From 5dce006a5c1649df4eb6631c85619017728726af Mon Sep 17 00:00:00 2001
From: Material Design Team <noreply@google.com>
Date: Mon, 31 Jan 2022 12:50:46 -0800
Subject: [PATCH] [CollapsingToolbarLayout] Constrain adjusted font weight to
 acceptable values

PiperOrigin-RevId: 425438646
---
 .../material/internal/CollapsingTextHelper.java    | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/lib/java/com/google/android/material/internal/CollapsingTextHelper.java b/lib/java/com/google/android/material/internal/CollapsingTextHelper.java
index 7a677943cb7..3d551381fab 100644
--- a/lib/java/com/google/android/material/internal/CollapsingTextHelper.java
+++ b/lib/java/com/google/android/material/internal/CollapsingTextHelper.java
@@ -523,16 +523,20 @@ public void maybeUpdateFontWeightAdjustment(@NonNull Configuration configuration
   }
 
   private boolean shouldUseBoldTypefaces() {
-    return VERSION.SDK_INT >= VERSION_CODES.S && fontWeightAdjustment >= FontStyle.FONT_WEIGHT_MIN;
+    return VERSION.SDK_INT >= VERSION_CODES.S
+        && fontWeightAdjustment != Configuration.FONT_WEIGHT_ADJUSTMENT_UNDEFINED
+        && fontWeightAdjustment != 0;
   }
 
   @Nullable
   private Typeface maybeCloneWithAdjustment(@NonNull Typeface typeface) {
     if (shouldUseBoldTypefaces()) {
-      return Typeface.create(
-          typeface,
-          typeface.getWeight() + fontWeightAdjustment,
-          typeface.isItalic());
+      int adjustedWeight =
+          MathUtils.clamp(
+              typeface.getWeight() + fontWeightAdjustment,
+              FontStyle.FONT_WEIGHT_MIN,
+              FontStyle.FONT_WEIGHT_MAX);
+      return Typeface.create(typeface, adjustedWeight, typeface.isItalic());
     }
     return null;
   }