Works in Netbeans but not in Android Studio

Question

The following code works for when the user leaves an editText of the form blank. The code worked in Netbeans but on Androidstudio when running the APK with a blank field it shows the message that the APP has stopped working. Follows the code:

//In Netbeans

BigDecimal cota = null;
BigDecimal prazo = null;
BigDecimal reserva = null;
BigDecimal adm = null;

try {
    cota = new BigDecimal(jTextField1.getText());
    prazo = new BigDecimal(jTextField2.getText());
    reserva = new BigDecimal(jTextField3.getText());
    adm = new BigDecimal(jTextField4.getText());

} catch (NumberFormatException e) {
    jLabel5.setText("Os valores não podem estar vazios!");
}

//On Android

BigDecimal cota = null;
            BigDecimal prazo = null;
            BigDecimal reserva = null;
            BigDecimal adm = null;
            BigDecimal vida = null;



try{
                cota = new BigDecimal(edtCota.getText().toString());
                prazo = new BigDecimal(edtPrazo.getText().toString());
                reserva = new BigDecimal(edtReserva.getText().toString());
                adm = new BigDecimal(edtAdm.getText().toString());
                vida = new BigDecimal(edtVida.getText().toString());

            }catch(NumberFormatException erro){

                AlertDialog.Builder janelaVazio = new AlertDialog.Builder(Consorcio.this);
                janelaVazio.setMessage("Preencha todos os campos");
                janelaVazio.setNeutralButton("FECHAR", null);
                janelaVazio.show();
            }