Why are my images compressed?

I'm using layout xml file for the UI. But the images are compressed and the qualities have lo开发者_如何学JAVAst in some level.

My code is like this:

<ImageView
    android:layout_width="480px"
    android:layout_height="717px"
    android:layout_x="0px"
    android:layout_y="45px"
    android:scaleType="fitXY"
    android:src="@drawable/e4" />

The drawable is actually 480x717.

What's the problem here? Is it due to the fitXY?

---

Of course it is.

You say you want some dimensions, but then you say you want to scale it.

So it scales it.