react / react/react-native

[Android][Animation] Interpolated translateY value causes android view to jump.

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Bug Platform: Android Priority: Mid
Dominant language
C++
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Description

Environment

React Native Environment Info:
System:
OS: macOS 10.14
CPU: x64 Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
Memory: 862.68 MB / 16.00 GB
Shell: 3.2.57 - /bin/sh
Binaries:
Node: 10.9.0 - ~/.nvm/versions/node/v10.9.0/bin/node
Yarn: 1.10.1 - ~/.nvm/versions/node/v10.9.0/bin/yarn
npm: 6.2.0 - ~/.nvm/versions/node/v10.9.0/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
SDKs:
iOS SDK:
Platforms: iOS 11.2, macOS 10.13, tvOS 11.2, watchOS 4.2
IDEs:
Android Studio: 3.1 AI-173.4819257
Xcode: 9.2/9C40b - /usr/bin/xcodebuild
npmPackages:
react: 16.6.0-alpha.8af6728 => 16.6.0-alpha.8af6728
react-native: ^0.57.3 => 0.57.3
npmGlobalPackages:
react-native-cli: 2.0.1

Description

I'm trying to implement collapsible header using React Native Animated API. using event method i get AnimatedHeaderValue and interpolate it into translateY value.
This value i apply to container of my listView (so listView moves vertically).
IOS animation works perfectly, but Android animation jumping and lagging when i scroll. I tried to inscrease scroll value and Android animation became more smooth.

This is scrollView container that passes onScroll to scrollView (listView)

<ScCompanyNewsFeedList optimizeHeight getRef={scrollView => { console.log("SCROLL VIEW", scrollView) this._scrollView = scrollView; }} scrollEventThrottle = { 2 } onScroll={Animated.event( [{ nativeEvent: { contentOffset: { y: this.AnimatedHeaderValue }}}], )} companyId={this.props.companyId}/> }

this is base container that contains tabs and my scrollView. It's moving when scroll.

<Animated.View style={[{flex: 1}, {transform: [{translateY: headerHeight}]}]}> ... </Animated.View>

Interpolation

const animationRange = this.AnimatedHeaderValue.interpolate({ inputRange: [0, scrollRange], outputRange: [0, 1], extrapolate: "clamp" }); const headerHeight2 = animationRange.interpolate({ inputRange: [0, 1], outputRange: [0, -200] });

Contributor guide

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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

The reported entry points are React Native's Animated API, Animated.event on the scroll view, and interpolated translateY on an Animated.View; begin by reproducing the Android case from the supplied snippet. Done means scrolling no longer causes the Android view to jump or lag while the equivalent iOS behavior remains intact.

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
Quiet
Clarity
Mostly clear
Newbie friendliness
35/100

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