I am working in Android Studio and am trying to get the ID of the selected radio button and then store the ID in a string. Is this possible?

I have tried replacing the .getText() method below with .getId() but it wont let me store it as a string:

    RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int checkedId)
        {
            RadioButton checkedRadioButton = (RadioButton) findViewById(checkedId);
            String text = checkedRadioButton.getText().toString();
            Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
        }
    });