android 音乐播放器----获取专辑封面图片

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http://blog.csdn.net/dany1202/archive/2011/06/08/6532024.aspx

.mp3歌曲中，附带有专辑封面的图片，如何解析获取并显示这张图片呢？如图：

该图片为使用如下代码解析得到：

参考源码中，音乐目录：

packages/apps/Music/src/com/android/music/MusicUtils.java中函数：getArtwork(context, song_id, album_id, true)

public static Bitmap getArtwork(Context context, long song_id, long album_id, boolean allowdefault) { if (album_id < 0) { // This is something that is not in the database, so get the album art directly // from the file. 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); return BitmapFactory.decodeStream(in, null, sBitmapOptions); } catch (FileNotFoundException ex) { // The album art thumbnail does not actually exist. Maybe the user deleted it, or // maybe it never existed to begin with. 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 ex) { } } } return null; } private static Bitmap getArtworkFromFile(Context context, long songid, long albumid) { Bitmap bm = null; byte [] art = null; String path = 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) { } if (bm != null) { mCachedBit = bm; } 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.play_img_default), null, opts); } private static final Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart"); private static final BitmapFactory.Options sBitmapOptions = new BitmapFactory.Options(); private static Bitmap mCachedBit = null;

获取cursor:

myCur = getContentResolver().query( MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media._ID, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.ALBUM_ID}, null,null, null); myCur.moveToPosition(position);

设置专辑封面图片：

long songid = myCur.getLong(3); long albumid = myCur.getLong(7); Bitmap bm = MusicUtils.getArtwork(this, songid, albumid,true); if(bm != null){ Log.d(TAG,"bm is not null=========================="); playImg.setImageBitmap(bm); }else{ Log.d(TAG,"bm is null============================"); }