使用fresco(facebook图像库)从整个原始图像中获取缩放部分

您应该查看Fresco文档 here

他们说:

要缩放,只需指定SimpleDraweeView的layout_width和layout_height,就像对任何Android视图一样。然后指定比例类型。

要调整大小,您可以这样做:

Uri uri = "your uri";

int width = 50, height = 50;
ImageRequest request = ImageRequestBuilder.newBuilderWithSource(uri)
.setResizeOptions(new ResizeOptions(width, height))
.build();
PipelineDraweeController controller = Fresco.newDraweeControllerBuilder()
.setOldController(mDraweeView.getController())
.setImageRequest(request)
.build();
mSimpleDraweeView.setController(controller);