Fix Local `RadioTheme` not being inherited by `Radio` Widget (#97713)

packages/flutter/lib/src/material/radio.dart

@@ -7,6 +7,7 @@ import 'package:flutter/widgets.dart';
 import 'constants.dart';
 import 'debug.dart';
 import 'material_state.dart';
+import 'radio_theme.dart';
 import 'theme.dart';
 import 'theme_data.dart';
 import 'toggleable.dart';
@@ -371,11 +372,12 @@ class _RadioState<T> extends State<Radio<T>> with TickerProviderStateMixin, Togg
   Widget build(BuildContext context) {
     assert(debugCheckHasMaterial(context));
     final ThemeData themeData = Theme.of(context);
+    final RadioThemeData radioTheme = RadioTheme.of(context);
     final MaterialTapTargetSize effectiveMaterialTapTargetSize = widget.materialTapTargetSize
-      ?? themeData.radioTheme.materialTapTargetSize
+      ?? radioTheme.materialTapTargetSize
       ?? themeData.materialTapTargetSize;
     final VisualDensity effectiveVisualDensity = widget.visualDensity
-      ?? themeData.radioTheme.visualDensity
+      ?? radioTheme.visualDensity
       ?? themeData.visualDensity;
     Size size;
     switch (effectiveMaterialTapTargetSize) {
@@ -390,7 +392,7 @@ class _RadioState<T> extends State<Radio<T>> with TickerProviderStateMixin, Togg
 
     final MaterialStateProperty<MouseCursor> effectiveMouseCursor = MaterialStateProperty.resolveWith<MouseCursor>((Set<MaterialState> states) {
       return MaterialStateProperty.resolveAs<MouseCursor?>(widget.mouseCursor, states)
-        ?? themeData.radioTheme.mouseCursor?.resolve(states)
+        ?? radioTheme.mouseCursor?.resolve(states)
         ?? MaterialStateProperty.resolveAs<MouseCursor>(MaterialStateMouseCursor.clickable, states);
     });
 
@@ -400,33 +402,33 @@ class _RadioState<T> extends State<Radio<T>> with TickerProviderStateMixin, Togg
     final Set<MaterialState> inactiveStates = states..remove(MaterialState.selected);
     final Color effectiveActiveColor = widget.fillColor?.resolve(activeStates)
       ?? _widgetFillColor.resolve(activeStates)
-      ?? themeData.radioTheme.fillColor?.resolve(activeStates)
+      ?? radioTheme.fillColor?.resolve(activeStates)
       ?? _defaultFillColor.resolve(activeStates);
     final Color effectiveInactiveColor = widget.fillColor?.resolve(inactiveStates)
       ?? _widgetFillColor.resolve(inactiveStates)
-      ?? themeData.radioTheme.fillColor?.resolve(inactiveStates)
+      ?? radioTheme.fillColor?.resolve(inactiveStates)
       ?? _defaultFillColor.resolve(inactiveStates);
 
     final Set<MaterialState> focusedStates = states..add(MaterialState.focused);
     final Color effectiveFocusOverlayColor = widget.overlayColor?.resolve(focusedStates)
       ?? widget.focusColor
-      ?? themeData.radioTheme.overlayColor?.resolve(focusedStates)
+      ?? radioTheme.overlayColor?.resolve(focusedStates)
       ?? themeData.focusColor;
 
     final Set<MaterialState> hoveredStates = states..add(MaterialState.hovered);
     final Color effectiveHoverOverlayColor = widget.overlayColor?.resolve(hoveredStates)
         ?? widget.hoverColor
-        ?? themeData.radioTheme.overlayColor?.resolve(hoveredStates)
+        ?? radioTheme.overlayColor?.resolve(hoveredStates)
         ?? themeData.hoverColor;
 
     final Set<MaterialState> activePressedStates = activeStates..add(MaterialState.pressed);
     final Color effectiveActivePressedOverlayColor = widget.overlayColor?.resolve(activePressedStates)
-        ?? themeData.radioTheme.overlayColor?.resolve(activePressedStates)
+        ?? radioTheme.overlayColor?.resolve(activePressedStates)
         ?? effectiveActiveColor.withAlpha(kRadialReactionAlpha);
 
     final Set<MaterialState> inactivePressedStates = inactiveStates..add(MaterialState.pressed);
     final Color effectiveInactivePressedOverlayColor = widget.overlayColor?.resolve(inactivePressedStates)
-        ?? themeData.radioTheme.overlayColor?.resolve(inactivePressedStates)
+        ?? radioTheme.overlayColor?.resolve(inactivePressedStates)
         ?? effectiveActiveColor.withAlpha(kRadialReactionAlpha);
 
     return Semantics(
@@ -446,7 +448,7 @@ class _RadioState<T> extends State<Radio<T>> with TickerProviderStateMixin, Togg
           ..reactionColor = effectiveActivePressedOverlayColor
           ..hoverColor = effectiveHoverOverlayColor
           ..focusColor = effectiveFocusOverlayColor
-          ..splashRadius = widget.splashRadius ?? themeData.radioTheme.splashRadius ?? kRadialReactionRadius
+          ..splashRadius = widget.splashRadius ?? radioTheme.splashRadius ?? kRadialReactionRadius
           ..downPosition = downPosition
           ..isFocused = states.contains(MaterialState.focused)
           ..isHovered = states.contains(MaterialState.hovered)

packages/flutter/test/material/radio_theme_test.dart

@@ -338,6 +338,37 @@ void main() {
       reason: 'Active pressed Radio should have overlay color: $activePressedOverlayColor',
     );
   });
+
+  testWidgets('Local RadioTheme can override global RadioTheme', (WidgetTester tester) async {
+    const Color globalThemeFillColor = Color(0xfffffff1);
+    const Color localThemeFillColor = Color(0xffff0000);
+
+    Widget buildRadio({required bool active}) {
+      return MaterialApp(
+        theme: ThemeData(
+          radioTheme: RadioThemeData(
+            fillColor: MaterialStateProperty.all<Color>(globalThemeFillColor),
+          ),
+        ),
+        home: Scaffold(
+          body: RadioTheme(
+            data: RadioThemeData(
+              fillColor: MaterialStateProperty.all<Color>(localThemeFillColor),
+            ),
+            child: Radio<int>(
+              value: active ? 1 : 0,
+              groupValue: 1,
+              onChanged: (_) { },
+            ),
+          ),
+        ),
+      );
+    }
+
+    await tester.pumpWidget(buildRadio(active: true));
+    await tester.pumpAndSettle();
+    expect(_getRadioMaterial(tester), paints..circle(color: localThemeFillColor));
+  });
 }
 
 Finder _findRadio() {