Question

I have read http://developer.android.com/guide/practices/screens_support.html and http://developer.android.com/reference/android/util/DisplayMetrics.html and I somehow left with a gap here.

1. How is the transition from DisplayMetrics.densityDpi to for example String ("ldpi") done?
2. And more importantly from DisplayMetrics.widthPixels and DisplayMetrics.widthPixels to for example String ("large")

For the first I can whip up a switch statement easy enough. But the 2nd one is quite more complex. Does anybody know any details? Is there a function which does it?

I even searched the source and did not find anything. But maybe i looked for the wrong thing.

Answer 1

I figured it out, here the correct code (you need a valid android.content.Context instance in attribute context):

     final android.view.WindowManager windowManager =
        (android.view.WindowManager) this.context
           .getSystemService (android.content.Context.WINDOW_SERVICE);
     final android.util.DisplayMetrics metrics = new android.util.DisplayMetrics ();
     final android.content.res.Resources resources = this.context.getResources ();
     final android.content.res.Configuration config = resources.getConfiguration ();

     windowManager.getDefaultDisplay ().getMetrics (metrics);

     final int density = metrics.densityDpi;
     final int size =
        config.screenLayout & android.content.res.Configuration.SCREENLAYOUT_SIZE_MASK;
     final String densityText;
     final String sizeText;

     switch (density)
     {
        case android.util.DisplayMetrics.DENSITY_LOW:
        {
           densityText = "ldpi";
           break;
        }
        case android.util.DisplayMetrics.DENSITY_MEDIUM:
        {
           densityText = "mdpi";
           break;
        }
        case android.util.DisplayMetrics.DENSITY_HIGH:
        {
           densityText = "hdpi";
           break;
        }
        case android.util.DisplayMetrics.DENSITY_XHIGH:
        {
           densityText = "xhdpi";
           break;
        }
        default:
        {
           densityText = "unknown";
           break;
        }
     } // switch

     switch (size)
     {
        case android.content.res.Configuration.SCREENLAYOUT_SIZE_SMALL:
        {
           sizeText = "small";
           break;
        }
        case android.content.res.Configuration.SCREENLAYOUT_SIZE_NORMAL:
        {
           sizeText = "normal";
           break;
        }
        case android.content.res.Configuration.SCREENLAYOUT_SIZE_LARGE:
        {
           sizeText = "large";
           break;
        }
        case android.content.res.Configuration.SCREENLAYOUT_SIZE_XLARGE:
        {
           sizeText = "xlarge";
           break;
        }
        default:
        {
           sizeText = "unknown";
           break;
        }
     } // switch