meliorence / meliorence/react-native-snap-carousel

Scrolling on android appears to get stuck between views unless moved slowly

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JavaScript
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Description

Is this a bug report, a feature request, or a question?

Bug Report

Have you followed the required steps before opening a bug report?

(Check the step you've followed - put an x character between the square brackets ([]).)

Have you made sure that it wasn't a React Native bug?

Yes

Is the bug specific to iOS or Android? Or can it be reproduced on both platforms?

Android

Is the bug reproductible in a production environment (not a debug one)?

I have confirmed this by building the android app with NODE_ENV=production in my env file, yes.

Environment

Environment:
React: 17.0.1
React native: 0.64.2
react-native-snap-carousel: 3.9.1

Target Platform:
Android (12.5.3)

Expected Behavior

Swiping between views on Android should snap to the next view when released.

Actual Behavior

If I swipe with some (pretty normal) momentum, the carousel will get stuck between 2 pages, and not call the onSnapToItem method.
If I swipe slowly and release about halfway, it perfectly snaps perfectly to the next page.
I am aware of the performance issues on android and have tried many props/settings and fixes found in various places on the internet and in the issues here, apologies if I've missed something very common.

Reproducible Demo

(Paste the link to a Snack example in which the issue can be reproduced. Please follow the guidelines for providing a Minimal, Complete, and Verifiable example.)

Steps to Reproduce

These are the current settings after all my efforts.

          <Carousel
            scrollEnabled={calendarState === CalendarState.Open}
            firstItem={prevMonths}
            data={monthData}
            sliderWidth={calendarWidth}
            itemWidth={calendarWidth}
            inactiveSlideOpacity={0.5}
            inactiveSlideScale={0.8}
            inactiveSlideShift={0}
            removeClippedSubviews={false}
            lockScrollWhileSnapping={isAndroid}
            enableMomentum={false}
            disableIntervalMomentum
            enableSnap
            onSnapToItem={onMonthChanged}
            renderItem={renderItem}
          />

https://user-images.githubusercontent.com/83917938/140102710-343fc1d4-5cc4-450a-8041-dd1ebec5324f.mp4

I am using the carousel to create a calendar, each page is a "month" containing rows of weeks, containing 7 days, there is a lot of elements here when you consider we have potentially 42 "days" per month/page and in my case, up to 7 months at a time....

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No source file or test is named. Start by reproducing the Android swipe behavior with the provided Carousel settings and video, then trace the carousel's snapping and momentum handling; done means a normal swipe consistently snaps to one view and calls onSnapToItem.

Written by the indexing model from the issue text.

Assessment

Tech stack
android, javascript, react-native
Domain
mobile-dev
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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