Check if string is number in android

问题

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

They are accepted as strings which are later converted.

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

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

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

回答1:

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");
}

回答2:

If you are inflating those textviews from xml you can just use:

android:inputType="number"

来源：https://stackoverflow.com/questions/28262475/check-if-string-is-number-in-android