Fresco 获得Bitmap

ImageRequest imageRequest = ImageRequestBuilder
                            .newBuilderWithSource( Uri.parse(getFeedItem(position).feedImageUrl.get(index)))
                            .setProgressiveRenderingEnabled(true)
                            .build();

ImagePipeline imagePipeline = Fresco.getImagePipeline();
DataSource<CloseableReference<CloseableImage>>
                                    dataSource = imagePipeline.fetchDecodedImage(imageRequest,mContext);

 dataSource.subscribe(new BaseBitmapDataSubscriber() {

                                     @Override
                                     public void onNewResultImpl(@Nullable Bitmap bitmap) {
                                     // You can use the bitmap in only limited ways
                                     // No need to do any cleanup.

                                     }

                                     @Override
                                     public void onFailureImpl(DataSource dataSource) {
                                     // No cleanup required here.
                                            }
                                   },
                                    CallerThreadExecutor.getInstance());