Android convert physical screen measurements to density one (not runtime!)

Question

So, as far as I know, we can use next formula:
density = SQRT(width*width+height*height)/screen_size.

For example, Nexus 6 (6.0", 1_440*2_560) should give 490 dpi (approx.), but Android Studio Preview screen shows this device with 560 dpi.

What am I missing?

http://stackoverflow.com/q/28477572/794088 & http://stackoverflow.com/questions/30041594/how-does-quantized-density-affect-image-resource-selection-and-scaling — petey, Apr 26 '16 at 16:16

score 3 · Answer 1 · answered Apr 26 '16 at 16:33

Although each device has its own screen density, Android includes the device into the nearest density "bucket":

420 dpi
560 dpi
xhdpi
xxhdpi

As seen in Android Studio:

Although the Nexus 6 and 6P have different physical screen densities, the same drawable resource will be used for both devices.

score 1 · Accepted Answer · answered Apr 26 '16 at 16:25

1

About the Nexus 6, the manufacturer density is 560 but the physical density is about 493. Always think about the manufacturer density before think scale factor.

answered Apr 26 '16 at 16:25

josedlujan

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Android convert physical screen measurements to density one (not runtime!)

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