17. Exercise: findViewById

Now it’s your turn to complete this exercise yourself.

In this exercise, you will use findViewById to get a reference to the button.

1. Set button’s id in the activity_main.xml layout file:

android:id="@+id/roll_button"

2. Use findViewById to get a reference to the button and assign it to an immutable variable called rollButton:

val rollButton: Button = findViewById(R.id.roll_button)

3. (Optional) Dynamically modify the Button view:

Set the button text to "Roll Button"

rollButton.text = "Let's Roll"