没有从Android 11获得音频，甚至下载和其他音乐文件

Question

在这里，我在Android 11中仅收到媒体警报铃声，但在Android 10及以下的其他设备中找到了所有音频 在图片中，您可以看到我在Android 11 中只能得到警报铃

Answer 1

我找到了解决这个问题的解决方案。在Android 11中，Android在Android中介绍了新表MediaStore.Downloads获取其他音频文件：

  @SuppressLint("Range")
    suspend fun getAllAudioFiles(): ArrayList<AudioModel> {
        val list = ArrayList<AudioModel>()
       val files = ArrayList<File>()
        list.clear()

        withContext(Dispatchers.IO) {
            try {
                val columns = arrayOf(
                    MediaStore.Audio.Media.DATA,
                    MediaStore.Audio.Media.TITLE,
                    MediaStore.Audio.Media.SIZE,
                    MediaStore.Audio.Media.DURATION,
                    MediaStore.Audio.Media._ID,
                )

                //Some audio may be explicitly marked as not being music

                //Some audio may be explicitly marked as not being music
                val selection = MediaStore.Audio.Media.IS_MUSIC + " == 0"


                //For Android 10 and Android 11
                val cursor = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                    MergeCursor(
                        arrayOf(
                            context.contentResolver.query(
                                MediaStore.Downloads.INTERNAL_CONTENT_URI,
                                columns, null,
                                null,
                                null
                            ),
                            context.contentResolver.query(
                                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                                columns, null,
                                null,
                                null
                            )
                        )
                    )
                } else {
                    //For Below Android 11
                    MergeCursor(
                        arrayOf(
                            context.contentResolver.query(
                                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                                columns, null,
                                null,
                                null
                            )
                        )
                    )
                }
                cursor?.moveToFirst()
//                files.clear()
                while (!cursor?.isAfterLast!!) {
                    val model = AudioModel()
                    val path =
                        cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA))
//                    files.add(File(path))
                    val id =
                        cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID))
                    val title =
                        cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE))
                    var duration =""
                   try {
                        duration =
                           cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION))
                               .toLong().convertLongToDurationTime()
                   }catch (e:Exception){
                       duration = "-1"
                   }
                    val size =
                        cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE))
                            .toLong().convertToLongTMbSize()
                    model.duration = duration
                    model.path = path
                    model.id = id
                    model.title = title
                    model.size = size
                    list.add(model)
                    cursor.moveToNext()
                }
                cursor.close()
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }    
        return list
    }

参考： https://developer.android.com/training/data-storage/shared/media