android - EditText - 如何将在 EditText 中键入的字符分隔成组或 block

Question

有没有一种方法可以在用户键入时将 EditText 中的字符分组？例如:1234 4567 7890 等等？

我有一个支持数字的编辑文本，长度为 16 个字符，我想将它们分组到单独的 block 中以获得更好的可见性。

Answer 1

    editText.addTextChangedListener(new FourDigitCardFormatWatcher(editText));

每4位加一个空格。使用下面的代码。

public class FourDigitCardFormatWatcher implements TextWatcher {

    // Change this to what you want... ' ', '-' etc..
        private final String space = " ";
        EditText et_filed;


        public FourDigitCardFormatWatcher(EditText et_filed){
            this.et_filed = et_filed;
        }

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

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
            String initial = s.toString();
            // remove all non-digits characters
            String processed = initial.replaceAll("\\D", "");

            if (processed.length() > 4){
                processed = processed.replaceAll("(\\d{4})(?=\\d)", "$1 ");
            }

            //Remove the listener
            et_filed.removeTextChangedListener(this);

            //Assign processed text
            et_filed.setText(processed);

            try {
                et_filed.setSelection(processed.length());
        } catch (Exception e) {
            // TODO: handle exception
        }

        //Give back the listener
            et_filed.addTextChangedListener(this);
        }
    }