fix(android): give cluster markers a TalkBack label

[hubertmadrzejewski]

What does this change?

Cluster badges on Android are announced by TalkBack with their exact member count, for example "12 markers in this cluster". The count comes from a plurals resource, not the abbreviated badge text.

Closes #101.

How was it verified?

• :react-native-better-maps:assembleDebug and :react-native-better-maps:testDebugUnitTest on arm64-v8a. 154 tests, 0 failures.
• The debug AAR contains better_maps_cluster_description with both plural forms.
• bun run lint, bun run typecheck, and bun run build pass.
• TalkBack on a device or emulator was not run. That needs the example app, the clustering scenario, and a Google Maps key.

Scope

• Providers: google
• Platforms: Android

Checklist

• bun run lint, bun run typecheck and bun run build pass
• Tests pass, and new behavior is covered by a test
• Nitro specs changed? bun run nitrogen was re-run (package/nitrogen/ is generated and gitignored, never committed)
• Public API changed? The README and the capability matrix are updated
• Commits follow Conventional Commits
• Behavior changed without a type change? Say so explicitly above — it breaks consumers whose code still compiles

Nitro specs and the public API are unchanged.

TalkBack now reads the exact cluster count. Marker taps still zoom, and the types are unchanged, so this does not break consumers whose code still compiles.

The new label is not covered by a unit test. The Android test suite is plain JUnit and has no Robolectric, so it cannot load the plurals resource. The existing 154 tests still pass.

[github-actions]

React Doctor found 4 issues in 2 files · 1 error & 3 warnings · score 81 / 100 (Needs work) · full project

Errors

• ❌ src/hooks/useCollectedOverlays.ts:38 Ref mutated during render no-ref-current-in-render

3 warnings

src/components/MapView.tsx

• ⚠️ L44 React function has high control-flow complexity no-high-complexity-react-function
• ⚠️ L44 Large component is hard to read and change no-giant-component

src/hooks/useCollectedOverlays.ts

• ⚠️ L32 Ref initializer runs on every render rerender-lazy-ref-init

_{Reviewed by React Doctor for commit e806469. See inline comments for fixes.}

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ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between a289ab7 and e806469.

📒 Files selected for processing (1)

• package/android/src/main/java/com/margelo/nitro/nitromaps/ClusterElement+AccessibilityLabel.kt

💤 Files with no reviewable changes (1)

• package/android/src/main/java/com/margelo/nitro/nitromaps/ClusterElement+AccessibilityLabel.kt

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📝 Summary

Summary by CodeRabbit

• Accessibility
  • Cluster markers announce how many markers they contain, with singular or plural wording based on the count. The label is available when cluster markers are added and when existing cluster markers are updated.

Walkthrough

Android cluster markers use their exact member counts in accessibility titles. A plural resource provides singular and plural descriptions. The title is set when a marker is added and updated when a retained marker changes.

Changes

Android cluster labels

Layer / File(s)	Summary
Pluralized cluster marker titles package/android/src/main/res/values/strings.xml, package/android/src/main/java/com/margelo/nitro/nitromaps/ClusterElement+AccessibilityLabel.kt, package/android/src/main/java/com/margelo/nitro/nitromaps/MapOverlayController.kt	The plural resource defines singular and plural cluster descriptions. The accessibility-label extension formats the exact cluster count. New and retained cluster markers use that label as their title.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Low

Merge Risk: ⚪ Minimal · up to e8064

This change adds a TalkBack label that announces the exact member count of Android cluster markers. No concrete merge-blocking risk was found in the supplied context. On-device TalkBack verification has not been done.

🚥 Pre-merge checks | ✅ 5 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the Android accessibility fix and uses the required PR type prefix. It is one character over the preferred 50-character limit, but it remains concise and descriptive.
Description check	✅ Passed	The description directly explains the TalkBack label change, verification results, scope, and known test limitation. It is clearly related to the changeset.
Linked Issues check	✅ Passed	The PR satisfies the coding requirements in #101. Cluster.accessibilityLabel uses the exact count for plural selection and formatting. MapOverlayController applies the title when it adds a clust…
Out of Scope Changes check	✅ Passed	The changes are limited to the Android cluster accessibility label, the cluster add and retained-update paths, and the requested plurals resource. These changes directly implement #101. No unrelated A…
Security Check	✅ Passed	No security vulnerability is introduced. The PR adds a localized label derived from the internally computed cluster count and assigns it to Google Maps marker titles. The count is built from the local…

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Inline comments:
Review comments at
@package/android/src/main/java/com/margelo/nitro/nitromaps/MapOverlayController.kt:
- Line 319: Update the cluster-marker handling around accessibilityLabel so a
changed cluster label recreates the retained marker with
MarkerOptions.contentDescription instead of only updating Marker.title. Preserve
the marker’s position, icon, anchor, tag, cluster state, and bookkeeping when
replacing it.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Plan: Essentials

Run ID: fd6fd576-7944-4584-9749-388e4b6bc5da

📥 Commits

Reviewing files that changed from the base of the PR and between dfd818c and d2482b9.

📒 Files selected for processing (3)

• package/android/src/main/java/com/margelo/nitro/nitromaps/ClusterElement+AccessibilityLabel.kt
• package/android/src/main/java/com/margelo/nitro/nitromaps/MapOverlayController.kt
• package/android/src/main/res/values/strings.xml

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