检查字符串是否为android中的数字 [英] Check if string is number in android

问题描述

我有三个文本字段，它们都是数字或十进制数字.

I have three text fields all which are numbers or a decimal number.

它们被接受为字符串，以后将被转换.

They are accepted as strings which are later converted.

但是，我想验证这些字段，以便仅接受数字或十进制数字.

However, i want to validate these fields so that only the numbers or decimal numbers are accepted.

确保这些字段仅为字符0-9的最简单方法是什么.

Whats the easiest way to ensure that these fields are only characters 0-9.

我希望使用if语句，但是任何解决方案都不错！

I would prefer an if statement but any solution would be nice!

推荐答案

使用 string.matches 方法，该方法接受正则表达式作为参数.

Use string.matches method which accepts a regex as an argument.

if(string.matches("\\d+(?:\\.\\d+)?"))
{
System.out.println("Matches");
}
else
{
System.out.println("No Match");
}

这篇关于检查字符串是否为android中的数字的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！