Add safety net if StackView duration would be negative.

Bug: 32699754
Change-Id: I00d4b2398fa7f4ab4cdad290a346b0f09c2af242

diff --git a/core/java/android/widget/StackView.java b/core/java/android/widget/StackView.java
index 0e99c02..1b9055c 100644 (file)
--- a/core/java/android/widget/StackView.java
+++ b/core/java/android/widget/StackView.java
@@ -1051,6 +1051,11 @@ public class StackView extends AdapterViewAnimator {
 
                 float d = (float) Math.hypot(viewLp.horizontalOffset, viewLp.verticalOffset);
                 float maxd = (float) Math.hypot(mSlideAmount, 0.4f * mSlideAmount);
+                if (d > maxd) {
+                    // Because mSlideAmount is updated in onLayout(), it is possible that d > maxd
+                    // if we get onLayout() right before this method is called.
+                    d = maxd;
+                }
 
                 if (velocity == 0) {
                     return (invert ? (1 - d / maxd) : d / maxd) * DEFAULT_ANIMATION_DURATION;