From 5c143098a481a1877975cbc74308d1c68ca9c37a Mon Sep 17 00:00:00 2001
From: Mykhailo Shchurov <shchurov.m@gmail.com>
Date: Sun, 28 Jun 2015 11:03:03 +0300
Subject: [PATCH] QuizActivity. Fixed multiple back-presses crash.

---
 .../com/google/samples/apps/topeka/activity/QuizActivity.java  | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/app/src/main/java/com/google/samples/apps/topeka/activity/QuizActivity.java b/app/src/main/java/com/google/samples/apps/topeka/activity/QuizActivity.java
index 2005c009..8026f5f2 100644
--- a/app/src/main/java/com/google/samples/apps/topeka/activity/QuizActivity.java
+++ b/app/src/main/java/com/google/samples/apps/topeka/activity/QuizActivity.java
@@ -132,6 +132,9 @@ public void onBackPressed() {
                 new AnimatorListenerAdapter() {
                     @Override
                     public void onAnimationEnd(Animator animation) {
+                        if (isFinishing() || isDestroyed()) {
+                            return;
+                        }
                         QuizActivity.super.onBackPressed();
                         super.onAnimationEnd(animation);
                     }