CODEWITHSUNDEEP
android
kanna
kanna

Reputation: 463

Validation allow only number and characters in edit text in android

In my application I have to validate the EditText. It should only allow character, digits, underscores, and hyphens.

Here is my code:

edittext.addTextChangedListener(new TextWatcher() {
                                        
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // TODO Auto-generated method stub                              
    }
                                        
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // TODO Auto-generated method stub
    }
                                        
    @Override
    public void afterTextChanged(Editable s) {
        // validation codes here
                                
        location_name=s.toString();
        Toast.makeText(getApplicationContext(),location_name, Toast.LENGTH_SHORT).show();                
        
        if (location_name.matches(".*[^a-z^0-9].*")) {
            location_name = location_name.replaceAll("[^a-z^0-9]", "");
            s.append(location_name);
            s.clear();
            Toast.makeText(getApplicationContext(),"Only lowercase letters and numbers are allowed!",Toast.LENGTH_SHORT).show();
        }                                   
    }

});     
                                    
location.add(location_name);

When I enter input into EditText, the application is force closed.

Upvotes: 37

Views: 95967

Answers (10)

Anubhav
Anubhav

Reputation: 2190

In Kotlin you can do something like this,

val pattern = Regex("[a-zA-Z0-9_-]")
edtText.filters = arrayOf(InputFilter { source, _, _, _, _, _ ->
        source.filter { pattern.matches(it.toString()) }
    })

Upvotes: 0

Saeid Mohammadi
Saeid Mohammadi

Reputation: 449

InputFilter filter = new InputFilter() {
    public CharSequence filter(CharSequence source, int start,
        int end, Spanned dest, int dstart, int dend) {

        for (int i = start; i < end; i++) {
            if (!Character.toString(source.charAt(i)).matches("[a-zA-Z0-9-_]+")) {
                return "";
                edittext.setError("Only letters, digits, _ and - allowed");
            }
        }
        return null;
    }
};
edittext.setFilters(new InputFilter[] { filter });

Upvotes: 4

redbeam_
redbeam_

Reputation: 507

A solution similar to the android:digits="0123456789*", is to use this:

EditText etext = new EditText(this);
etext.setKeyListener(DigitsKeyListener.getInstance("0123456789*"));

An added bonus is that it also displays the numeric keypad.

Upvotes: 5

Tarit Ray
Tarit Ray

Reputation: 994

You can validate this by two ways , both worked for me, hope will be helpful for you too.

1> Mentioning the chars in your edittext .

android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-"

2> Can validate pragmatically as answered by milos pragmatically

Upvotes: 1

Milos Cuculovic
Milos Cuculovic

Reputation: 20223

Instead of using your "manual" checking method, there is something very easy in Android:

InputFilter filter = new InputFilter() { 
    public CharSequence filter(CharSequence source, int start,
                               int end, Spanned dest, int dstart, int dend) { 

        for (int i = start;i < end;i++) { 
            if (!Character.isLetterOrDigit(source.charAt(i)) && 
                !Character.toString(source.charAt(i)).equals("_") && 
                !Character.toString(source.charAt(i)).equals("-")) 
            { 
                return ""; 
            } 
        } 
        return null; 
    } 
}; 

edittext.setFilters(new InputFilter[] { filter });

Or another approach: set the allowed characters in the XML where you are creating your EditText:

<EditText 
  android:inputType="text" 
  android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-" 
  android:hint="Only letters, digits, _ and - allowed" />

Upvotes: 82

Philip Brito
Philip Brito

Reputation: 5599

This can be useful, especially if your EditText should allow diacritics (in my case, Portuguese Diacritic):

<EditText
   android:digits="0123456789AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZzÁáÂâÃãÀàÇçÉéÊêÍíÓóÔôÕõÚú"
/>

Upvotes: 14

dinesh sharma
dinesh sharma

Reputation: 3332

<EditText 
  android:inputType="text" 
  android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-" 
  android:hint="Only letters, digits, _ and - allowed"
/>

the above code will also include , additionally to avoid , use the following code

<EditText 
  android:inputType="text" 
  android:digits="0123456789qwertzuiopasdfghjklyxcvbnm_-"
  android:hint="Only letters, digits, _ and - allowed"
/>

Upvotes: 20

Sanket Kachhela
Sanket Kachhela

Reputation: 10866

use this 2 function

public static boolean isdigit(EditText input)
    {

    String data=input.getText().toString().trim();
    for(int i=0;i<data.length();i++)
    {
         if (!Character.isDigit(data.charAt(i)))
                return false;

    }
    return true;
    }

    public static boolean ischar(EditText input)
    {

    String data=input.getText().toString().trim();
    for(int i=0;i<data.length();i++)
    {
         if (!Character.isDigit(data.charAt(i)))
                return true;

    }
    return false;
    }

pass Edittext variable in these function .. so you can have boolean value.

Upvotes: 0

itsrajesh4uguys
itsrajesh4uguys

Reputation: 4638

please try adding the android:digits="abcde.....012345789" attribute? although the android:digits specify that it is a numeric field it does work for me to set it to accept letters as well, and special characters as well (tested on SDK-7)

Upvotes: 1

TNR
TNR

Reputation: 5869

Try this:

public static SpannableStringBuilder getErrorMsg(String estring) {
        int ecolor = Color.BLACK; // whatever color you want
        ForegroundColorSpan fgcspan = new ForegroundColorSpan(ecolor);
        SpannableStringBuilder ssbuilder = new SpannableStringBuilder(estring);
        ssbuilder.setSpan(fgcspan, 0, estring.length(), 0);
        return ssbuilder;
    }

Then setError() to EditText when you want show 'only Letters and digits are allowed' as below.

etPhone.setError(getErrorMsg("Only lowercase letters and numbers are allowed!"));

Hope this will help you. I use the same for Validation Check in EditText in my apps.

Upvotes: 1

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