How can I format a String number to have commas in android Edit Field

Question

For what function I can use in android to display the number into different formats.

For eg: If I enter 1000 then it should display like this 1,000. If I enter 1000

Answer 1

Add a text change listener as below (Also make sure that the input type selected for Edittext is Number) :

etTest.addTextChangedListener(new TextWatcher() {

        boolean isManualChange = false;

        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            if (isManualChange) {
                isManualChange = false;
                return;
            }

            try {
                String value = s.toString().replace(",", "");
                String reverseValue = new StringBuilder(value).reverse()
                        .toString();
                StringBuilder finalValue = new StringBuilder();
                for (int i = 1; i <= reverseValue.length(); i++) {
                    char val = reverseValue.charAt(i - 1);
                    finalValue.append(val);
                    if (i % 3 == 0 && i != reverseValue.length() && i > 0) {
                        finalValue.append(",");
                    }
                }
                isManualChange = true;
                etTest.setText(finalValue.reverse());
                etTest.setSelection(finalValue.length());
            } catch (Exception e) {
                // Do nothing since not a number
            }
        }

        @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

        }
    });