The reason we work with millimeters is mostly for uniformity across
platforms as a universal standard. Changing to the Android DIP standard
would be problematic as all the tooling/theming etc is based around
millimeters so we can expose that in an API but not leverage this. It
wouldn't help.
Are you talking about this method? :
@Override
public int getDeviceDensity() {
DisplayMetrics metrics = new DisplayMetrics();
if (getActivity() != null) {
getActivity().getWindowManager().getDefaultDisplay().getMetrics(
metrics);
} else {
metrics = getContext().getResources().getDisplayMetrics();
}
if(metrics.densityDpi < DisplayMetrics.DENSITY_MEDIUM) {
return Display.DENSITY_LOW;
}
if(metrics.densityDpi < 213) {
return Display.DENSITY_MEDIUM;
}
// 213 == TV
if(metrics.densityDpi >= 213 && metrics.densityDpi <=
DisplayMetrics.DENSITY_HIGH) {
return Display.DENSITY_HIGH;
}
if(metrics.densityDpi > DisplayMetrics.DENSITY_HIGH &&
metrics.densityDpi
< 400) {
return Display.DENSITY_VERY_HIGH;
}
if(metrics.densityDpi >= 400 && metrics.densityDpi < 560) {
return Display.DENSITY_HD;
}
if(metrics.densityDpi >= 560 && metrics.densityDpi <= 640) {
return Display.DENSITY_2HD;
}
if(metrics.densityDpi > 640) {
return Display.DENSITY_4K;
}
return Display.DENSITY_MEDIUM;
}
In this case using the densityDpi field makes a lot of sense as it's the
officially sanctioned Android API that does exactly this.
I'm talking about this method only:
public int convertToPixels(int dipCount, boolean horizontal) {
DisplayMetrics dm = getContext().getResources().getDisplayMetrics();
float ppi = dm.density * 160f;
return (int) (((float) dipCount) / 25.4f * ppi);
}
Right now this is defensive code designed against the bugs in dm.xdpi/ydpi
which I'm assuming you want to use instead. To work correctly you would
need to guard against misconfigured xdpi by checking that the range
difference isn't too big.
Notice that this method is usually invoked with *1000 of the value asked
and then converted to a floating point value for higher accuracy.
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