Uncheck all RadioButton in a RadioButtonGroup

Question

What I wanted to achieve is this: Right after the activity starts, I want that no RadioButton is selected/checked.

My problem is this: When the activity starts, the

Answer 1

use this

RadioButton spec1=findViewById(yourRadioGroup.getCheckedRadioButtonId());
        if (spec1.isChecked())
        {
            spec1.setChecked(false);
        }