(In Kotlin) If you are going to put the answer into a TextView or something you can instead use a string resource:
<string name="time">%02d:%02d</string>
And then you can use this String resource to then set the text at run time using:
private fun setTime(time: Int) {
val hour = time / 60
val min = time % 60
main_time.text = getString(R.string.time, hour, min)
}