How does scaleType and wrap_content determine ImageView width and height?

Question

I'm trying to understand how layout_width/height when sets to "wrap_content", "goes" together with scaleType ? AFAIK, scaleType (let's say 'center_fit' ) responsible of scaling up or down image size, but when width or height is set to wrap_content , isn't it means that the width & height of the ImageView will be calculated from the image (drawable) size? So why in this situation, the drawable will be scaled at all?

Answer 1

scaleType 定义了在宽度和高度不匹配/不合适的情况下您希望图像如何显示，例如 fitCenter 使其居中并适合，而 fitXY 如果它有空格则拉伸它。