Added talkback support for button accessibility: disabled prop (#31001)

Summary:
Issue # #30934 .When using a screen reader disabled buttons do not announce that they are disabled.

## Changelog

[Android] [Changed] - Passing accessibility state in button so it can announce disabled in talkback

Pull Request resolved: #31001

Test Plan:
I have added Button in Button Example with accessibiltyState prop that will announce button is disabled when testing with talkback.

## Ios test
I am unable to run ios project on my machine. RNTesterPods.xcworkspace gives workspace integrity error :/

Reviewed By: kacieb

Differential Revision: D26492483

Pulled By: lunaleaps

fbshipit-source-id: c4bbe8ca896b0d303976591c300ccac67a96ac73

Author: Huzaifa Khan

Libraries/Components/Button.js

@@ -18,9 +18,9 @@ const Text = require('../Text/Text');
 const TouchableNativeFeedback = require('./Touchable/TouchableNativeFeedback');
 const TouchableOpacity = require('./Touchable/TouchableOpacity');
 const View = require('./View/View');
-
 const invariant = require('invariant');
 
+import type {AccessibilityState} from './View/ViewAccessibility';
 import type {PressEvent} from '../Types/CoreEventTypes';
 import type {ColorValue} from '../StyleSheet/StyleSheet';
 
@@ -134,6 +134,11 @@ type ButtonProps = $ReadOnly<{|
     Used to locate this view in end-to-end tests.
    */
   testID?: ?string,
+
+  /**
+   * Accessibility props.
+   */
+  accessibilityState?: ?AccessibilityState,
 |}>;
 
 /**
@@ -261,7 +266,6 @@ class Button extends React.Component<ButtonProps> {
       nextFocusLeft,
       nextFocusRight,
       nextFocusUp,
-      disabled,
       testID,
     } = this.props;
     const buttonStyles = [styles.button];
@@ -273,12 +277,22 @@ class Button extends React.Component<ButtonProps> {
         buttonStyles.push({backgroundColor: color});
       }
     }
-    const accessibilityState = {};
+
+    const disabled =
+      this.props.disabled != null
+        ? this.props.disabled
+        : this.props.accessibilityState?.disabled;
+
+    const accessibilityState =
+      disabled !== this.props.accessibilityState?.disabled
+        ? {...this.props.accessibilityState, disabled}
+        : this.props.accessibilityState;
+
     if (disabled) {
       buttonStyles.push(styles.buttonDisabled);
       textStyles.push(styles.textDisabled);
-      accessibilityState.disabled = true;
     }
+
     invariant(
       typeof title === 'string',
       'The title prop of a Button must be a string',
@@ -287,6 +301,7 @@ class Button extends React.Component<ButtonProps> {
       Platform.OS === 'android' ? title.toUpperCase() : title;
     const Touchable =
       Platform.OS === 'android' ? TouchableNativeFeedback : TouchableOpacity;
+
     return (
       <Touchable
         accessibilityLabel={accessibilityLabel}

packages/rn-tester/js/examples/Button/ButtonExample.js

@@ -174,6 +174,29 @@ exports.examples = [
       );
     },
   },
+  {
+    title: 'Button with accessibilityState={{disabled: true}}',
+    description: ('Note: This prop will announce on TalkBack that the button is disabled. ' +
+      'The "disabled" prop has higher precedence on the state of the component': string),
+    render: function(): React.Node {
+      return (
+        <RNTesterThemeContext.Consumer>
+          {theme => {
+            return (
+              <Button
+                accessibilityState={{disabled: true}}
+                onPress={() => onButtonPress('submitted')}
+                testID="accessibilityState_button"
+                color={theme.LinkColor}
+                title="Submit Application"
+                accessibilityLabel="Press to submit your application!"
+              />
+            );
+          }}
+        </RNTesterThemeContext.Consumer>
+      );
+    },
+  },
 ];
 
 const styles = StyleSheet.create({