EditText数字分组仅显示4个字符

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="number"
    android:digits="0123456789 "
    android:maxLength="19" />

EditText editText = findViewById(R.id.editText);
editText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

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

    @Override
    public void afterTextChanged(Editable s) {
        String text = s.toString().replaceAll(" ", ""); // 去除空格
        StringBuilder formattedText = new StringBuilder();
        for (int i = 0; i < text.length(); i++) {
            formattedText.append(text.charAt(i));
            if ((i + 1) % 4 == 0 && i != text.length() - 1) {
                formattedText.append(" "); // 每4个字符添加一个空格
            }
        }
        editText.removeTextChangedListener(this); // 避免死循环
        editText.setText(formattedText.toString());
        editText.setSelection(formattedText.length());
        editText.addTextChangedListener(this);
    }
});