How to detect special characters in an edit text and display a Toast in response (Android)?

Question

An apology for my bad English, I\'m using google translate.

I\'m creating an activity in which users must create a new profile. I put a limit to edit text of 15 char

Answer 1

use the the following line in edittext in xml file so that it only enters the alphabets and numbers;

 android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

If you need dynamic response use textwatcher for your edittext;

   yourEditText.addTextChangedListener(new TextWatcher() {

      public void afterTextChanged(Editable s) {

       // Here you need to check special character, if found then show error message

      if (s.toString().contains("%"))
      {
           // Display error message
      }

      public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

      public void onTextChanged(CharSequence s, int start, int before, int count) {}
   });