android - android中的电话号码自动格式化

Question

我需要按照这种格式在 android 的编辑文本中格式化电话号码 (222) 222-2222 ext222222我创建了一个为我自动格式化的观察者。观察者工作正常并正确格式化电话号码。我唯一的问题是，当有人手动转到输入电话中的其他位置并开始删除或添加号码时，自动格式化不起作用。关于如何解决这个问题的任何想法。这是我当前的观察者的样子:

editText.addTextChangedListener(object : TextWatcher {
    override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {}

    override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}

    override fun afterTextChanged(s: Editable) {
        val text = editText.text.toString()
        val textLength = editText.text.length
        if (text.endsWith("-") || text.endsWith(" ")) {
            return
        }
        if (textLength == 1) {
            if (!text.contains("(")) {
                editText.setText(StringBuilder(text).insert(text.length - 1, "(").toString())
                editText.setSelection(editText.text.length)
            }
        } else if (textLength == 5) {
            if (!text.contains(")")) {
                editText.setText(StringBuilder(text).insert(text.length - 1, ")").toString())
                editText.setSelection(editText.text.length)
            }
        } else if (textLength == 6) {
            editText.setText(StringBuilder(text).insert(text.length - 1, " ").toString())
            editText.setSelection(editText.text.length)
        } else if (textLength == 10) {
            if (!text.contains("-")) {
                editText.setText(StringBuilder(text).insert(text.length - 1, "-").toString())
                editText.setSelection(editText.text.length)
            }
        } else if (textLength == 15) {
            if (text.contains("-")) {
                editText.setText(StringBuilder(text).insert(text.length - 1, " ext").toString())
                editText.setSelection(editText.text.length)
            }
        }
    }
})

Answer 1

如果一切都取决于我，这就是我可以处理的方式(见行间评论)。这仅适用于电话号码格式，假设它是一个最多 10 位数字的地区号码:

phoneNumber.addTextChangedListener(new 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 s) {

                /* Let me prepare a StringBuilder to hold all digits of the edit text */
                    StringBuilder digits = new StringBuilder();

                 /* this is the phone StringBuilder that will hold the phone number */

                    StringBuilder phone = new StringBuilder();

                 /* let's take all characters from the edit text */
                    char[] chars = phoneNumber.getText().toString().toCharArray();

                   /* a loop to extract all digits */
                    for (int x = 0; x < chars.length; x++) {
                        if (Character.isDigit(chars[x])) {
                            /* if its a digit append to digits string builder */
                            digits.append(chars[x]);
                        }
                    }


                    if (digits.toString().length() >=3) {
                        /* our phone formatting starts at the third character  and starts with the country code*/
                        String countryCode = new String();

                        /* we build the country code */
                        countryCode += "(" + digits.toString().substring(0, 3) + ") ";

                        /** and we append it to phone string builder **/
                        phone.append(countryCode);

                        /** if digits are more than or just 6, that means we already have our state code/region code **/
                        if (digits.toString().length()>=6)
                        {

                            String regionCode=new String();
                            /** we build the state/region code **/
                            regionCode+=digits.toString().substring(3,6)+"-";
                            /** we append the region code to phone **/
                            phone.append(regionCode);



                            /** the phone number will not go over 12 digits  if ten, set the limit to ten digits**/
                            if (digits.toString().length()>=10)
                            {
                                phone.append(digits.toString().substring(6,10));
                            }else
                            {
                                phone.append(digits.toString().substring(6));
                            }
                        }else
                        {
                            phone.append(digits.toString().substring(3));
                        }
                        /** remove the watcher  so you can not capture the affectation you are going to make, to avoid infinite loop on text change **/
                        phoneNumber.removeTextChangedListener(this);

                        /** set the new text to the EditText **/
                        phoneNumber.setText(phone.toString());
                        /** bring the cursor to the end of input **/
                        phoneNumber.setSelection(phoneNumber.getText().toString().length());
                        /* bring back the watcher and go on listening to change events */
                        phoneNumber.addTextChangedListener(this);

                    } else {
                        return;
                    }

            }
        });

每次用户更改 EditText 的值时，此代码都会重新格式化电话号码。我已经亲自测试过它并且它可以工作并且不会崩溃。你可以测试。

编辑:这是一段 java 代码，但我认为您可以轻松地将其重写为 Kotlin。