获取多媒体文件信息

MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
metaRetriever.setDataSource(/* file descriptor or file path goes here */);
String height = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
String width = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);

if (context != null) {
            Cursor cursor = context.getContentResolver().query(
                    MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null,
                    null, null);
            if (cursor != null) {
                list = new ArrayList<Video>();
                while (cursor.moveToNext()) {
                    int id = cursor.getInt(cursor
                            .getColumnIndexOrThrow(MediaStore.Video.Media._ID));
                    String title = cursor
                            .getString(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));
                    String album = cursor
                            .getString(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.ALBUM));
                    String artist = cursor
                            .getString(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.ARTIST));
                    String displayName = cursor
                            .getString(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME));
                    String mimeType = cursor
                            .getString(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));
                    String path = cursor
                            .getString(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.DATA));
                    long duration = cursor
                            .getInt(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));
                    long size = cursor
                            .getLong(cursor
                                    .getColumnIndexOrThrow(MediaStore.Video.Media.SIZE));
                    Video video = new Video(id, title, album, artist, displayName, mimeType, path, size, duration);
                    list.add(video);
                }
                cursor.close();
            }
        }
http://blog.csdn.net/jwzhangjie/article/details/9027607