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Which is better to use in Android and why?
Load a .png file that is 1×1 and has, obviously, one pixel of one color (ie #000)
Use an .xml drawable that contains a solid rectangle of the same solid color (#000)
Use an .xml drawable that contains a solid rectangle of the same solid color (#000).
Why? Because that’s the point of the XML layouts, is to enable developers to quickly make changes to visuals (in this case colors) without having to open image-editing software.
If you were to really only load a 1×1 PNG then some could argue the PNG loading is faster, but in reality, this is never going to happen. The point here is that it will be stretched or manipulated in some way, or set to tile as a background and this will eventually be slower than defining a background color or shape in Android XML Layout.