Difference between dp, dip, sp, px

Screen density is the amount of pixels within an area (like inch) of the screen. Generally it is measured in dots-per-inch (dpi). Screen density is grouped as low, medium, high and extra high. Resolution is the total number of pixels in the screen.
dp: Density Independent Pixel, it varies based on screen density. In 160 dpi screen, 1 dp = 1 pixel. Except for font size, use dp always.
dip: dip == dp. In earlier Android versions dip was used and later changed to dp.
sp: Scale Independent Pixel, scaled based on user’s font size preference. Fonts should use sp.
Always use dp and sp only. sp for font sizes and dp for everything else.

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