Difference between “screen size” and “screen density” in Android?

Question

I have a few questions:

1. What is the screen size?

2. What is the screen density?

3. What is a differenc

Answer 1

screen size is about how many pixels you can show on screen.

Density is based on your device real size, if it's small and has a higher resolution, than the density is high cause you show more pixels in less physical space.

1.screen size concerns an absolute number of pixels. (check out wikipedia Image Resolution)

2.Density (aka Pixels per inch - PPI) concerns a relative number of pixels per inch. (check out the wikipedia Pixel Density)