Auto remove leading space of any text of EditText?

Question

Description

I am developing one app in which I have registration page. Inside registration page, I am doing registration by getting user\'s full nam

Answer 1

First, try to understand what he is trying to do

He is trying to prevent user typing leading spaces and not after entering text.

He doesn't want to trim username

Update your code from

if(str.length() > 0 && str.contains(" "))
                {
                    user_name.setError("Space is not allowed");
                    user_name.setText("");
                }

to

if(str.equals(" "))
                {
                    user_name.setError("Leading Space is not allowed");
                    user_name.setText("");
                }

It will prevent user typing any space before name

Answer 2

Use trim() method to remove the extra space

user_name.getText().toString().trim().

And Remove

if(str.length() > 0 && str.contains(" "))
                {
                    user_name.setError("Space is not allowed");
                    user_name.setText("");
                }

from your onTextChanged

To prevent user from entering space add this on your onTextChanged

if(str.equals(" "))
                {
                    user_name.setError("Leading Space is not allowed");
                    user_name.setText("");
                }

Answer 3

use this trim() method to remove the space like this..

String str = s.toString().trim();

Answer 4

Try this, check if start == 0, it will not allow user to add spaces before name

@Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if(start == 0 && s.toString().contains(" ")){
                user_name.setText("");
            }
        }