/samples/ApiDemos/src/com/example/android/apis/animation/ActivityTransition.java b/samples/ApiDemos/src/com/example/android/apis/animation/ActivityTransition.java
index 8a72087..bd63870 100644
--- a/samples/ApiDemos/src/com/example/android/apis/animation/ActivityTransition.java
+++ b/samples/ApiDemos/src/com/example/android/apis/animation/ActivityTransition.java
@@ -104,7 +104,7 @@
         mHero = null;
         if (name != null) {
             mHero = (ImageView) findViewById(getIdForKey(name));
-            setSharedElementListener(new SharedElementListener() {
+            setEnterSharedElementListener(new SharedElementListener() {
                 @Override
                 public void remapSharedElements(List<String> names,
                         Map<String, View> sharedElements) {