如何使用方形毕加索库加载视频缩略图？

Question

目前我正在使用picasso将MediaStore图像缩略图加载到ListView中，并带有以下代码段:( video.getData()返回图像的实际路径，例如mnt/sdcard/...）

Picasso.with(this.context)
       .load(new File(photo.getData()))
       .resize(50, 50).config(config)
       .centerCrop()
       .into(viewHolder.imageViewItem);

现在我只是通过传递video.getData()而不是photo.getData()而无法加载MediaStore视频缩略图？

Answer 1

首先，您需要创建Video RequestHandler

public class VideoRequestHandler extends RequestHandler{
    public String SCHEME_VIDEO="video";
    @Override
    public boolean canHandleRequest(Request data) 
    {
        String scheme = data.uri.getScheme();
        return (SCHEME_VIDEO.equals(scheme));
    }

    @Override
    public Result load(Request data, int arg1) throws IOException 
    {
         Bitmap bm = ThumbnailUtils.createVideoThumbnail(data.uri.getPath(), MediaStore.Images.Thumbnails.MINI_KIND);
         return new Result(bm,LoadedFrom.DISK);  
    }
}

之后

 VideoRequestHandler videoRequestHandler;
 Picasso picassoInstance;

只构建一次

 videoRequestHandler = new VideoRequestHandler();
 picassoInstance = new Picasso.Builder(context.getApplicationContext())
  .addRequestHandler(videoRequestHandler)
  .build();

然后从路径加载文件

 picassoInstance.load(VideoRequestHandler.SCHEME_VIDEO+":"+filepath).into(holder.videoThumbnailView);

Answer 2

之前，您有两种选择：

1）事先进行呼叫，例如检索视频并存储位图：

Bitmap thumbnailBitmap = MediaStore.Video.Thumbnails.getThumbnail(content, id, MediaStore.Video.Thumbnails.MINI_KIND, options);

2）创建自定义下载器（未针对本地媒体进行验证）

但现在，使用Picasso 2.4，您可以创建一个RequestHandler。您可以查看此页面，例如：http://blog.jpardogo.com/requesthandler-api-for-picasso-library/

在我目前的用法中，我获取缩略图路径，然后使用该路径调用Picasso。为了获得缩略图路径，我提到：android get video thumbnail PATH, not Bitmap。

Answer 3

public void bindTo(MediaListHolder mediaListRowHolder, int i) {
    DataPictures message = itemList.get(i);
    try {
        Uri uri = Uri.fromFile(new File(message.getFilePath()));
        if (message.getFileType().equalsIgnoreCase("video")) {
            Bitmap bmThumbnail = ThumbnailUtils.extractThumbnail(ThumbnailUtils.createVideoThumbnail(message.getFilePath(),
                    MediaStore.Video.Thumbnails.FULL_SCREEN_KIND), MAX_WIDTH, MAX_HEIGHT);
            mediaListRowHolder.thumbnail.setImageBitmap(bmThumbnail);
        } else {
            Picasso.with(ApplicationSingleton.getInstance()).load(uri)
                    .resize(size, size)
                    .placeholder(R.drawable.logo_slogan)
                    .into(mediaListRowHolder.thumbnail);
        }
        Log.i(TAG, "bindTo: ");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 4

注意 - 如果您只是想在图像视图中显示缩略图并且不在其上应用任何额外的毕加索功能，请按照此注释进行操作。我只是稍微修改它以显示圆形缩略图因为它看起来很酷。

不要使用毕加索。这是一个非常简单的方法。

videoPathUrl = /*your Video File Url */
Bitmap bMap = ThumbnailUtils.createVideoThumbnail(videoPathUrl , MediaStore.Video.Thumbnails.MICRO_KIND);
bMap = transformBitmapToCircularBitmap(bMap);
yourImageView.setImageBitmap(bMap);

和transformBitmapToCircularBitmap函数如下 -

public static Bitmap transformBitmapToCircularBitmap(Bitmap source)
{
    int size = Math.min(source.getWidth(), source.getHeight());

    int x = (source.getWidth() - size) / 2;
    int y = (source.getHeight() - size) / 2;

    Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
    if (squaredBitmap != source) {
        source.recycle();
    }

    Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());

    Canvas canvas = new Canvas(bitmap);
    Paint paint = new Paint();
    BitmapShader shader = new BitmapShader(squaredBitmap,
            BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
    paint.setShader(shader);
    paint.setAntiAlias(true);

    float r = size / 2f;
    canvas.drawCircle(r, r, r, paint);

    squaredBitmap.recycle();
    return bitmap;
}