Android: Restricting textfield to one decimal point

Question

How to restrict an EditText Field to only one decimal point. Let's say the user should enter only one digit/number after the (.)[decimal].

User enters : 1.92 [Its invalid] User enters : 1.9 [Its Valid]

Below is the regular expression i am using.

mPattern = Pattern.compile("[0-9]*+((\\.[0-9]{0," + (digitsAfterZero - 1) + "})?)||(\\.)?");

I am having problems with the decimals, user if enter 23.1 its fine, but the same user can enter 2.31.

How can i restrict user to enter only one number/digit after decimal.

This question covers quite the same issue with the decimal restriction. Including solutions with `RegEx` and the `InputFilter Interface`. http://stackoverflow.com/questions/5357455/limit-decimal-places-in-android-edittext — Steve Benett, Jun 16 '13 at 11:55

score 3 · Answer 1 · answered Jun 16 '13 at 12:30

How about using a regular expression for that..

public class DecimalDigitsFilter implements InputFilter {

Pattern pattern;

public DecimalDigitsFilter(int digitsBeforeZero,int digitsAfterZero) {
    pattern=Pattern.compile("[0-9]{0," + (digitsBeforeZero-1) + "}+((\\.[0-9]{0," + (digitsAfterZero-1) + "})?)||(\\.)?");
}

@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned destination, int destinationStart, int destinationEnd) {

    Matcher matcher=pattern.matcher(destination);       
    if(!matcher.matches())
        return "";
    return null;
   }
}

And then call it as..

editText.setFilters(new InputFilter[] {new DecimalDigitsFilter(5,1)}); //5 before point and 1 after point.Change it as your need

score 0 · Answer 2 · answered Jun 16 '13 at 11:46

0

Add TextWatcher to the textView and use it's methods to prevent typing after dot more then one number.

answered Jun 16 '13 at 11:46

Lingviston

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Android: Restricting textfield to one decimal point

2 Answers2