I am trying to determine the physical size of a screen in inches.
Normally, I could do something like this:
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics( metrics );
Then use metrics.widthPixels and metrics.heightPixels. Now that I
know the width and height in pixels, I should be able to calculate
size in inches if I know the density. Easy enough, metrics.xdpi and
metrics.ydpi.
Then screen dimension in inches should be:
widthInInches = metrics.widthPixels / metrics.xdpi;
heightInInches = metrics.heightPixels / metrics.ydpi;
Seems simple enough except that it doesn't work.
On a Motorola Droid, the system reports back: xdpi and ydpi as 96
(which cannot be true).
And the screen resolution as: 480 x 854. Which results in a width of
5" x 8.9" -- which as I'm holding this in my hand right now, I must
say - cannot be correct.
Any ideas on how to accurately calculate this?
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