Android保存小数点后n位

通过对EditTextView的输入变化进行监听,举例，保存小数点后两位

int n=2;
etMoney.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence s, int i, int i1, int i2) {
                if (s.toString().contains(".")) {
                    if (s.length() - 1 - s.toString().indexOf(".") > n) {
                        s = s.toString().subSequence(0,
                                s.toString().indexOf(".") + (n+1));
                        etMoney.setText(s);
                        etMoney.setSelection(s.length());
                    }
                }
                if (s.toString().trim().substring(0).equals(".")) {
                    s = "0" + s;
                    etMoney.setText(s);
                    etMoney.setSelection(2);
                }

                if (s.toString().startsWith("0")
                        && s.toString().trim().length() > 1) {
                    if (!s.toString().substring(1, 2).equals(".")) {
                        etMoney.setText(s.subSequence(0, 1));
                        etMoney.setSelection(1);
                        return;
                    }
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });