Android：通过单选按钮在单选组中的位置检查单选按钮

Question

I got the position of a radio in a radio group by using indexOfChild. How can I use this index to check the radio that has this particular index?

Answer 1

尝试这个

radioGroup.check(((RadioButton)radioGroup.getChildAt(index)).getId())

Answer 2

        for(i in listCategory.indices){
            if((categoryRadioGroup[i] as RadioButton).isChecked)
                Toast.makeText(myContext, "$i", Toast.LENGTH_SHORT).show()
        }