[Focus Rings] Fix BaseSlider crash in calculateTrackCenter() when labels list is empty

dsn5ft · dsn5ft · commit dd713b6ea5da · 2026-04-07T16:02:07.000Z
Resolves #5049 PiperOrigin-RevId: 895902192
diff --git a/lib/java/com/google/android/material/slider/BaseSlider.java b/lib/java/com/google/android/material/slider/BaseSlider.java
@@ -2719,7 +2719,7 @@ private void updateHaloHotspot() {
 
   private int calculateTrackCenter() {
     return widgetThickness / 2
-        + (labelBehavior == LABEL_WITHIN_BOUNDS || shouldAlwaysShowLabel()
+        + ((labelBehavior == LABEL_WITHIN_BOUNDS || shouldAlwaysShowLabel()) && !labels.isEmpty()
             ? labels.get(0).getIntrinsicHeight()
             : 0);
   }

Original file line number	Diff line number	Diff line change
`@@ -2719,7 +2719,7 @@ private void updateHaloHotspot() {`
`2719`	`2719`
`2720`	`2720`	`private int calculateTrackCenter() {`
`2721`	`2721`	`return widgetThickness / 2`
`2722`		`- + (labelBehavior == LABEL_WITHIN_BOUNDS \|\| shouldAlwaysShowLabel()`
	`2722`	`+ + ((labelBehavior == LABEL_WITHIN_BOUNDS \|\| shouldAlwaysShowLabel()) && !labels.isEmpty()`
`2723`	`2723`	`? labels.get(0).getIntrinsicHeight()`
`2724`	`2724`	`: 0);`
`2725`	`2725`	`}`