Android TextInput placeholder with custom font has incorrect height
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描述
Description
TextInput placeholders that do not use the default android font and differ in their wrap point from the default font may be cut off. For example, if the default font does not wrap, and the custom font is slightly wider and does wrap to the next line, the placeholder will NOT reflect this wrapping, and the TextInput will only be one line.
React Native version:
System:
OS: macOS 11.2.3
CPU: (8) x64 Intel(R) Core(TM) i7-1068NG7 CPU @ 2.30GHz
Memory: 91.84 MB / 32.00 GB
Shell: 5.8 - /bin/zsh
Binaries:
Node: 16.0.0 - /usr/local/bin/node
Yarn: 1.22.10 - /usr/local/bin/yarn
npm: 7.10.0 - /usr/local/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.10.1 - /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms: iOS 14.4, DriverKit 20.2, macOS 11.1, tvOS 14.3, watchOS 7.2
Android SDK:
API Levels: 28, 29, 30
Build Tools: 28.0.3, 29.0.2, 30.0.3, 31.0.0
System Images: android-30 | Google APIs Intel x86 Atom
Android NDK: Not Found
IDEs:
Android Studio: 4.1 AI-201.8743.12.41.6953283
Xcode: 12.4/12D4e - /usr/bin/xcodebuild
Languages:
Java: 11.0.10 - /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: 17.0.1 => 17.0.1
react-native: 0.64.1 => 0.64.1
react-native-macos: Not Found
npmGlobalPackages:
*react-native*: Not Found
Steps To Reproduce
- Create text input with placeholder string that does not wrap with default font, but does wrap with custom font.
- Second line will not be visible.
Expected Results
Placeholder should adjust height according to its font.
Snack, code example, screenshot, or link to a repository:
https://snack.expo.io/@computerjazz/textinput-android-bug
expected behavior (in this case placeholder text is long enough that it ALSO would wrap using default font)

actual behavior (placeholder text using "serif" font wraps to a 3rd line, but if it were to use the default font it would not wrap, and as a result placeholder gets cut off):

For reference, here's the same text using default font, note that it does not wrap to a 3rd line:

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
使用自定义衬线字体和一个与默认字体换行方式不同的占位符,通过链接的 Snack 重现换行差异。然后跟踪负责占位符尺寸计算的 Android React Native TextInput 实现,并验证占位符高度包含所有换行后的行。
由索引模型根据 Issue 内容生成。
评估
- 技术栈
- android, 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
- 38/100