原文来自：《【Android】银行卡自动格式化及归属银行》 https://www.jianshu.com/p/a855e3af6ce4
原文主要代码
public class BandCardEditText extends EditText {
private boolean shouldStopChange = false;
private final String space = " ";
private BankCardListener listener;
public BandCardEditText(Context context) {
this(context, null);
}
public BandCardEditText(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public BandCardEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
format(getText());
shouldStopChange = false;
setFocusable(true);
setEnabled(true);
setFocusableInTouchMode(true);
addTextChangedListener(new BandCardWatcher());
}
class BandCardWatcher implements TextWatcher {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable editable) {
format(editable);
}
}
private void format(Editable editable) {
if (shouldStopChange) {
shouldStopChange = false;
return;
}
shouldStopChange = true;
String str = editable.toString().trim().replaceAll(space, "");
int len = str.length();
int courPos;
StringBuilder builder = new StringBuilder();
for (int i = 0; i < len; i++) {
builder.append(str.charAt(i));
if (i == 3 || i == 7 || i == 11 || i == 15) {
if (i != len - 1)
builder.append(space);
}
}
courPos = builder.length();
setText(builder.toString());
setSelection(courPos);
if (listener != null) {
if (isBankCard()) {
char[] ss = getBankCardText().toCharArray();
listener.success(BankInfo.getNameOfBank(ss, 0));
} else {
listener.failure();
}
}
}
public String getBankCardText() {
return getText().toString().trim().replaceAll(" ", "");
}
public boolean isBankCard() {
return checkBankCard(getBankCardText());
}
/**
* 校验银行卡卡号
* @param cardId
* @return
*/
public boolean checkBankCard(String cardId) {
if(TextUtils.isEmpty(cardId)) {
return false;
}
char bit = getBankCardCheckCode(cardId.substring(0, cardId.length() - 1));
if (bit == 'N') {
return false;
}
return cardId.charAt(cardId.length() - 1) == bit;
}
/**
*
* @param nonCheckCodeCardId
* @return
*/
public char getBankCardCheckCode(String nonCheckCodeCardId) {
if (TextUtils.isEmpty(nonCheckCodeCardId)
|| !nonCheckCodeCardId.matches("\\d+")
|| nonCheckCodeCardId.length() < 16
|| nonCheckCodeCardId.length() > 19) {
//如果传的不是数据返回N
return 'N';
}
char[] chs = nonCheckCodeCardId.trim().toCharArray();
int sum = 0;
for (int i = chs.length - 1, j = 0; i >= 0; i--, j++) {
int k = chs[i] - '0';
if (j % 2 == 0) {
k *= 2;
k = k / 10 + k % 10;
}
sum += k;
}
return (sum % 10 == 0) ? '0' : (char) ((10 - sum % 10) + '0');
}
public void setBankCardListener(BankCardListener listener) {
this.listener = listener;
}
public interface BankCardListener {
void success(String name);
void failure();
}
}
问题
但该代码存在bug，光标选择永远处于输入框尾部，导致无法插入、区间删除等操作，修改版本如下：
解决
public class CardNumberEditText extends android.support.v7.widget.AppCompatEditText {
private boolean shouldStopChange = false;
private final String space = " ";
private BankCardListener listener;
public CardNumberEditText(Context context) {
this(context, null);
}
public CardNumberEditText(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CardNumberEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
format(getText().toString());
shouldStopChange = false;
setFocusable(true);
setEnabled(true);
setFocusableInTouchMode(true);
addTextChangedListener(new BandCardWatcher());
}
class BandCardWatcher implements TextWatcher {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable editable) {
format(editable.toString());
}
}
private void format(String text) {
int selection = getSelectionEnd();
Log.i(">>>", "endSelection: " + selection);
if (shouldStopChange) {
shouldStopChange = false;
return;
}
shouldStopChange = true;
String str = text.trim().replaceAll(space, "");
int len = str.length();
int courPos;
StringBuilder builder = new StringBuilder();
for (int i = 0; i < len; i++) {
builder.append(str.charAt(i));
if (i == 3 || i == 7 || i == 11 || i == 15 || i == 19) {
if (i != len - 1) {
builder.append(space);
}
}
}
if (builder.toString().length()>2)selection = selection + (builder.toString().substring(0,builder.toString().length()-1).endsWith(space) ? 1 : 0);
if (selection>builder.toString().length())selection=builder.toString().length();
setText(builder.toString());
Log.i(">>>", "countStr: " + countStr(builder.toString(), space));
Log.i(">>>", "selection: " + selection);
try {
setSelection(selection);
} catch (Exception e) {
}
if (listener != null) {
if (isBankCard()) {
char[] ss = getBankCardText().toCharArray();
listener.success(BankInfo.getNameOfBank(ss, 0));
} else {
listener.failure();
}
}
}
private int countStr(String str, String sToFind) {
int num = 0;
while (str.contains(sToFind)) {
str = str.substring(str.indexOf(sToFind) + sToFind.length());
num++;
}
return num;
}
public String getBankCardText() {
return getText().toString().trim().replaceAll(" ", "");
}
public boolean isBankCard() {
return checkBankCard(getBankCardText());
}
/**
* 校验银行卡卡号
*
* @param cardId
* @return
*/
public boolean checkBankCard(String cardId) {
if (TextUtils.isEmpty(cardId)) {
return false;
}
char bit = getBankCardCheckCode(cardId.substring(0, cardId.length() - 1));
if (bit == 'N') {
return false;
}
return cardId.charAt(cardId.length() - 1) == bit;
}
/**
* @param nonCheckCodeCardId
* @return
*/
public char getBankCardCheckCode(String nonCheckCodeCardId) {
if (TextUtils.isEmpty(nonCheckCodeCardId)
|| !nonCheckCodeCardId.matches("\\d+")
|| nonCheckCodeCardId.length() < 16
|| nonCheckCodeCardId.length() > 19) {
//如果传的不是数据返回N
return 'N';
}
char[] chs = nonCheckCodeCardId.trim().toCharArray();
int sum = 0;
for (int i = chs.length - 1, j = 0; i >= 0; i--, j++) {
int k = chs[i] - '0';
if (j % 2 == 0) {
k *= 2;
k = k / 10 + k % 10;
}
sum += k;
}
return (sum % 10 == 0) ? '0' : (char) ((10 - sum % 10) + '0');
}
public void setBankCardListener(BankCardListener listener) {
this.listener = listener;
}
public interface BankCardListener {
void success(String name);
void failure();
}
}
