패키지 정보 가져오기

ArrayList<PackageInfo> packages = new ArrayList<PackageInfo>(); 
PackageManager pm; 

void getPackeges() { 
    pm = (PackageManager) this.getPackageManager(); 
    List<PackageInfo> allPackages = pm.getInstalledPackages(PackageManager.GET_PERMISSIONS);

    for (int i = 0; i < allPackages.size(); i++)
        if (!isSystemApplication(allPackages.get(i))) 
            packages.add(allPackages.get(i)); 
} 

boolean isSystemApplication(PackageInfo packinfo) { 
    return (packinfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0 ? true : false;
}