@Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        RadioButton radio = (RadioButton)buttonView;
        if (radio != null) {
            buttonStart.setEnabled(true);
            if (checkedRadioButton == 0) {
                // nothing to uncheck, ony store the checked button
                checkedRadioButton = radio.getId();
            }
            else {
                RadioButton uncheckRadio = (RadioButton)findViewById(checkedRadioButton);
                uncheckRadio.setChecked(false);
                checkedRadioButton = radio.getId();
            }
        }
    }
    
    private boolean checkResult() {
        if (checkedRadioButton != 0) {
            if (R.id.id_radio_1 == checkedRadioButton) {
                if (progressBar1.getProgress() == 100) {
                    return true;
                }
            }
            else if (R.id.id_radio_2 == checkedRadioButton) {
                if (progressBar2.getProgress() == 100) {
                    return true;
                }                
            }
            else if (R.id.id_radio_3 == checkedRadioButton) {
                if (progressBar3.getProgress() == 100) {
                    return true;
                }                
            }
            else if (R.id.id_radio_4 == checkedRadioButton) {
                if (progressBar4.getProgress() == 100) {
                    return true;
                }                
            }
            else if (R.id.id_radio_5 == checkedRadioButton) {
                if (progressBar5.getProgress() == 100) {
                    return true;
                }                
            }
            else if (R.id.id_radio_6 == checkedRadioButton) {
                if (progressBar6.getProgress() == 100) {
                    return true;
                }                
            }
        }
        
        return false;
    }