英文:
How we can we format Text as superscript or subscript in Android Jetpack Compose UI?
问题
我正在使用Android Jetpack Compose示例中，我正在显示一些文本方程式，如下所示：
<body>
<!-- 上标 -->
<p> E = mc<sup>2</sup></p>
<!-- 下标 -->
<p> CH<sub>4</sub> + H<sub>2</sub>O = CO + 3H<sub>2</sub></p>
</body>
</html>
是否存在任何文本装饰或样式机制，我可以使用它来实现相同的输出？
英文:
I am working on one example using Android Jetpack Compose, where I am displaying some text equations like below :
<html>
<body>
<!-- Superscript-->
<p> E = mc<sup>2</sup></p>
<!--Subscript-->
<p> CH<sub>4</sub> + H<sub>2</sub>O = CO + 3H<sub>2</sub></p>
</body>
</html>
Does there any decoration or style mechanism exist for Text that I can use to achieve the same output?
答案1
得分: 20
更新： 请参考此处提到的新答案：https://stackoverflow.com/a/66801935/2949612
使用 BaselineShift，我们可以为 Text 小部件使用 Span，这允许装饰文本作为上标或下标。
以下是实现上述输出的工作代码：
@Composable
fun Equations(name: String) {
val defaultStyle = TextStyle(fontSize = 20.sp,
color = Color.White)
val scriptStyleSuper = TextStyle(
baselineShift = BaselineShift.Superscript,
fontSize = 12.sp,
color = Color.Green)
val scriptStyleSub = TextStyle(
baselineShift = BaselineShift.Subscript,
fontSize = 12.sp,
color = Color.Green)
Text {
Span(text = "E = mc", style = defaultStyle) {
Span(
text = "2",
style =scriptStyleSuper
) {
Span(text = "\n")
Span(text = "CH", style = defaultStyle)
Span(text = "4 ",style = scriptStyleSub)
Span(text = "+ H", style = defaultStyle)
Span(text = "2",style = scriptStyleSub)
Span(text = "O = CO + 3H", style = defaultStyle)
Span(text = "2",style = scriptStyleSub)
}
}
}
}
输出：
要查看更多信息，请访问：https://developer.android.com/reference/kotlin/androidx/compose/ui/text/style/package-summary
英文:
UPDATE: Please refer new answer mentioned here: https://stackoverflow.com/a/66801935/2949612
Using BaselineShift, we can use Span for Text widget, which allows to decorate text as subscript or superscript.
Below is the working code to achieve the above output:
@Composable
fun Equations(name: String) {
val defaultStyle = TextStyle(fontSize = 20.sp,
color = Color.White)
val scriptStyleSuper = TextStyle(
baselineShift = BaselineShift.Superscript,
fontSize = 12.sp,
color = Color.Green)
val scriptStyleSub = TextStyle(
baselineShift = BaselineShift.Subscript,
fontSize = 12.sp,
color = Color.Green)
Text {
Span(text = "E = mc", style = defaultStyle) {
Span(
text = "2",
style =scriptStyleSuper
) {
Span(text = "\n")
Span(text = "CH", style = defaultStyle)
Span(text = "4 ",style = scriptStyleSub)
Span(text = "+ H", style = defaultStyle)
Span(text = "2",style = scriptStyleSub)
Span(text = "O = CO + 3H", style = defaultStyle)
Span(text = "2",style = scriptStyleSub)
}
}
}
}
Output:
To check more info: https://developer.android.com/reference/kotlin/androidx/compose/ui/text/style/package-summary
答案2
得分: 12
你可以使用BaselineShift.Superscript和BaselineShift.Subscript来定义一个SpanStyle。
类似这样：
val superscript = SpanStyle(
baselineShift = BaselineShift.Superscript,
fontSize = 16.sp,
color = Color.Red
)
val subscript = SpanStyle(
baselineShift = BaselineShift.Subscript,
fontSize = 16.sp,
color = Color.Blue
)
然后，你可以使用AnnotatedString来显示具有多种样式的文本。
类似这样：
Text(
fontSize = 20.sp,
text = buildAnnotatedString {
append("E = mc")
withStyle(superscript) {
append("2")
}
}
)
和
Text(
fontSize = 20.sp,
text = buildAnnotatedString {
append("CH")
withStyle(subscript) {
append("4")
}
append(" + H")
withStyle(subscript) {
append("2")
}
append("O = CO + 3H")
withStyle(subscript) {
append("2")
}
}
)
和
Text(
fontSize = 20.sp,
text = buildAnnotatedString {
append("CH")
withStyle(subscript) {
append("4")
}
append(" + H")
withStyle(subscript) {
append("2")
}
append("O = CO + 3H")
withStyle(subscript) {
append("2")
}
}
)
英文:
You can define a SpanStyle using the BaselineShift.Superscript and BaselineShift.Subscript.
Something like:
val superscript = SpanStyle(
baselineShift = BaselineShift.Superscript,
fontSize = 16.sp,
color = Color.Red
)
val subscript = SpanStyle(
baselineShift = BaselineShift.Subscript,
fontSize = 16.sp,
color = Color.Blue
)
Then you can use the AnnotatedString to display the
text with multiple styles.
Something like:
Text(
fontSize = 20.sp,
text = buildAnnotatedString {
append("E = mc")
withStyle( superscript) {
append("2")
}
}
)
and
Text(
fontSize = 20.sp,
text = buildAnnotatedString {
append("CH")
withStyle( subscript) {
append("4")
}
append(" + H")
withStyle( subscript) {
append("2")
}
append("O = CO + 3H")
withStyle( subscript) {
append("2")
}
}
)
答案3
得分: 0
请直接使用Unicode，每个符号都可以找到一个Unicode。
英文:
Please use unicode directly, for every symbol you will be able to find one unicode.
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