播放所需文件夹中的音频文件

Question

我有5个文件夹，每个文件夹包含5个音频文件。当有人点击文件夹时，程序应该开始播放该文件夹中的所有音频文件。我是 android 的新手，所以我对此知之甚少。我尝试这样做，但它会同时显示所有音频文件。我希望它能明智地显示文件夹。

fun abs(){

    var songsURI = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
    var selection = MediaStore.Audio.Media.IS_MUSIC + "!=0"
    val cursor = contentResolver.query(songsURI,null,selection,null,null)
    if(cursor!= null)
    {
        if (cursor!!.moveToFirst()){

            do
            {
                var songURL = cursor!!.getString(cursor!!.getColumnIndex(MediaStore.Audio.Media.DATA))
                        var songAuth =cursor!!.getString(cursor!!.getColumnIndex(MediaStore.Audio.Media.ARTIST))
                                var SongNAme = cursor!!.getString(cursor!!.getColumnIndex(MediaStore.Audio.Media.TITLE))
                listSongs.add(Songinfo(songURL,songAuth,SongNAme))

            }while (cursor!!.moveToNext())
        }
        cursor!!.close()

        adapter = MySongAdapter(listSongs)
        hello.adapter = adapter
    }


}

请帮忙

Answer 1

下面的代码将为您提供每个目录中的歌曲列表，您应该更改适配器以显示目录名称和歌曲列表。

data class SongInfo(var songURL: String, var songAuth: String, var songNAme: String)
data class DirInfo(var dir: String, var songInfo: ArrayList<SongInfo>)

private fun getAudioDirectories(): ArrayList<DirInfo> {

    var result = ArrayList<DirInfo>()

    val directories = LinkedHashMap<String, ArrayList<SongInfo>>()

    val uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
    val selection = MediaStore.Audio.Media.IS_MUSIC + "!=0"

    val order = MediaStore.Audio.Media.DATE_MODIFIED + " DESC"

    val cursor = getContentResolver().query(uri, null, selection, null, order)

    cursor.let {
        it.moveToFirst()

        val pathIndex = it.getColumnIndex(MediaStore.Images.Media.DATA)

        do {
            val path = it.getString(pathIndex)

            val file = File(path)
            if (!file.exists()) {
                continue
            }

            val fileDir = file.getParent()

            var songURL = it.getString(it.getColumnIndex(MediaStore.Audio.Media.DATA))
            var songAuth = it.getString(it.getColumnIndex(MediaStore.Audio.Media.ARTIST))
            var songName = it.getString(it.getColumnIndex(MediaStore.Audio.Media.TITLE))

            if (directories.containsKey(fileDir)) {
                var songs = directories.getValue(fileDir);

                var song = SongInfo(songURL, songAuth, songName)

                songs.add(song)

                directories.put(fileDir, songs)
            } else {
                var song = SongInfo(songURL, songAuth, songName)

                var songs = ArrayList<SongInfo>()
                songs.add(song)

                directories.put(fileDir, songs)
            }
        } while (it.moveToNext())


        for (dir in directories) {
            var dirInfo: DirInfo = DirInfo(dir.key, dir.value);

            result.add(dirInfo)
        }
    }

    return result
}

使用您的适配器我们无法显示带有歌曲列表的专辑列表，您可以使用 this or you can take any of these libs from Android-Arsenal

播放所需文件夹中的音频文件

Playing audio files from desired folder

android

audio

directory

media-player

kotlin