我正在为加州的android开发一个应用程序。现在我想以xxx-xx-xxxx格式输入编辑文本中的社会安全号码。我已经尝试使用以下代码来实现功能，但它不能正常清除文本..以下是我的代码。任何帮助，将不胜感激。我想要自动格式化功能。
etSocialSecurityNumber.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
String text = etSocialSecurityNumber.getText().toString();
textlength = etSocialSecurityNumber.getText().length();
if(text.endsWith(" "))
return;
if(textlength == 4 || textlength == 7 )
{
etSocialSecurityNumber.setText(new StringBuilder(text).insert(text.length()-1, "-").toString());
etSocialSecurityNumber.setSelection(etSocialSecurityNumber.getText().length());
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
答案 0 :(得分：6)
这将在每4个字符之后添加一个 - 并且它对用户进行所有类型的编辑，只需将条件设置为3和2个字符：
edit_text.addTextChangedListener(new TextWatcher() {
private boolean spaceDeleted;
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
CharSequence charDeleted = s.subSequence(start, start + count);
spaceDeleted = " ".equals(charDeleted.toString());
}
public void afterTextChanged(Editable editable) {
edit_text.removeTextChangedListener(this);
int cursorPosition = edit_text.getSelectionStart();
String withSpaces = formatText(editable);
edit_text.setText(withSpaces);
edit_text.setSelection(cursorPosition + (withSpaces.length() - editable.length()));
if (spaceDeleted) {
edit_text.setSelection(edit_text.getSelectionStart() - 1);
spaceDeleted = false;
}
edit_text.addTextChangedListener(this);
}
private String formatText(CharSequence text)
{
StringBuilder formatted = new StringBuilder();
int count = 0;
for (int i = 0; i < text.length(); ++i)
{
if (Character.isDigit(text.charAt(i)))
{
if (count % 4 == 0 && count > 0)
formatted.append("-");
formatted.append(text.charAt(i));
++count;
}
}
return formatted.toString();
}
});
编辑：
userNameET.addTextChangedListener(new TextWatcher() {
private boolean spaceDeleted;
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
CharSequence charDeleted = s.subSequence(start, start + count);
spaceDeleted = "-".equals(charDeleted.toString());
}
public void afterTextChanged(Editable editable) {
userNameET.removeTextChangedListener(this);
int cursorPosition = userNameET.getSelectionStart();
String withSpaces = formatText(editable);
userNameET.setText(withSpaces);
userNameET.setSelection(cursorPosition + (withSpaces.length() - editable.length()));
if (spaceDeleted) {
// userNameET.setSelection(userNameET.getSelectionStart() - 1);
spaceDeleted = false;
}
userNameET.addTextChangedListener(this);
}
private String formatText(CharSequence text)
{
StringBuilder formatted = new StringBuilder();
int count = 0;
if(text.length()==3||text.length()==6)
{
if (!spaceDeleted)
formatted.append(text+"-");
else
formatted.append(text);
}
else
formatted.append(text);
return formatted.toString();
}
});
答案 1 :(得分：1)
我知道在这里发布答案为时已晚。我只是想分享我用来格式化SSN的代码。请尝试以下代码。
public class SSNFormatter implements TextWatcher{
private boolean mFormatting;
private boolean clearFlag;
private int mLastStart;
private String mBeforeText;
private boolean spaceDeleted;
WeakReference<EditText> mWeakEditText;
public SSNFormatter(WeakReference<EditText> weakEditText) {
this.mWeakEditText = weakEditText;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
mLastStart = start;
mBeforeText = s.toString();
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.length()>0 && mWeakEditText.get().getText().hashCode() == s.hashCode() && mWeakEditText.get().getError() != null)
mWeakEditText.get().setError(null);
if (!mFormatting) {
mFormatting = true;
int curPos = mLastStart;
String beforeValue = mBeforeText;
String currentValue = s.toString();
String formattedValue = formatSSN(s);
if (currentValue.length() > beforeValue.length()) {
int setCusorPos = formattedValue.length()
- (beforeValue.length() - curPos);
mWeakEditText.get().setSelection(
setCusorPos < 0 ? 0 : setCusorPos);
} else {
int setCusorPos = formattedValue.length()
- (currentValue.length() - curPos);
if (setCusorPos > 0
&& !Character.isDigit(formattedValue
.charAt(setCusorPos - 1))) {
setCusorPos--;
}
mWeakEditText.get().setSelection(
setCusorPos < 0 ? 0 : setCusorPos);
}
mFormatting = false;
}
}
private String formatSSN(Editable text){
StringBuilder formattedString = new StringBuilder();
// Remove everything except digits
int p = 0;
while (p < text.length()) {
char ch = text.charAt(p);
if (!Character.isDigit(ch)) {
text.delete(p, p + 1);
} else {
p++;
}
}
// Now only digits are remaining
String allDigitString = text.toString();
int totalDigitCount = allDigitString.length();
if (totalDigitCount == 0 || totalDigitCount > 10) {
// May be the total length of input length is greater than the
// expected value so we'll remove all formatting
text.clear();
text.append(allDigitString);
return allDigitString;
}
int alreadyPlacedDigitCount = 0;
// Only '1' is remaining and user pressed backspace and so we clear
// the edit text.
if (allDigitString.equals("1") && clearFlag) {
text.clear();
clearFlag = false;
return "";
}
boolean chang3 = true;
boolean chang2 = false;
// There must be a '-' inserted after the next 3 numbers
if (chang3 && totalDigitCount - alreadyPlacedDigitCount > 3) {
formattedString
.append(allDigitString.substring(alreadyPlacedDigitCount,
alreadyPlacedDigitCount + 3) + "-");
alreadyPlacedDigitCount += 3;
chang3 = false;
chang2 = true;
}
// There must be a '-' inserted after the next 2 numbers
if (chang2 && totalDigitCount - alreadyPlacedDigitCount > 2) {
formattedString
.append(allDigitString.substring(alreadyPlacedDigitCount,
alreadyPlacedDigitCount + 2) + "-");
alreadyPlacedDigitCount += 2;
chang3 = true;
chang2 = false;
}
// All the required formatting is done so we'll just copy the
// remaining digits.
if (totalDigitCount > alreadyPlacedDigitCount) {
formattedString.append(allDigitString
.substring(alreadyPlacedDigitCount));
}
text.clear();
text.append(formattedString.toString());
return formattedString.toString();
}
}
答案 2 :(得分：1)
以下Kotlin代码足以满足我的要求
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
backspaced = count == 0
}
override fun afterTextChanged(s: Editable?) {
s?.apply {
if (!isEmpty()) {
if (get(lastIndex) != '-' && (length > 1 && get(lastIndex - 1) != '-') && !backspaced)
count { x -> x.isDigit() }.let { mapOf(3 to 3, 4 to 3, 5 to 6, 6 to 6)[it]?.let { index -> insert(index, "-") } }
else if ((get(lastIndex) == '-' && backspaced) || (lastIndexOf('-') in listOf(0,1,2,4,5,7,8,9,10)) )
delete(length - 1, length)
}
}
}