PPI/DPI计算公式
Density = sqrt((wp * wp) + (hp * hp)) / di
where
wp is width resolution in pixels,
hp is height resolution in pixels, and
di is diagonal size in inches.
DENSITY 取值范围
ro.sf.lcd_density 可以为以下数值
| 范围 | 常量 | 具体数值 |
|---|
| 120 dpi | DENSITY_LOW | 120 |
| (120 dpi,160 dpi) | DENSITY_140 | 140 |
| 160 dpi | DENSITY_MEDIUM/DENSITY_DEFAULT | 160 |
| (160 dpi,240 dpi) | DENSITY_180 | 180 |
| (160 dpi,240 dpi) | DENSITY_200 | 200 |
| (160 dpi,240 dpi) | DENSITY_220 | 220 |
| 240 dpi | DENSITY_HIGH | 240 |
| (240 dpi,320 dpi) | DENSITY_260 | 260 |
| (240 dpi,320 dpi) | DENSITY_280 | 280 |
| (240 dpi,320 dpi) | DENSITY_300 | 300 |
| 320 dpi | DENSITY_XHIGH | 320 |
| (320 dpi,480 dpi) | DENSITY_340 | 340 |
| (320 dpi,480 dpi) | DENSITY_360 | 360 |
| (320 dpi,480 dpi) | DENSITY_400 | 400 |
| (320 dpi,480 dpi) | DENSITY_420 | 420 |
| (320 dpi,480 dpi) | DENSITY_440 | 440 |
| (320 dpi,480 dpi) | DENSITY_450 | 450 |
| 480 dpi | DENSITY_XXHIGH | 480 |
| (480 dpi,640 dpi) | DENSITY_560 | 560 |
| (480 dpi,640 dpi) | DENSITY_600 | 600 |
| 640 dpi | DENSITY_XXXHIGH | 640 |
像素计算
px = dp * (dpi / 160)
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