[YevheniiKotyrlo]

Summary:

ScrollView and ActivityIndicator hand their props to a native component without the translation View gives aria-hidden, so the native side gets a prop it does not read and their content stays reachable by TalkBack and VoiceOver. #53364 closed the same gap for Text, TextInput and Image.

ScrollView now maps aria-hidden to importantForAccessibility="no-hide-descendants" and accessibilityElementsHidden, as View does. ActivityIndicator hands it to the View that wraps its indicator, which applies the same mapping. RNTester's aria-hidden example gains a ScrollView and an ActivityIndicator.

Left out: Switch, which takes keyboard focus; RefreshControl, which on Android wraps its scroll view, so hiding it would hide the scrolled content there and not on iOS; DrawerLayoutAndroid and ProgressBarAndroid, which are deprecated.

Changelog:

[GENERAL] [FIXED] - aria-hidden support for ScrollView and ActivityIndicator

Test Plan:

• Fantom: new cases in ScrollView-itest.js and ActivityIndicator-itest.js. Without the change the two mapping cases fail, the host rendering no importantForAccessibility; with it yarn fantom ScrollView ActivityIndicator-itest View-itest passes 329 tests in 8 suites. Run in reactnativecommunity/react-native-android:latest, the image build_fantom_runner uses.
• yarn lint, yarn flow-check, yarn format-check-javascript, yarn test-ci (244 suites), yarn build-types (no change to the generated types) and yarn test-generated-typescript pass in the same image.
• RNTester, APIs → Accessibility → aria-hidden, on an Android 16 emulator with TalkBack and aria-hidden on: touching the scroll view's text or the indicator moves TalkBack's focus onto it without the change, and leaves it where it was with the change. Images in the comment below.
• Not run on iOS; the mapping there is the one View uses.

[YevheniiKotyrlo]

Device evidence — before / after

UNFIXED — with aria-hidden on, touching the text in the ScrollView or the ActivityIndicator moves TalkBack's focus onto it.

FIXED — the focus stays on the switch it was on.

	before — main at f7cb270fba	after — with this PR
text in a hidden ScrollView
hidden ActivityIndicator

RNTester debug builds of main at f7cb270fba with the new example rows, without and with this change, on an Android 16 (API 36) emulator, 1140×2400 at density 480. With aria-hidden on, TalkBack's focus is first put on the switch and the screen is then touched at the scroll view's text or at the indicator: without the change the focus moves to the hidden element, with it the focus stays on the switch. A second round put the focus in the same place in every frame.