How to restrict EditText to only specified characters in android? [closed]

Question

I want to restrict my EditText to only specific characters like (a-z,A-Z,0-9,space,.and some other).

If the user tries to enter some other characters beyond the list,it should not be displayed in edittext.

Is there any way to do this?

Answer 1

Try this:

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))) { 
                  return ""; 
                  } 
           } 
           return null; 
     } 
}; 

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

Check How can I filter ListView data when typing on EditText in android

Answer 2

Here is the solution for you....

Just add the characters to the string which you want to allowed

    final String allowed = "abcdefghijklmnopqrstuvwxyz";
    final EditText editText = (EditText)findViewById(R.id.edit001);
    editText.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

            char currentChar = s.charAt(start);
            System.out.println(currentChar);
            if(allowed.contains(Character.toString(currentChar)))
            {
                //Nothing to do
            }
            else
            {
                editText.setText(editText.getText().toString().substring(0, editText.getText().toString().length()-1));
                int position = editText.length();
                Editable etext = editText.getText();
                Selection.setSelection(etext, position);
            }
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub

        }
    });