銀行卡號 自動加空格處理， 6222 1234 1234 1234 格式。

/**
 * 銀行卡號 自動加空格處理， 6222 1234 1234 1234 格式。
 *  
 */
public static void spaceDivide(final EditText mEditText) {    //測試，20位內有效
    mEditText.addTextChangedListener(new TextWatcher() {
        int beforeTextLength = 0;
        int onTextLength = 0;
        boolean isChanged = false;


        int location = 0;// 記錄光標的位置
        private char[] tempChar;
        private StringBuffer buffer = new StringBuffer();
        int konggeNumberB = 0;


        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            beforeTextLength = s.length();
            if (buffer.length() > 0) {
                buffer.delete(0, buffer.length());
            }
            konggeNumberB = 0;
            for (int i = 0; i < s.length(); i++) {
                if (s.charAt(i) == ' ') {
                    konggeNumberB++;
                }
            }
        }


        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            onTextLength = s.length();
            buffer.append(s.toString());
            if (onTextLength == beforeTextLength || onTextLength <= 3 || isChanged) {
                isChanged = false;
                return;
            }
            isChanged = true;
        }


        @Override
        public void afterTextChanged(Editable s) {
            if (isChanged) {
                location = mEditText.getSelectionEnd();
                int index = 0;
                while (index < buffer.length()) {
                    if (buffer.charAt(index) == ' ') {
                        buffer.deleteCharAt(index);
                    } else {
                        index++;
                    }
                }


                index = 0;
                int konggeNumberC = 0;
                while (index < buffer.length()) {
                    if ((index == 4 || index == 9 || index == 14 || index == 19 || index == 24 || index == 29)) {
                        buffer.insert(index, ' ');
                        konggeNumberC++;
                    }
                    index++;
                }


                if (konggeNumberC > konggeNumberB) {
                    location += (konggeNumberC - konggeNumberB);
                }


                tempChar = new char[buffer.length()];
                buffer.getChars(0, buffer.length(), tempChar, 0);
                String str = buffer.toString();
                if (location > str.length()) {
                    location = str.length();
                } else if (location < 0) {
                    location = 0;
                }


                mEditText.setText(str);
                Editable etable = mEditText.getText();
                Selection.setSelection(etable, location);
                isChanged = false;
            }
        }
    });
}