使用专辑封面填充歌曲列表 - 无法获取专辑封面

Question

我目前正在设备上构建音乐浏览器/音乐播放器。我成功地用歌曲的名称及其艺术家填充了列表视图，但我无法显示与歌曲相关的专辑封面。我不太确定获得专辑封面的正确途径是什么，以及如何将其与歌曲相关联。显示代码生成，但不显示专辑封面。我猜专辑ArtUri不好。你能帮我找到正确的专辑封面乌里吗？

感谢您的帮助，非常感谢:)

朱利安

这是我的歌曲适配器代码：

using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Util;
using Android.Views;
using Android.Widget;
using Android.Provider;
using Android.Database;
using Android.Net;
namespace project
{
    public class SongsAdapter:CursorAdapter 
    {
        List<Song> songsList;
        Activity context;
        public SongsAdapter (Activity context, ICursor cursor, List<Song> theSongs): base(context,cursor)
        {
            this.context = context;
            songsList = theSongs;
        }
    public override void BindView(View view, Context context, ICursor cursor)
    {
        var song_title = view.FindViewById<TextView> (Resource.Id.song_title);
        var song_artist = view.FindViewById<TextView> (Resource.Id.song_artist);
        var song_album_art = view.FindViewById<ImageView> (Resource.Id.song_album_art);
        song_title.Text = songsList [cursor.Position].Title;
        song_artist.Text = songsList [cursor.Position].Artist;

        //If there is an image to display, it will display it. If not, it will use a default image
        if (songsList [cursor.Position].AlbumId == null) {
            song_album_art = view.FindViewById<ImageView> (Resource.Id.song_album_art);
            song_album_art.SetImageResource (Resource.Drawable.ic_action_user); //Image needs to be set
        } else {
            var songUri = ContentUris.WithAppendedId (MediaStore.Audio.Media.ExternalContentUri, songsList [cursor.Position].Id);
            var albumArtUri = Android.Net.Uri.WithAppendedPath(songUri,MediaStore.Audio.Albums.EntryContentType);
            song_album_art.SetImageURI (albumArtUri);
        }
    }
    public override View NewView(Context context, ICursor cursor, ViewGroup parent)
    {
        return this.context.LayoutInflater.Inflate(Resource.Layout.songslistitem, parent, false);
    }
}
}

以下是我如何称呼SongAdapter：

                ListView listView;
                view = LayoutInflater.From (container.Context).Inflate (Resource.Layout.songlist, container, false);
                listView = view.FindViewById<ListView> (Resource.Id.List);
                List<Song> songsList;
                var uri = MediaStore.Audio.Media.ExternalContentUri;
                string[] projection = {
                    MediaStore.Audio.Media.InterfaceConsts.Id,
                    MediaStore.Audio.Media.InterfaceConsts.AlbumId,
                    MediaStore.Audio.Media.InterfaceConsts.Title,
                    MediaStore.Audio.Media.InterfaceConsts.Artist,
                };
                var loader = new CursorLoader (container.Context, uri, projection, null, null, null);
                var cursor = (ICursor)loader.LoadInBackground ();
                songsList = new List<Song> ();
                if (cursor.MoveToFirst ()) {
                    do {
                        songsList.Add (new Song {
                            Id = cursor.GetLong (cursor.GetColumnIndex (projection [0])),
                            AlbumId = cursor.GetString (cursor.GetColumnIndex (projection [1])),
                            Title = cursor.GetString (cursor.GetColumnIndex (projection [2])),
                            Artist = cursor.GetString (cursor.GetColumnIndex (projection [3]))
                        });
                    } while (cursor.MoveToNext ());
                }
                listView.Adapter = new SongsAdapter (context,cursor,songsList);

Answer 1

我能够通过在歌曲适配器中执行此操作来解决我的问题：

        long album_id = cursor.GetLong(cursor.GetColumnIndex(MediaStore.Audio.Albums.InterfaceConsts.AlbumId));
        var songCover = Android.Net.Uri.Parse ("content://media/external/audio/albumart");
        var songAlbumArtUri = ContentUris.WithAppendedId (songCover, album_id);
        song_artist.Text = songAlbumArtUri.ToString();
        song_album_art.SetImageURI (songAlbumArtUri);

多亏了这个堆栈溢出答案，我找到了答案：从音频文件 Uri 获取专辑封面