dp : Density Independent Pixels

redd

dp : Density Independent Pixels
You might be familiar with a pixel, which is a small illuminated area on a screen. Screens are essentially made up of hundreds of thousands of these pixels.
Well, better screens will often have more pixels in the same amount of space. The number of pixels in a fixed space is known as the screen's pixel density. In case you're wondering, 48dp translates to approximately 9mm in physical size.

redd

Make touch targets 48 dp at least.
像「按鈕」這類可以按的東西尺寸最少要 48 dp 才不會太小不好按。