AppState 'change' fires redundant 'active' when app is already active the first time the listener is added on Android iOS Prod
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- C++
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描述
Description
On Android and iOS PROD when the AppState listener 'change' is added the very first time it automatically also fires the listener with nextState as "active" even though the app is already "active".
This issue occurs specifically on Prod and not Dev. On Dev it works as expected where the listener is not fired the first time it's added. listener is only fired the first time when the app goes to the background.
EXPECTED BEHAVIOR:
The behavior should be the same with dev and prod where the listener does not automatically fire with 'active' when it's added the very first time.
Steps to reproduce
- Create a new RN app with
npx react-native init androidAppStateIssue - Add the AppState 'change' listener on a button click as follows
const addAppStateListener = () => {
// read 'AppState.currentState' to register current state on prod
// comment, uncomment this console.log to see difference on prod
console.log('INITIAL', AppState.currentState);
AppState.addEventListener('change', nextAppState => {
console.log('nextAppState', nextAppState);
});
};
return (
...
<Button title="addAppStateListener" onPress={addAppStateListener} />
)
- Build on Android/iOS, generate apk/app and install on emulator/simulator (PROD).
- Click the
addAppStateListenerbutton and notice that the listener is NOT automatically fired with "active" when the listener is added. - Comment the line
console.log('INITIAL', AppState.currentState);and rebuild, re-install app. - Click the
addAppStateListenerbutton and notice that the listener IS automatically fired with "active" when the listener is added
React Native Version
0.74.3 (current latest)
Affected Platforms
Other (please specify)
Android and iOS PROD
Output of npx react-native info
System:
OS: macOS 14.5
CPU: (10) arm64 Apple M1 Pro
Memory: 89.75 MB / 32.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 18.20.4
path: ~/.nvm/versions/node/v18.20.4/bin/node
Yarn:
version: 1.22.22
path: ~/.nvm/versions/node/v18.20.4/bin/yarn
npm:
version: 10.7.0
path: ~/.nvm/versions/node/v18.20.4/bin/npm
Watchman:
version: 2023.12.04.00
path: /opt/homebrew/bin/watchman
Managers:
CocoaPods:
version: 1.12.1
path: /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 23.2
- iOS 17.2
- macOS 14.2
- tvOS 17.2
- visionOS 1.0
- watchOS 10.2
Android SDK:
API Levels:
- "33"
- "34"
Build Tools:
- 30.0.3
- 33.0.0
- 33.0.1
- 34.0.0
System Images:
- android-33 | Google APIs ARM 64 v8a
- android-34 | Google APIs ARM 64 v8a
- android-35 | Google Play ARM 64 v8a
Android NDK: Not Found
IDEs:
Android Studio: 2022.3 AI-223.8836.35.2231.10671973
Xcode:
version: 15.2/15C500b
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.9
path: /Users/ashwsrir/.jenv/shims/javac
Ruby:
version: 2.6.10
path: /usr/bin/ruby
npmPackages:
"@react-native-community/cli": Not Found
react:
installed: 18.2.0
wanted: 18.2.0
react-native:
installed: 0.74.3
wanted: 0.74.3
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: true
newArchEnabled: false
iOS:
hermesEnabled: true
newArchEnabled: false
Stacktrace or Logs
When listener is added for the first time in dev vs prod. (make sure to comment the console.log('INITIAL', AppState.currentState)on app)
dev
Running "androidAppStateIssue
listener is added
prod
Running "androidAppStateIssue
listener is added
nextAppState', 'active' <== additional event fired
Reproducer
https://github.com/ashwinkumar6/androidAppStateIssue
Screenshots and Videos
No response
贡献指南
从这里开始
- 先读完整个 Issue,再读项目的贡献指南。
- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- Fork 仓库,在一个分支上完成修改。
- 提交 Pull Request,并在描述里引用这个 Issue 编号。
调研方向
先从 React Native 0.74.3 实现中的 AppState.addEventListener 和 AppState.currentState 行为开始,然后使用链接的 androidAppStateIssue 示例,在 development 和 production build 中重现该问题。跟踪 Android 和 iOS 上的第一次 listener 注册,并验证当应用已经处于 active 状态时,添加它不会发出不必要的 active 事件。
由索引模型根据 Issue 内容生成。
评估
- 技术栈
- android, ios, javascript, react-native
- 领域
- mobile
- Issue 类型
- 缺陷
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 活跃度
- 停滞
- 描述清晰度
- 基本清楚
- 新手友好度
- 35/100