你好，请问怎么设置读取的歌词文件的编码格式？ about lrcview HOT 1 CLOSED

fun convertFileCode(file: File): String {
    var text = ""
    var fis: FileInputStream? = null
    var bis: BufferedInputStream? = null
    var reader: BufferedReader? = null
    try {
        fis = FileInputStream(file)
        bis = BufferedInputStream(fis)
        bis.mark(4)
        val first3bytes = ByteArray(3)
        bis.read(first3bytes)
        bis.reset()
        if (first3bytes[0] == 0xEF.toByte() && first3bytes[1] == 0xBB.toByte() && first3bytes[2] == 0xBF.toByte()) {// utf-8
            reader = BufferedReader(InputStreamReader(bis, "utf-8"))
        } else if (first3bytes[0] == 0xFF.toByte() && first3bytes[1] == 0xFE.toByte()) {
            reader = BufferedReader(InputStreamReader(bis, "unicode"))
        } else if (first3bytes[0] == 0xFE.toByte() && first3bytes[1] == 0xFF.toByte()) {
            reader = BufferedReader(InputStreamReader(bis, "utf-16be"))
        } else if (first3bytes[0] == 0xFF.toByte() && first3bytes[1] == 0xFF.toByte()) {
            reader = BufferedReader(InputStreamReader(bis, "utf-16le"))
        } else {
            reader = BufferedReader(InputStreamReader(bis, "GBK"))
        }
        var str = reader.readLine();

        while (str != null) {
             text = "$text$str/n"
             str = reader.readLine()

        }
    } catch (e: Exception){e.printStackTrace()
    } finally {
        fis?.let {
            try{
                it.close()
            }catch (e: IOException){e.printStackTrace() }
        }
        bis?.let {
            try{
                it.close()
            }catch (e: IOException){e.printStackTrace() }
        }
    }
    return text
}