Scale factor for xxhdpi android?

Question

according to http://developer.android.com/training/multiscreen/screendensities.html

The following scale factors are mentioned

xhdpi: 2.0 hdpi: 1.5 mdpi: 1.0 (baseline) ldpi: 0.75

I was wondering what the scale factor would be for xxhdpi?

Answer 1

In android.util.DisplayMetrics, you can see that scaling factor is 0.00625:

/**
 * Scaling factor to convert a density in DPI units to the density scale.
 * @hide
 */
public static final float DENSITY_DEFAULT_SCALE = 1.0f / DENSITY_DEFAULT;

Where as DENSITY_DEFAULT is 160 --> scaling factor = 1.0f / 160 = 0.00625.

sizeScale = DENSITY_DEFAULT_SCALE * DENSITY_DPI

From this:

• ldpi = 0.00625 * 120 -> 0.75
• mdpi = 0.00625 * 160 -> 1.0
• hdpi = 0.00625 * 240 -> 1.5
• xhdpi = 0.00625 * 320 -> 2.0
• xxhdpi = 0.00625 * 480 -> 3.0
• xxxhdpi = 0.00625 * 640 -> 4.0

Not exactly a rocket science, but hope this will be useful for someone :)

Answer 2

If you look at Metrics and Grids you'll see that xxhdpi is 480 dpi which is 3 times that of the baseline (mdpi @ 1.0). In other words the scale factor for xxhdpi is 3.0