sprockets/src/main/java/net/sf/sprockets/content/res/Themes.java
@Nullable
    public static Drawable getDrawable(Context context, @AttrRes int attrId) {
        Drawable d = null;
        TypedArray a = context.obtainStyledAttributes(new int[]{attrId});
        try {
            d = a.getDrawable(0);
        } catch (UnsupportedOperationException e) {
            error("drawable", attrId, e);
        }
        a.recycle();
        return d;
    }
@Nullable
    public static Drawable getDrawable(Context context, @AttrRes int attrId) {
        Drawable d = null;
        TypedArray a = context.obtainStyledAttributes(new int[]{attrId});
        try {
            d = a.getDrawable(0);
        } catch (UnsupportedOperationException e) {
            error("drawable", attrId, e);
        }
        a.recycle();
        return d;
    }
Get the Drawable specified by the attribute in the Context's theme.

@return null if the drawable does not exist
@since 4.0.0