From 94296eca1077b3e5de04f1dca41fa01017c78fb5 Mon Sep 17 00:00:00 2001
From: Dake Gu <dake@google.com>
Date: Tue, 28 Jul 2015 13:46:04 -0700
Subject: [PATCH] BrowseErrorFragment: fix NPE of not attached
 BackgroundManager

BrowseErrorFragment also shows Background for selected item.
Need attach BackgroundManager to window.

b/22796403

Change-Id: I80bbaf48c85a318fdd0e07d4efd3d1b72876c03d
---
 .../android/leanback/BrowseErrorActivity.java        | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/samples/SupportLeanbackDemos/src/com/example/android/leanback/BrowseErrorActivity.java b/samples/SupportLeanbackDemos/src/com/example/android/leanback/BrowseErrorActivity.java
index 022310191..43f726eac 100644
--- a/samples/SupportLeanbackDemos/src/com/example/android/leanback/BrowseErrorActivity.java
+++ b/samples/SupportLeanbackDemos/src/com/example/android/leanback/BrowseErrorActivity.java
@@ -39,6 +39,18 @@ public class BrowseErrorActivity extends Activity
         testError();
     }
 
+    @Override
+    public void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        BackgroundHelper.attach(this);
+    }
+
+    @Override
+    public void onStop() {
+        BackgroundHelper.release(this);
+        super.onStop();
+    }
+
     private void testError() {
         mErrorFragment = new ErrorFragment();
         getFragmentManager().beginTransaction().add(R.id.main_frame, mErrorFragment).commit();