android - 如何在字符串资源中使用十进制数(Double 数据类型)作为占位符

Question

我想在字符串资源中的占位符内使用超过 1 种数据类型，但每当我尝试使用小数作为数值时，都会返回错误。

Kotlin

val currentLocale = Locale.getDefault()
val distanceWalked = 5.2
val numberFormatter: NumberFormat
val amountOut: String
numberFormatter = NumberFormat.getNumberInstance(currentLocale)
amountOut = numberFormatter.format(distanceWalked)

tv.txt = getString(R.string.distance_decimalnumber_placeholder,amountOut,"*")

搅拌资源

<string name="distance_decimalnumber_placeholder">You have walked %1$d%2$s metres</string>

预期结果

你已经走了 5.2* 米

错误

java.util.IllegalFormatConversionException: d != java.lang.Double

Wrong argument type for formatting argument '#1' in distance_decimalnumber_placeholder: conversion is 'd', received String (argument #2 in method call)

Answer 1

第一个错误d用于整数

问题:

您已在以下位置转换为字符串:amountOut = numberFormatter.format(distanceWalked)你现在需要用字符串替换

解决方法:不需要使用$f您需要使用 $s

tv.txt = getString(R.string.distance_decimalnumber_placeholder,amountOut /* this is a string also*/ ,"*")
<string name="distance_decimalnumber_placeholder">You have walked %1$s%2$s metres</string>