Fresco修改decoder，解决超大图显示模糊的问题。

private void setImageUrl() {
    ImageRequest request = ImageRequestBuilder.newBuilderWithSource(Uri.parse(model.getImage()))
            .setImageDecodeOptions(Utils.getFileTypeIsGif(model.getImage()) ? null ://null表示使用原有默认decoder
                    ImageDecodeOptions.newBuilder()
                            .setCustomImageDecoder(new ImageDecoder() {
                                @Override
  public CloseableImage decode(EncodedImage encodedImage, int length, QualityInfo qualityInfo, ImageDecodeOptions options) {
                                    Bitmap bitmap = null;
 if (encodedImage.getHeight() > Utils.dip2px(manager.getContext(), 150)) {
                                        int height = Utils.dip2px(manager.getContext(), 150);
 int width = Utils.getWidth(manager.getContext());
  width = width > encodedImage.getWidth() ? encodedImage.getWidth() : width;
  SkiaImageRegionDecoder inDecoder = new SkiaImageRegionDecoder();
  Rect region = new Rect();
  region.left = (encodedImage.getWidth() - width) / 2;
  region.right = region.left + width;
  region.top = (encodedImage.getHeight() - height) / 2;
  region.bottom = region.top + height;
 try {
                                            inDecoder.init(manager.getContext(), Uri.parse("file://" + FrescoUtils.getImageFileOnDisk(Uri.parse(model.getImage())).getAbsolutePath()));
  bitmap = inDecoder.decodeRegion(region, 1);
  } catch (Exception e) {
                                            LogInfo.LogOut(e);
  }
                                    }
                                    if (bitmap == null) {//TODO 此处最好使用原有默认decoder
                                        bitmap = BitmapFactory.decodeStream(encodedImage.getInputStream());
  }
                                    return new CloseableStaticBitmap(
                                            bitmap,
  SimpleBitmapReleaser.getInstance(),
  ImmutableQualityInfo.FULL_QUALITY,
  0);

  }
                            })
                            .build())
            .build();
  DraweeController controller = Fresco.newDraweeControllerBuilder()
            .setImageRequest(request)
            .setAutoPlayAnimations(Utils.getFileTypeIsGif(model.getImage()))
            .setOldController(image.getController())
            .setControllerListener(new BaseControllerListener())
            .build();
  image.setController(controller);
}