It is possible to capture the click result in a Dialogfragment

Question

I’m new in android development and have this doubt.
I’m creating a DialogFragment with an interface to capture user choice.

This is my dialog box next to the interface:

public class Opcoes extends DialogFragment {
  private String valor = "";
  private OpcoesListener listener;


  public void setValor(String valor) {
    this.valor = valor;
  }

  public String getValor() {
    return valor;
  }


  @Override
  public void onAttachFragment(Fragment childFragment) {
    super.onAttachFragment(childFragment);
    try {
      if (childFragment instanceof Opcoes) {
        listener = (OpcoesListener) childFragment;
      }

    } catch (ClassCastException e) {
      throw new ClassCastException(childFragment.toString() + "must implement OpcoesListner");
    }

  }
  public interface OpcoesListener {
    public void onDialogPositiveClick(DialogFragment dialog);
    public void onDialogNegativeClick(DialogFragment dialog);
  }


  @NonNull
  @Override
  public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    LayoutInflater inflater = getActivity().getLayoutInflater();
    View view = inflater.inflate(R.layout.dialog_opcoes, null);

    builder.setView(view);
    builder.setMessage("Minha mensagem");
    builder.setPositiveButton(R.string.sim, new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int which) {
        setValor("positivo");
        listener.onDialogPositiveClick(Opcoes.this);
      }
    });
    return builder.create();
  }
}

This is the passage in the fragment where I call the dialogue in the event of click.

btnContinuar.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        if (radioTodos.isChecked()) {
          showNoticeDialog();
        }
      }
    }

    public void showNoticeDialog() {

      DialogFragment dialog = new Opcoes();
      dialog.show(getFragmentManager(), "Dialog");
    }

This is the error it returns when I click the positive button in the dialog box.

E/Androidruntime: FATAL EXCEPTION: main Process: br.com.simtk.simtkrelatorio, PID: 9189 java.lang.Nullpointerexception: Attempt to invoke interface method 'void br.com.simtk.simtkreportario.util.Options$Opcoeslistener.onDialogPositiveClick(androidx.fragment.app.Dialogfragment)' on a null Object Reference at br.com.simtk.simtkreportario.util.Options$1.onClick(Options.java:70) at androidx.appcompat.app.Alertcontroller$Buttonhandler.handleMessage(Alertcontroller.java:167) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.Activitythread.main(Activitythread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.Internal.os.Zygoteinit$Methodandargscaller.run(Zygoteinit.java:866) at com.android.Internal.os.Zygoteinit.main(Zygoteinit.java:756)

Any note to solve the problem is valid.