tweak avatar corner radius for issue pockethub#21

The radius is actually fixed at 3 dip for all avatar sizes (similar to
what happens on the site at the moment). This looks ok to me at the
sizes I've viewed so far, including the 16dp 'assigned' avatar - the
rounding is more subtle.

Author: rtyley

app/src/main/java/com/github/mobile/android/util/AvatarHelper.java

@@ -38,13 +38,12 @@
  */
 public class AvatarHelper {
 
-    private static final int RADIUS = 8;
+    private static final float CORNER_RADIUS_IN_DIP = 3;
 
     private static final String TAG = "GHAU";
     private final static Pattern gravatarIdWithinUrl = Pattern.compile("/avatar/(\\p{XDigit}{32})");
 
-    @Inject
-    private Resources resources;
+    private final Resources resources;
 
     @Inject
     @Named("gravatarStore")
@@ -61,6 +60,15 @@ public ImageSession<String, Bitmap> load(Integer imageSize) {
                         }
                     });
 
+    private final float cornerRadius;
+
+    @Inject
+    public AvatarHelper(Resources resources) {
+        this.resources = resources;
+        cornerRadius = CORNER_RADIUS_IN_DIP * resources.getDisplayMetrics().density;
+    }
+
+
     /**
      * Sets the image on the ImageView to the user's avatar.
      *
@@ -89,7 +97,7 @@ public ScaledAndRoundedAvatarGenerator(int sizeInPixels) {
 
         public Drawable convert(Bitmap bitmap) {
             Bitmap scaledBitmap = createScaledBitmap(bitmap, sizeInPixels, sizeInPixels, true);
-            return new BitmapDrawable(resources, roundCornersAndOverlayOnWhite(scaledBitmap, RADIUS));
+            return new BitmapDrawable(resources, roundCornersAndOverlayOnWhite(scaledBitmap, cornerRadius));
         }
 
     }

app/src/main/java/com/github/mobile/android/util/Image.java

@@ -168,7 +168,7 @@ public static void setImage(final File image, final ImageView view) {
      * @param radius
      * @return rounded corner bitmap
      */
-    public static Bitmap roundCornersAndOverlayOnWhite(final Bitmap source, final int radius) {
+    public static Bitmap roundCornersAndOverlayOnWhite(final Bitmap source, final float radius) {
         int width = source.getWidth();
         int height = source.getHeight();