How do I check if an app is a non-system app in Android?

PackageManager pm = mcontext.getPackageManager();
List<PackageInfo> list = pm.getInstalledPackages(0);

for(PackageInfo pi : list) {
    ApplicationInfo ai = pm.getApplicationInfo(pi.packageName, 0);

    System.out.println(">>>>>>packages is<<<<<<<<" + ai.publicSourceDir);

    if ((ai.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
        System.out.println(">>>>>>packages is system package"+pi.packageName);          
    }
}

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