custom TextView that can change background color

I have a written a custom TextView in kotlin, which acts as a selection button. Meaning, in unselected states it has a grey-ish background with corners, and in selected state it this background changes color.

(In the middle of the button there's a text)

The problem : I need to display a whole group of these buttons, and for each button, the color of selected state can vary and change from button to button.

So if I have : Button1, Button2, Button3, for each of them, when they're selected, the background color is different.

Can I somehow control the color that the drawable xml uses?

button_background :

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:padding="10dp"
    android:shape="rectangle" >
    <solid android:color="@color/dynamicColor" /> --> how can I control this color?

    <corners
        android:bottomLeftRadius="20dp"
        android:bottomRightRadius="20dp"
        android:topLeftRadius="20dp"
        android:topRightRadius="20dp" />
</shape>