android的edittext输入银行卡默认4位一个空格

package com.example.testdemo;


import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.widget.EditText;


public class CardEditText extends EditText {
public CardEditText(Context context) {
super(context);
// TODO Auto-generated constructor stub
}


public CardEditText(Context context, AttributeSet attrs) {
super(context, attrs);
setBankCardTypeOn();
}


public CardEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// TODO Auto-generated constructor stub
}


private boolean isRun = false;
private String d = "";


private int getEditTextCursorIndex(EditText editText) {


int i = editText.getText().toString().length();
return i;


}


public void setBankCardTypeOn() {
CardEditText.this.addTextChangedListener(new TextWatcher() {


@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
if (isRun) {
isRun = false;
return;
}
isRun = true;
d = "";
String newStr = s.toString();
newStr = newStr.replace(" ", "");


int index = 0;
while ((index + 4) < newStr.length()) {
d += (newStr.substring(index, index + 4) + " ");
index += 4;
}
d += (newStr.substring(index, newStr.length()));
int i = getEditTextCursorIndex(CardEditText.this);


CardEditText.this.setText(d);
try {


if (i % 5 == 0 && before == 0) {
if (i + 1 <= d.length()) {// 判断位数再设置，否则在第四位的时候按空格程序会崩掉
CardEditText.this.setSelection(i + 1);
} else {
CardEditText.this.setSelection(d.length());
}
} else if (before == 1 && i < d.length()) {
CardEditText.this.setSelection(i);
} else if (before == 0 && i < d.length()) {
CardEditText.this.setSelection(i);
} else
CardEditText.this.setSelection(d.length());
} catch (Exception e) {
// VposUtility.showException(e);
}


}


private void insertText(EditText editText, String mText) {
editText.getText().insert(getEditTextCursorIndex(editText),
mText);
}


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


}


@Override
public void afterTextChanged(Editable s) {


}
});
}
}