Android 获取本地视频首帧及视频大小

1、获取视频首帧

 MediaMetadataRetriever media = new MediaMetadataRetriever();
  //videoPath 视频路径
 media.setDataSource(videoPath);
  // 拿到 bitmap
 Bitmap bitmap = media.getFrameAtTime();

 imageCover.setImageBitmap(bitmap);

2、获取视频大小

//格式化
public String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return size + "B";
        }

        double megaByte = kiloByte / 1024;
        if (megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "KB";
        }

        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "MB";
        }

        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "GB";
        }
        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
                + "TB";
    }
// file.length()  字节长度
File file = new File(videoPath);
String s = getFormatSize(file.length())；