媒体文件元数据：获取时长和生成缩略图

        MediaMetadataRetriever media = new MediaMetadataRetriever();
        media.setDataSource(videoPath);
    
          Bitmap bitmap = media.getFrameAtTime();
          File videoFile = new File(videoPath);
          File parentFile = videoFile.getParentFile();
          String videoName = videoFile.getName();
          String picName = videoName;
          if (videoName.contains(".")) {
            picName = videoName.split("\\.")[0];
          }
          picName += ".jpeg";
          File picFile = new File(parentFile, picName);
          try {
            FileOutputStream fileOutputStream = new FileOutputStream(picFile);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 30, fileOutputStream);
            fileOutputStream.close();
          } catch (IOException e) {
            e.printStackTrace();
          }
          Log.i(TAG, "getVideoThumbnail: 生成图片地址为:" + picFile.getAbsolutePath());

          String s = media.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
          try {
            int i = Integer.parseInt(s);
            videoLength = i / 1000;
            if (i % 1000 != 0) {
              videoLength++;
            }
          } catch (NumberFormatException e) {
            e.printStackTrace();
          }
        media.release();