Check blank space when clicking in a EditText

Question

I have a customized EditText class, whats is happening is that there is a validation already for the field, checking it's length and doing trim.

But, the app is crashing because it is possible to click in the field and insert data after 1 space.

How can I validate when clicking, that user can not write his data? If he/she writes data with one space, the app crashes and I receive the following exception.

java.lang.IllegalArgumentException: Start position must be less than the actual text length

Thanks in advance.

Can you post the code where the error occur? – GhostDerfel Feb 03 '14 at 13:03 — GhostDerfel, Feb 03 '14 at 13:03

score 1 · Accepted Answer · edited May 23 '17 at 11:52

1

Either you can trim but remember this wont restrict to enter white spaces by user, If you want to restrict white spaces then you need to add filter for your edit text. Adding filter let you restrict what ever character you want to avoid.

P.S - Check for adding filter on given link How do I use InputFilter to limit characters in an EditText in Android?

edited May 23 '17 at 11:52

Community

1
1

answered Feb 03 '14 at 13:10

Daud Arfin

2,499
1
18
37

Arfin, thanks... I already have a mask for this. How can I create this filter? – Leonardo Leonardo Feb 03 '14 at 13:13
go through this given link http://stackoverflow.com/questions/3349121/how-do-i-use-inputfilter-to-limit-characters-in-an-edittext-in-android – Daud Arfin Feb 04 '14 at 07:17

score 1 · Answer 2 · answered Feb 03 '14 at 13:17

add "addTextChangedListener" to your EditText and then onTextChanged you can check for your validation. For example,

txtEdit.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // TODO Auto-generated method stub
            String str = s.toString();
            if(str.length() > 0 && str.startsWith(" ")){
                Log.v("","Cannot begin with space");
                txtEdit.setText("");
            }else{
                Log.v("","Doesn't contain space, good to go!");
            }
        }

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

        }

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

        }
    });

Atul, the problem is that no text has changed. The app is crashing when user clicks and left space in the field. — Leonardo Leonardo, Feb 03 '14 at 19:55
@Leonardo, could you please paste some of your code, that will help understand the issue better? — Atul O Holic, Feb 03 '14 at 20:26

Harshal Benake · Answer 3 · 2014-02-03T13:17:26.117

0

trim the string that you get from edit text.

   String str=edtext.getText().toString().trim();


if(str!=null && !str.equalsIgnoreCase("")))
{
//perform your operations. 
}
else
{
//give error message.
}

edited Feb 03 '14 at 13:17

answered Feb 03 '14 at 13:05

Harshal Benake

2,391
1
23
40

Forgot to say but I'm already doing this validation. final int number = Integer.parseInt(formNumber.getTextField() .getText().toString().trim()); – Leonardo Leonardo Feb 03 '14 at 13:07

score 0 · Answer 4 · answered Feb 03 '14 at 13:10

Get the edit text first by this way:

EditText name=(EditText) findViewById(R.id.txt);
String txtEdit=txt.getEditableText().toString();

then check the text length validation by:

if(txtEdit.length() == 0)  {

               //your code for what you want to do.

}

Check blank space when clicking in a EditText

4 Answers4