Validation allow only number and characters in edit text in android

Question

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

Here is my code:

edit         


        

Answer 1

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

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

Answer 2

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 });

Answer 3

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.

Answer 4

<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"
/>

Answer 5

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.

Answer 6

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