修改Launcher3 图标为圆角

packages\apps\Launcher3\res\xml\folder_shapes.xml

packages\apps\Launcher3\src\com\android\launcher3\graphics\IconShape.java 

上述文件的解析在 IconShape中

private static List getAllShapes(Context context) {
        ArrayList result = new ArrayList<>();
        try (XmlResourceParser parser = context.getResources().getXml(R.xml.folder_shapes)) {

            // Find the root tag
            int type;
            while ((type = parser.next()) != XmlPullParser.END_TAG
                    && type != XmlPullParser.END_DOCUMENT
                    && !"shapes".equals(parser.getName()));

            final int depth = parser.getDepth();
            int[] radiusAttr = new int[] {R.attr.folderIconRadius};

            while (((type = parser.next(