如何在Android App中使用AsYouTypeFormatter TextWatcher？

对于其他只想在用户键入时在EditText中格式化用户输入的电话号码的人来说，它比尝试任何这些冗长的答案都要容易得多（内置于Android中） - 而且这是一行代码！PhoneNumberFormattingTextWatcher

//Add a special listener for this instance that will format phone numbers on the fly.
this.editText.addTextChangedListener(new PhoneNumberFormattingTextWatcher());

您还可以传递用户选择的区域，我认为这实际上可以回答OP的问题，但直到API 21才可用：

//This version takes a country code!
this.editText.addTextChangedListener(new PhoneNumberFormattingTextWatcher("US"));

我最终在顶部声明了一个新的字符串：

private String unformattedPhoneNumber;

然后将我的代码更改为：

@Override
public void afterTextChanged(Editable s) {
    if (!isInAfterTextChanged) {
       isInAfterTextChanged = true;

       if(s.length() > 0){
           Log.v("AsYouTypeFormatter - source", s.toString());
           unformattedPhoneNumber = s.toString().replaceAll("[^\\d.]", "");
           for(int i = 0; i < unformattedPhoneNumber.length(); i++){
               formattedPhoneNumber = aytf.inputDigit(unformattedPhoneNumber.charAt(i));
               Log.v("AsYouTypeFormatter - formatted", formattedPhoneNumber);

           }
           Log.v("AsYouTypeFormatter - source after loop", s.toString());

           phoneNumberText.setText(formattedPhoneNumber);
           aytf.clear();
       }

       formattedPhoneNumber = null;
       isInAfterTextChanged = false;
   }
}

似乎aytf无法格式化已经部分格式化的电话号码，所以在重新提交给aytf之前，我不得不去除所有非数字？现在剩下的唯一问题是EditText字段中的光标位于开头而不是结尾，但这不应该是一个需要解决的问题。耶。

编辑代码：

@Override
public void afterTextChanged(Editable s) {
    if (!isInAfterTextChanged) {
        isInAfterTextChanged = true;
        phoneNumberText.setText(pnu.updateNationalNumber(s.toString()));
        phoneNumberText.setSelection(this.phoneNumberText.getText().length());
        isInAfterTextChanged = false;
    }
}

 /**
 * Updates the national number based on the param s
 * Takes all formatting out of param s and then reformats the number
 * using the AsYouTypeFormatter for libphonenumber and based upon
 * the region code
 *  
 * @param s The formatted value to be used to update the national number
 * @return String The new formatted national number
 */
public String updateNationalNumber(String s){
    //Instantiate the as you type formatter with the current region (US or UK)
    aytf = phoneUtil.getAsYouTypeFormatter(this.currentRegionCode.getCountryCode());
    String fNationalNumber = null;

    //Format the string
    if(s.length() > 0){
        String digitString = null;
        //If it's in the US remove all leading 1s (international code)
        if(this.currentRegionCode == RegionCode.US){
            digitString = new String(s.replaceAll("(^[1?])|([^\\d.])", ""));
        }
        //If it's in the UK remove all leading 44s (international code)
        else if (this.currentRegionCode == RegionCode.GB){
            digitString = new String(s.replaceAll("(^[4?]{2})|([^\\d.])", ""));
        }
       if(digitString != null){
           //RE input all of the digits into the formatter
           for(int i = 0; i < digitString.length(); i++){
               fNationalNumber = aytf.inputDigit(digitString.charAt(i));
           }
       }

       //Clear the formatter for the next round of input
       aytf.clear();

       //Try to update the phone number with the formatted number
       try {
           phoneUtil.parse(fNationalNumber, this.currentRegionCode.getCountryCode(), this.uPhoneNumber);
       //Rejects if the number isn't in an acceptable format for the region code given etc.
       } catch (NumberParseException e) {
          System.err.println("NumberParseException was thrown: " + e.toString());
       }
    }
    //Return the formatted phone number
    return fNationalNumber;
}