银行卡输入特效 4个加一空格

private static final char kongge = ‘ ‘;private TextWatcher textWatcher=new TextWatcher() {

    //改变之前text长度 int beforeTextLength = 0; //改变之前的文字 private CharSequence beforeChar; //改变之后text长度 int onTextLength = 0; //是否改变空格或光标 boolean isChanged = false; // 记录光标的位置 int location = 0;    private char[] tempChar;    private StringBuffer buffer = new StringBuffer(); //已有空格数量 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 = yourCardNumEd.getSelectionEnd();            int index = 0;            while (index < buffer.length()) {                if (buffer.charAt(index) == kongge) {                    buffer.deleteCharAt(index); } else {                    index++; }            }            index = 0;            int konggeNumberC = 0;            while (index < buffer.length()) {                if ((index == 4 || index == 9 || index == 14 || index == 19)) {                    buffer.insert(index, kongge); 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; }

            yourCardNumEd.setText(str); Editable etable = yourCardNumEd.getText();            if (location>20){                ToastUtil.ToastShow("最多才能输入20位");                return; }

            Selection.setSelection(etable, location);

 isChanged = false; }    }

};