[JAVA] Behavior noticed when adding RadioButton and initial check at the same time in code

I was addicted to RadioGroup and RadioButton

This is the first post.

I noticed it while working at Kotlin, so I output it appropriately.

Premise

Behavior you want

"* I want to add the initial value of the Radio Button that will be added *"

Often.

code

list = listOf(1, 2, 3)//Meaningful information
radioGroup = findById(R.id.radio_group) as RadioGroup
for (data in list){
    val radioButton = RadioButton(this)
    if (data == 1){
        //I want to use it as an initial value!
        radioButton.isChecked = true
    }
    radioGroup.addView(radioButton)
}

Looks good

The purpose I saw is checked and very good

checkedRadioButtonId cannot be taken correctly

Refact

list = listOf(1, 2, 3)//Meaningful information
radioGroup = findById(R.id.radio_group) as RadioGroup
for (data in list){
    val radioButton = RadioButton(this)
    //Register RadioButton as SubView immediately after declaration
    radioGroup.addView(radioButton)
    if (data == 1){
        //I want to use it as an initial value!
        radioButton.isChecked = true
    }
}

moved

I did it.

Impressions

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