From 79f38a2e32c38e3e7ef5be515afb7d3976bac22b Mon Sep 17 00:00:00 2001
From: Xiyuan Xia <xiyuan@google.com>
Date: Thu, 28 May 2015 14:57:21 -0700
Subject: [PATCH] Avoid keyguard UI layout dimensions underflow

KeyguardBouncer could have 0 as its content area size. Two transient
cases found: on device boot with a 0 sized StatusBarWindowView and
first time showing after user switching. Be defensive and protect
against the case.

Bug:21333202
Change-Id: I73eabf64c597ea3ae96ccfba1aecf702da8dfb23
---
 .../src/com/android/keyguard/KeyguardSecurityViewFlipper.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/Keyguard/src/com/android/keyguard/KeyguardSecurityViewFlipper.java b/packages/Keyguard/src/com/android/keyguard/KeyguardSecurityViewFlipper.java
index 1c4b96325fbf8..54467f3863cf7 100644
--- a/packages/Keyguard/src/com/android/keyguard/KeyguardSecurityViewFlipper.java
+++ b/packages/Keyguard/src/com/android/keyguard/KeyguardSecurityViewFlipper.java
@@ -203,8 +203,8 @@ public class KeyguardSecurityViewFlipper extends ViewFlipper implements Keyguard
 
         final int wPadding = getPaddingLeft() + getPaddingRight();
         final int hPadding = getPaddingTop() + getPaddingBottom();
-        maxWidth -= wPadding;
-        maxHeight -= hPadding;
+        maxWidth = Math.max(0, maxWidth - wPadding);
+        maxHeight = Math.max(0, maxHeight - hPadding);
 
         int width = widthMode == MeasureSpec.EXACTLY ? widthSize : 0;
         int height = heightMode == MeasureSpec.EXACTLY ? heightSize : 0;