How can I set an Input Filter to accept only BINARY characters (0 or 1) on Android?

Question

Here is my current code which only allows integers. I want to restrict the user even more to only allow 0s and 1s. I wish it were as simple as !Character.isBinary(..), but it isn't. How can I manipulate the start and end parameters to accomplish this?

final InputFilter binaryOnlyFilter = new InputFilter() {
        @Override
        public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
            for ( int i = start; i < end; i++) {
                if (!Character.isDigit(source.charAt(i)) && source.charAt(i) != ' ') {
                    return "";
                }
            }
            return null;
        }
};

In that case try this answer http://stackoverflow.com/a/26057532/1852441 just replace `if(cs.toString().matches("[a-zA-Z ]+")){` with `if(cs.toString().matches("[01 ]+")){` — Jaswanth Manigundan, Jul 20 '16 at 23:55
This works perfectly! Thank you! (If you add your comments as an answer, I can mark it as such) — parker_codes, Jul 21 '16 at 02:37

score 2 · Accepted Answer · edited May 23 '17 at 12:24

2

1) If you just want 0's and 1's , add android:digits="01" in your edit text

2) If you want to add some space as well, then try this answer

stackoverflow.com/a/26057532/1852441

in that answer, just replace

if(cs.toString().matches("[a-zA-Z ]+")){

with

if(cs.toString().matches("[01 ]+")){

edited May 23 '17 at 12:24

Community

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answered Jul 21 '16 at 02:51

Jaswanth Manigundan

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How can I set an Input Filter to accept only BINARY characters (0 or 1) on Android?

1 Answers1