Not showing EULA Dialog after application update

Question

EULA dialog shows correctly until there is an application update. If the user has already accepted the EULA dialog it should not show again after the update.

public class AppEULA {
    private String EULA_PREFIX = "appeula";
    private Activity mContext;

    private static final String TAG = MainActivity.class.getSimpleName();

    public AppEULA(Activity context) {
        mContext = context;
    }

    private PackageInfo getPackageInfo() {
        PackageInfo info = null;
        try {
            info = mContext.getPackageManager().getPackageInfo(
                    mContext.getPackageName(), PackageManager.GET_ACTIVITIES);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return info;
    }

    public void show() {
        PackageInfo versionInfo = null;
        try {
            versionInfo = mContext.getPackageManager()
                    .getPackageInfo(mContext.getPackageName(), 0);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

        // The eulaKey changes every time you increment the version number in
        // the AndroidManifest.xml
        final String eulaKey = EULA_PREFIX + versionInfo.versionCode;
        final SharedPreferences prefs = PreferenceManager
                .getDefaultSharedPreferences(mContext);

        boolean bAlreadyAccepted = prefs.getBoolean(eulaKey, false);
        if (bAlreadyAccepted == false) {
         ....
        show dialog


 .setPositiveButton(R.string.accept,
                            new Dialog.OnClickListener() {

                                @Override
                                public void onClick(
                                        DialogInterface dialogInterface, int i) {
                                    // Mark this version as read.
                                    SharedPreferences.Editor editor = prefs
                                            .edit();
                                    editor.putBoolean(eulaKey, true);
                                    editor.commit();

                                    // Close dialog
                                    dialogInterface.dismiss();

I expect the EULA dialog not to show after application update if the user has already accepted it.