如何在自定义启动器上安装图标包？

我正在尝试在自定义启动器上安装图标包，我已阅读此说明如何安装图标包 https://stackoverflow.com/questions/31490630/how-to-load-icon-from-icon-pack但我无法理解如何使用该类，这就是我所做的：

IconPackManager ic = new IconPackManager();
HashMap<String, IconPackManager.IconPack> map = new HashMap<String, IconPackManager.IconPack>(ic.getAvailableIconPacks(false));
Iterator it = map.entrySet().iterator();
Drawable d = null;
String packName = null;
IconPackManager.IconPack packIcon = null;
    while (it.hasNext()) {
       Map.Entry pair = (Map.Entry)it.next();
       packName = (String)pair.getKey();
       packIcon = (IconPackManager.IconPack)pair.getValue();
       d = packIcon.getDrawableIconForPackage(packName, iconDrawable);
       setIcon(d);
    }

解决了这个：

String packName = null;
IconPackManager.IconPack packIcon = null;

IconPackManager ic = new IconPackManager();
HashMap<String, IconPackManager.IconPack> map = ic.getAvailableIconPacks(true);
Iterator it = map.entrySet().iterator();


        while (it.hasNext()) {
            Map.Entry pair = (Map.Entry)it.next();
            packName = (String)pair.getKey(); //Get icon pack name (app package)

            packIcon = (IconPackManager.IconPack)pair.getValue(); //Get icons

            if(packIcon.getDrawableIconForPackage("YourTargetPackageName", yourStandardIcon) != null) {

            //Your own method for set icon   
            setIcon(packIcon.getDrawableIconForPackage("YourTargetPackageName", yourStandardIcon));

            }else{
                //Your own method for set icon   
                setIcon(yourStandardIcon);
            }
        }