How to validate edit text in android for special characters?

Question

There are so many questions and answers regarding this topic,but my problem is I have edit text in my app,there I need to enter a name,so I need to validate my edit text,to avoid spaces and special characters as the only name,and edit text can't be empty also.How can I do that without textwatcher.

Be specific, u need to validate on each keystroke or after a button click? — Brendon, Oct 22 '15 at 06:33
When I click the add button to add Name,I need to show the error message whenever the field is empty or the field is only with special characters — acer, Oct 22 '15 at 06:42
if(edittext1.matches("")){ e2.setError("Invalid Address"); } add on xml file->android:inputType="textFilter" — Android, Oct 22 '15 at 06:45
1. What are special characters? 2. what you try? 3. You can show keyboard without group of characters/numbers 4. regular expression, like this: ^(?=.{8,20}$)(?![_.])(?!.*[_.]{2})[a-zA-Z0-9._]+(?<![_.])$ from http://stackoverflow.com/questions/12018245/regular-expression-to-validate-username — AsfK, Oct 22 '15 at 06:48

score 4 · Answer 1 · edited Sep 20 '17 at 09:39

4

You can use a simple regular expression

public boolean isValidWord(String word) {

    return word.matches("[A-Za-z][^.]*");
}

if return value is true then your input dont have a special char or spaces.. if false it may have special char or spaces.. simple and elegant..

Just call the method with the string paramater before add your name..

edited Sep 20 '17 at 09:39

Dinithe Pieris

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answered Oct 22 '15 at 06:50

Brendon

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For all other characters,this answer is good,but for the `.` (fullstop symbol) your code is not working – acer Oct 23 '15 at 17:35

score 0 · Answer 2 · answered Oct 22 '15 at 06:57

You can use input filter to filter out special characters and white space

 edittext.setFilters(new InputFilter[] { new InputFilter() {

        @Override
        public CharSequence filter(CharSequence source, int start, int end,
                Spanned dest, int dstart, int dend) {
            String regex = "a-z~@#$%^&*:;<>.,/}{+";
            if(!dest.toString().contains(" ")||!dest.toString().matches("[" + regex + "]+")){
            return null;
            }
        }

    } });

I hope it helps you..

score 0 · Answer 3 · edited Sep 20 '17 at 09:42

0

String username=edittext1.getText().toString();
if(username.matches("")) {
     edittext1.setError("Invalid ");
}

add on xml file

android:inputType="textFilter"

may be it will help

edited Sep 20 '17 at 09:42

PEHLAJ

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answered Oct 22 '15 at 06:59

Android

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Nirav Shah · Answer 4 · 2021-08-03T08:57:19.170

-1

edittext.setFilters(new InputFilter[] { new InputFilter() {

    @Override
    public CharSequence filter(CharSequence source, int start, int end,
            Spanned dest, int dstart, int dend) {
        String regex = "a-z~@#$%^&*:;<>.,/}{+";
        if(!dest.toString().contains(" ")||!dest.toString().matches("[" + regex + "]+")){
        return null;
        }
    }

} });

edited Aug 03 '21 at 08:57

answered Oct 22 '15 at 07:16

Nirav Shah

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10

How to validate edit text in android for special characters?

4 Answers4