private ArrayList<AppInfo> getInstalledApps(boolean getSystemPackages) {
        ArrayList<AppInfo> res = new ArrayList<AppInfo>();
        List<PackageInfo> packageInfoList = getPackageManager().getInstalledPackages(0);
        for (int i = 0; i < packageInfoList.size(); i++) {
            PackageInfo packageInfo = packageInfoList.get(i);
            if ((!getSystemPackages) && (packageInfo.versionName == null)) {
                continue ;
            }
            AppInfo appInfo = new AppInfo();
            appInfo.getAppname() = packageInfo.applicationInfo.loadLabel(getPackageManager()).toString();
            appInfo.getIcon() = packageInfo.applicationInfo.loadIcon(getPackageManager());
            res.add(appInfo);
        }
        return res;
    }