How to get value from a RadioButon inside a RadioGroup to save in the bank

I wanted to know how I get the value of a RadioButton to save it to the sqlite bank. In the example below the instructor does as follows:

public class FormularioHelper {

private Aluno aluno;

public FormularioHelper(FormularioActivity activity) {
    campoNome = (EditText) activity.findViewById(R.id.formulario_nome);
    campoEndereco = (EditText) activity.findViewById(R.id.formulario_endereco);
    campoTelefone = (EditText) activity.findViewById(R.id.formulario_telefone);
    campoSite = (EditText) activity.findViewById(R.id.formulario_site);
    campoNota = (RatingBar) activity.findViewById(R.id.formulario_nota);
    campoFoto = (ImageView) activity.findViewById(R.id.formulario_foto);
    aluno = new Aluno();
}

public Aluno pegaAluno() {
    aluno.setNome(campoNome.getText().toString());
    aluno.setEndereco(campoEndereco.getText().toString());
    aluno.setTelefone(campoTelefone.getText().toString());
    aluno.setSite(campoSite.getText().toString());
    aluno.setNota(Double.valueOf(campoNota.getProgress()));
    aluno.setCaminhoFoto((String) campoFoto.getTag());
    return aluno;
}}

Mine is partially like this:

public class FormularioProcessoHelper {
    private ImageView ivCaminhoFoto;
    private Spinner spPromotores;
    private RadioButton rbFavoravel;
    private RadioButton rbDesfavoravel;
    private RadioGroup radioGroup;
    private EditText edtObservacao;
    private Button btnDataProcesso;

    private Processo processo;

    public FormularioProcessoHelper(FormularioProcessoActivity activity) {
        ivCaminhoFoto = (ImageView) activity.findViewById(R.id.iv_foto_selecionada);
        spPromotores = (Spinner) activity.findViewById(R.id.spinner_promotores);
        rbFavoravel = (RadioButton) activity.findViewById(R.id.posicao_judicial_favoravel);
        rbDesfavoravel = (RadioButton) activity.findViewById(R.id.posicao_judicial_desfavoravel);
        edtObservacao = (EditText) activity.findViewById(R.id.edt_observacao);
        btnDataProcesso = (Button) activity.findViewById(R.id.btn_data);

        processo = new Processo();
    }

    public Processo pegaProcessoPraCadastro() {
        Processo processo = new Processo();
        processo.setCaminhoFoto((String) ivCaminhoFoto.getTag());
        processo.setPosicao(radioGroup.); // AQUI, QUERIA PEGAR O VALOR DO RADIOBUTTON SELECIONADO
        processo.setPromotor(spPromotores.getSelectedItemPosition()); //AQUI --//-- SPINNER SELECIONADO
        processo.setDataProcesso(btnDataProcesso.PegarAData()); // AQUI --//-- A DATA SETADA PELO USUARIO
        processo.setObservacao(edtObservacao.getText().toString());
        return processo;
    }
}

The problem is, I did not find the methods to get these values. Both Spinner and RadioButton's. The commented lines are where the errors are!

My model class Process:

public class Processo implements Serializable {
    private Long id;
    private String caminhoFoto;
    private Usuario promotor;
    private String observacao;
    private String dataProcesso;
    private PosicaoJudiciario posicao;

    public Usuario getPromotor() {
        return promotor;
    }

    public void setPromotor(Usuario promotor) {
        this.promotor = promotor;
    }

    public String getObservacao() {
        return observacao;
    }

    public void setObservacao(String observacao) {
        this.observacao = observacao;
    }

    public String getDataProcesso() {
        return dataProcesso;
    }

    public void setDataProcesso(String dataProcesso) {
        this.dataProcesso = dataProcesso;
    }

    public PosicaoJudiciario getPosicao() {
        return posicao;
    }

    public void setPosicao(PosicaoJudiciario posicao) {
        this.posicao = posicao;
    }

    public String getCaminhoFoto() {
        return caminhoFoto;
    }

    public void setCaminhoFoto(String caminhoFoto) {
        this.caminhoFoto = caminhoFoto;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public String toString() {
        return "Nome: " + getPromotor();
    }
}

My User Model class:

public class Usuario implements Serializable{

    private String nome;
    private String senha;
    private String email;
    private String matricula;

    public String getNome() {
        return nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    public String getSenha() {
        return senha;
    }

    public void setSenha(String senha) {
        this.senha = senha;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getMatricula() {
        return matricula;
    }

    public void setMatricula(String matricula) {
        this.matricula = matricula;
    }
}