Internal change

PiperOrigin-RevId: 704689311

Author: kendrickumstattd

lib/java/com/google/android/material/button/MaterialButton.java

@@ -29,6 +29,7 @@
 import static java.lang.Math.max;
 import static java.lang.Math.min;
 
+import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.res.ColorStateList;
 import android.content.res.TypedArray;
@@ -322,6 +323,7 @@ private SpringForce createSpringForce() {
   }
 
   @NonNull
+  @SuppressLint("KotlinPropertyAccess")
   String getA11yClassName() {
     if (!TextUtils.isEmpty(accessibilityClassName)) {
       return accessibilityClassName;
@@ -330,7 +332,8 @@ String getA11yClassName() {
     return (isCheckable() ? CompoundButton.class : Button.class).getName();
   }
 
-  void setA11yClassName(@Nullable String className) {
+  @RestrictTo(LIBRARY_GROUP)
+  public void setA11yClassName(@Nullable String className) {
     accessibilityClassName = className;
   }
 

lib/java/com/google/android/material/button/MaterialSplitButton.java

@@ -21,9 +21,12 @@
 import static com.google.android.material.theme.overlay.MaterialThemeOverlay.wrap;
 
 import android.content.Context;
+import android.os.Build.VERSION;
+import android.os.Build.VERSION_CODES;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -104,6 +107,25 @@ public void addView(@NonNull View child, int index, @Nullable ViewGroup.LayoutPa
     super.addView(child, index, params);
     if (indexOfChild(child) == 1) {
       buttonChild.setCheckable(true);
+      buttonChild.setA11yClassName(Button.class.getName());
+      if (VERSION.SDK_INT >= VERSION_CODES.R) {
+        // Set initial content description based on checked state when focused.
+        buttonChild.setStateDescription(
+            getResources()
+                .getString(
+                    buttonChild.isChecked()
+                        ? R.string.mtrl_button_expanded_content_description
+                        : R.string.mtrl_button_collapsed_content_description));
+
+        buttonChild.addOnCheckedChangeListener(
+            (button, isChecked) ->
+                button.setStateDescription(
+                    getResources()
+                        .getString(
+                            isChecked
+                                ? R.string.mtrl_button_expanded_content_description
+                                : R.string.mtrl_button_collapsed_content_description)));
+      }
     }
   }
 }

lib/java/com/google/android/material/button/res/values/strings.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2024 The Android Open Source Project
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<resources>
+  <string name="mtrl_button_expanded_content_description" description="An announcement for the expanded menu state of the trailing button in split button [CHAR LIMIT=NONE]">Expanded</string>
+  <string name="mtrl_button_collapsed_content_description" description="An announcement for the collapsed menu state of the trailing button in split button [CHAR LIMIT=NONE]">Collapsed</string>
+</resources>