How can I set "image2 and mSimpleDraweeView" in the source?

[wann2]

PipelineDraweeController controller = (PipelineDraweeController) Fresco.newDraweeControllerBuilder() .setImageRequest(request) .setOldController(image2.getController()) // other setters as you need .build(); mSimpleDraweeView.setController(controller);

I wonder what "image2 and mSimpleDraweeView" are. Cloud I get a sample source code?