获取视频缩略图

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public static ArrayList<PFile> batchBuildThumbnail(final Context ctx, final ArrayList<File> files) {
        ArrayList<PFile> result = new ArrayList<PFile>();

        for (File f : files) {
            PFile pf = new PFile();
            try {
                if (f.exists() && f.canRead()) {
                    //取出视频的一帧图像
                    Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(ctx, f.getAbsolutePath(), Video.Thumbnails.MINI_KIND);
                    if (bitmap == null) {
                        //缩略图创建失败
                        bitmap = Bitmap.createBitmap(ThumbnailUtils.TARGET_SIZE_MINI_THUMBNAIL_WIDTH, ThumbnailUtils.TARGET_SIZE_MINI_THUMBNAIL_HEIGHT, Bitmap.Config.RGB_565);
                        Log.e(TAG, "batchBuildThumbnail createBitmap faild : " + f.getAbsolutePath());
                    }

                    pf.width = bitmap.getWidth();
                    pf.height = bitmap.getHeight();

                    //缩略图
                    bitmap = ThumbnailUtils.extractThumbnail(bitmap, ThumbnailUtils.dipToPX(ctx, ThumbnailUtils.TARGET_SIZE_MICRO_THUMBNAIL_WIDTH), ThumbnailUtils.dipToPX(ctx, ThumbnailUtils.TARGET_SIZE_MICRO_THUMBNAIL_HEIGHT), ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
                    if (bitmap != null) {
                        File thum = new File(f.getParent(), f.getName() + ".jpg");
                        pf.thumb = thum.getAbsolutePath();
                        //thum.createNewFile();
                        FileOutputStream iStream = new FileOutputStream(thum);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 85, iStream);
                        iStream.close();
                    }

                    if (bitmap != null)
                        bitmap.recycle();
                }
            } catch (Exception e) {
                Log.e(TAG, e);
                continue;
            } finally {
                result.add(pf);
            }
        }

        return result;