Change color of a radio button

Question

I am developing an quiz based app. There will be 1 question and 4 option(radio buttons). If user select any wrong answer then I want to turn that radio button color to Red.

Answer 1

For kotlin user

Create an extension

fun RadioButton.setCircleColor() {
    val colorStateList = ColorStateList(
        arrayOf(
            intArrayOf(-android.R.attr.state_checked), // unchecked
            intArrayOf(android.R.attr.state_checked)  // checked
        ), intArrayOf(
           Color.RED, // unchecked color
           Color.GREEN  // checked color
        )
    )

    // finally set button tint list
    buttonTintList = colorStateList

    // optionally tint mode or tint blend
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q){
        buttonTintBlendMode = BlendMode.SRC_IN
    }else{
        buttonTintMode = PorterDuff.Mode.SRC_IN
    }

    invalidate() // could not be necessary
}

Now call it

   radioButton.setCircleColor()

done