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⚡ Bolt: optimize SosActivityLogScreen list virtualization - #315

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bolt-optimize-activity-log-sliver-14462033467654231595
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⚡ Bolt: optimize SosActivityLogScreen list virtualization#315
NITISH-R-G wants to merge 2 commits into
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bolt-optimize-activity-log-sliver-14462033467654231595

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@NITISH-R-G

@NITISH-R-G NITISH-R-G commented Aug 16, 2026

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💡 What:
Migrates the SosActivityLogScreen layout from a standard ListView that renders dynamic history items within a single synchronous Column over to a CustomScrollView leveraging SliverList.builder.

🎯 Why:
The previous implementation used items.map(...).toList() inside a Column which was then placed into a ListView. This approach completely bypasses Flutter's list virtualization mechanics. When viewing the SOS activity history, every single incident was being built, laid out, and painted immediately upon screen load, regardless of whether they were visible on screen. This creates a significant memory footprint and a potential frame drop (jank) spike on load, especially for users with a large history.

📊 Impact:

  • Performance: Changes rendering complexity from O(n) (where n is the total number of history records) to O(1) (rendering only the few items actively visible on the screen).
  • Memory: Significantly reduces memory allocations by lazily constructing widgets.
  • Responsiveness: Noticeably faster screen initialization and smoother scrolling behaviour.

🔬 Measurement:
Run flutter test to verify rendering logic and routing remains correct. Navigate to the Activity Log screen on a physical device using the Flutter DevTools performance overlay to observe the reduction in initial build time/frame rendering time.


PR created automatically by Jules for task 14462033467654231595 started by @NITISH-R-G

Summary by Sourcery

Optimize SosActivityLogScreen to use sliver-based scrolling for SOS activity history to improve performance and memory usage.

Enhancements:

  • Replace ListView with CustomScrollView and sliver-based layout for the SOS activity log screen.
  • Virtualize SOS incident history items using SliverList.builder instead of eagerly building all items in a Column.

Replaces the standard `ListView` and `Column` structure in the
`SosActivityLogScreen` with a `CustomScrollView` and a lazily built
`SliverList.builder`. This prevents the entire history of SOS records
from being built and laid out simultaneously, achieving an O(1)
rendering complexity for visible items rather than O(n) rendering for
the entire dataset.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information

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Reviewer's Guide

Migrates SosActivityLogScreen from a non-virtualized ListView/Column layout to a sliver-based CustomScrollView with virtualized SliverList, preserving existing UI semantics while improving performance and memory usage.

File-Level Changes

Change Details Files
Replace the ListView + Column-based SOS activity log layout with a CustomScrollView using slivers for proper list virtualization.
  • Wrap the screen body in CustomScrollView instead of ListView.
  • Introduce top SliverPadding with SliverChildListDelegate for static header, current session, and section title content.
  • Introduce bottom SliverPadding containing the history AsyncValue rendered as slivers, including saved incidents list or empty-state text.
lib/ui/sos_activity_log_screen.dart
Virtualize the incident history list using SliverList.builder and adapt loading/error states to sliver-compatible widgets.
  • Replace Column + items.map(...) history rendering with SliverList.builder that lazily builds _historyCard for each item.
  • Handle empty history with SliverToBoxAdapter containing the informational Text message.
  • Convert loading and error UI from regular widgets to SliverToBoxAdapter children to integrate into CustomScrollView.
lib/ui/sos_activity_log_screen.dart
Update dependency lockfile to reflect the current Flutter/Dart package state associated with this change.
  • Regenerate pubspec.lock as part of the build/tooling process.
pubspec.lock

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Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information

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