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) {

}

});

}

}