Java – decimalformat deletes zeros after a dot

I want to format the user's input, it doesn't matter, but when I try to delete it by clicking decimal format, I enter zero

DecimalFormat df = new DecimalFormat("#,###.##");
 Number n = df.parse(v);
 amountEdit.setText(df.format(n));

Example I / O:

9.0 – > 9.

9.9 – > 9.9

9.90 – > 9.9

It deleted zero!

Edit:

I have EditText and textchangedlistener. The idea is to format the user's input, such as 999 999.99 (this is the maximum value)

amountEdit.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s,int start,int count,int after) {

        }

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

            if (data.document.isPaymentPossible) {

                if (s.toString().contains(String.valueOf(df.getDecimalFormatSymbols().getDecimalSeparator())) || s.toString().contains(".")) {
                    hasDot = true;
                } else {
                    hasDot = false;
                }
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
            String string = s.toString().replaceAll("\\.",",");

            if (string.equals(",") || string.equals(".")) {
                amountEdit.setText("");
                return;
            }

            amountEdit.removeTextChangedListener(this);

            payCustomAmount.setEnabled(amountEdit.getText().length() != 0);

            try {

                if (string.contains(",")) {
                    try {
                        String afterDot = string.split(",")[1];
                        if (afterDot.length() > 2) {
                            string = string.substring(0,string.length() - 1);
                            Number n = df.parse(string);
                            amountEdit.setText(df.format(n).replace(","."));
                            amountEdit.setSelection(amountEdit.getText().length());
                            amountEdit.addTextChangedListener(this);
                            showOverPaidText();
                            return;
                        }
                    } catch (Exception e) {
                        if (BuildConfig.DEBUG) {
                            SysUtils.logf("PaymentOptions input: " + s + "Exception: " + e);
                        }
                    }
                } else {
                    if (string.length() > 11) {
                        string = string.substring(0,string.length() - 1);
                        Number n = dfnd.parse(string);
                        amountEdit.setText(dfnd.format(n));
                        amountEdit.setSelection(amountEdit.getText().length());
                        showOverPaidText();
                        amountEdit.addTextChangedListener(this);
                        return;
                    }
                }

                int inilen,endlen;
                inilen = amountEdit.getText().length();

                String v = string.replace(String.valueOf(df.getDecimalFormatSymbols().getGroupingSeparator()),"");

                int cp = amountEdit.getSelectionStart();
                if (hasDot) {
                    Number n = df.parse(v);
                    String ss = df.format(n).replace(",".");
                    amountEdit.setText(ss);
                } else {
                    Number n = dfnd.parse(v);
                    amountEdit.setText(dfnd.format(n));
                }
                endlen = amountEdit.getText().length();
                int sel = (cp + (endlen - inilen));
                if (sel > 0 && sel <= amountEdit.getText().length()) {
                    amountEdit.setSelection(sel);
                } else {
                    amountEdit.setSelection(amountEdit.getText().length() - 1);
                }
            } catch (NumberFormatException | ParseException e) {
                showOverPaidText();
                amountEdit.addTextChangedListener(this);

                if (BuildConfig.DEBUG) {
                    SysUtils.logf("PaymentOptions input: " + s + "Exception: " + e);
                }
                return;
            }
            showOverPaidText();
            amountEdit.addTextChangedListener(this);
            return;
        }
    });

My oncreate contains:

df = new DecimalFormat("#,###.00");
    df.setDecimalSeparatorAlwaysShown(true);
    dfnd = new DecimalFormat("#,###");

    hasDot = false;

Solution

Yes, it will - you use it exclusively## This means "include only numbers if they are important" If you want to always have at least one decimal place, use

DecimalFormat df = new DecimalFormat("#,###.0#");

If you always want two decimal places, use:

DecimalFormat df = new DecimalFormat("#,###.00");

You should probably consider how to format 0.5 Do you want "0.5" or ". 5"?