Android: DialogFragment embedded or as Dialog

CustomDialogFragment.java

public class CustomDialogFragment extends DialogFragment {

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        if (isInLayout())
            return super.onCreateDialog(savedInstanceState);

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
                .setView(R.layout.my_custom_layout)
                .setTitle(R.string.my_title)
                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO implement
                    }
                });

        return builder.create();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        if (!isInLayout())
            return super.onCreateView(inflater, container, savedInstanceState);

        View v = inflater.inflate(R.layout.my_custom_layout, container);
        return v;
    }
}