最近有一個EditText內只能輸入數字，字母，漢字的字元型別限制，隨手整理一下，有新的內容以後在做修改

  fun stringFilter(str: String): String {
        val regEx = "[^a-zA-Z0-9\u4E00-\u9FA5]"
        val pattern = Pattern.compile(regEx)
        val matcher = pattern.matcher(str)
        return matcher.replaceAll("").trim()
    }

  device_name.addTextChangedListener(object : TextWatcher {
                                override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {}
                                override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
                                    name = stringFilter(s.toString())
                                    if (s.toString() != name) {
                                        device_name.setText(name)
                                        device_name.setSelection(name.length)
                                    }
                                }
                                override fun afterTextChanged(s: Editable) {}
                            })
 

禁止輸入表情

val emoji = Pattern.compile("[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]",
                Pattern.UNICODE_CASE | Pattern.CASE_INSENSITIVE);