我无法推到音频列表。重要提示：我不想将listOf更改为mutableListOf

private var offlineAudioList: List<Audio> = listOf(Audio())
val audio = Audio(
                    _id = cursor.getString(
                        cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID)
                    ), filePath = cursor.getString(
                        cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.RELATIVE_PATH)
                    ), title = cursor.getString(
                        cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)
                    ), duration = cursor.getInt(
                        cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)
                    ), writer = User(
                        image = cursor.getString(
                            cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST_ID)
                        )
                    )
                )
offlineAudioList.plus(audio)

虽然音频不是空的，但这不起作用。当我记录音频时，它给了我一个有数据的类，所以这不是问题所在。