device_metrics_bucket_table.md

Density Qualifier	Denisty Value	Scale	Description
ldpi	~120dpi	0.75x	Resources for low-density (ldpi) screens.
mdpi	~160dpi	1x	Resources for medium-density (mdpi) screens. (This is the baseline density.)
hdpi	~240dpi	1.5x	Resources for high-density (hdpi) screens.
xhdpi	~320dpi	2x	Resources for extra-high-density (xhdpi) screens.
xxhdpi	~480dpi	3x	Resources for extra-extra-high-density (xxhdpi) screens.
xxxhdpi	~640dpi	4x	Resources for extra-extra-extra-high-density (xxxhdpi) uses.
nodpi	n/a	n/a	Resources for all densities. These are density-independent resources. The system does not scale resources tagged with this qualifier, regardless of the current screen's density.
tvdpi	~213dpi	1.33x	Resources for screens somewhere between mdpi and hdpi; approximately 213dpi. This is not considered a "primary" density group. It is mostly intended for televisions and most apps shouldn't need it—providing mdpi and hdpi resources is sufficient for most apps and the system will scale them as appropriate. If you find it necessary to provide tvdpi resources, you should size them at a factor of 1.33*mdpi. For example, a 100px x 100px image for mdpi screens should be 133px x 133px for tvdpi.