学步园

如果音乐文件带有内置图片的话，可以用如下的方式获取该图片。

public class ArtworkUtils {

    private static final Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
    private static final BitmapFactory.Options sBitmapOptions = new BitmapFactory.Options();

    public static Bitmap getArtwork(Context context, String title, long song_id, long album_id,
            boolean allowdefault) {
        if (album_id < 0) {
            if (song_id >= 0) {
                Bitmap bm = getArtworkFromFile(context, song_id, -1);
                if (bm != null) {
                    return bm;
                }
            }
            if (allowdefault) {
                return getDefaultArtwork(context);
            }
            return null;
        }
        ContentResolver res = context.getContentResolver();
        Uri uri = ContentUris.withAppendedId(sArtworkUri, album_id);
        if (uri != null) {
            InputStream in = null;
            try {
                in = res.openInputStream(uri);
                Bitmap bmp = BitmapFactory.decodeStream(in, null, sBitmapOptions);
                if (bmp == null) {
                    bmp = getDefaultArtwork(context);
                }
                return bmp;
            } catch (FileNotFoundException ex) {
                Bitmap bm = getArtworkFromFile(context, song_id, album_id);
                if (bm != null) {
                    if (bm.getConfig() == null) {
                        bm = bm.copy(Bitmap.Config.RGB_565, false);
                        if (bm == null && allowdefault) {
                            return getDefaultArtwork(context);
                        }
                    }
                } else if (allowdefault) {
                    bm = getDefaultArtwork(context);
                }
                return bm;
            } finally {
                try {
                    if (in != null) {
                        in.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

    private static Bitmap getArtworkFromFile(Context context, long songid, long albumid) {
        Bitmap bm = null;
        if (albumid < 0 && songid < 0) {
            throw new IllegalArgumentException("Must specify an album or a song id");
        }
        try {
            if (albumid < 0) {
                Uri uri = Uri.parse("content://media/external/audio/media/" + songid + "/albumart");
                ParcelFileDescriptor pfd = context.getContentResolver()
                        .openFileDescriptor(uri, "r");
                if (pfd != null) {
                    FileDescriptor fd = pfd.getFileDescriptor();
                    bm = BitmapFactory.decodeFileDescriptor(fd);
                }
            } else {
                Uri uri = ContentUris.withAppendedId(sArtworkUri, albumid);
                ParcelFileDescriptor pfd = context.getContentResolver()
                        .openFileDescriptor(uri, "r");
                if (pfd != null) {
                    FileDescriptor fd = pfd.getFileDescriptor();
                    bm = BitmapFactory.decodeFileDescriptor(fd);
                }
            }
        } catch (FileNotFoundException ex) {

        }
        return bm;
    }

    private static Bitmap getDefaultArtwork(Context context) {
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inPreferredConfig = Bitmap.Config.RGB_565;
        return BitmapFactory.decodeStream(
                context.getResources().openRawResource(R.drawable.music_icon), null,
                opts);
    }

代码经本人亲自验证并修改，并不是别的地方搜来搜去的仅仅那一篇，所以转载请注明出处。