Set default checked Radio Button

Question

I'm creating a RadioGroup with RadioButtons dynamically and need to have one radio button checked by default.

I've done this by using both radioButton.setChecked(true) and radioButton.toggle();

The problem I have is that when I at runtime select another radio button the first one stays checked so I end up with two checked radio buttons in the radio group.

Has anyone had this problem and know how to solve it?

private RadioButton addRadioButton(String type, String price){
        RadioButton radio = new RadioButton(Order.this);
        radio.setText(type + " (" + Utils.formatCurrency(price) + ")");
        radio.setTextAppearance(Order.this, R.style.portalCellTextStyle);
        radio.setTextSize(TypedValue.COMPLEX_UNIT_SP, 10);
        radio.setTag(price);

        if(type.toLowerCase().equals("m"))
            radio.toggle();

        return radio;
    }

Answer 1

I know I'm late but for those who search for the answer like me this can be useful.

When you add RadioButton to a RadioGroup, you must set the button checked after adding it to the parent like:

RadioGroup radioGroup = new RadioGroup(getContext())
RadioButton radioButton = new RadioButton(getContext());
radioButton.setText("text");
mRadioGroup.addView(radioButton);
radioButton.setChecked(true);

If the view is checked before adding it to the parent, it will be impossible to uncheck it.