res/drawable-watch/action_positive_bg.xml

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_enabled="false">
        <shape android:shape="oval">
            <solid android:color="@color/circular_button_disabled"/>
            <size android:width="40dp" android:height="40dp" />
        </shape>
    </item>
    <item android:state_pressed="true">
        <shape android:shape="oval">
            <solid android:color="#009688"/>
            <size android:width="40dp" android:height="40dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="oval">
            <solid android:color="#00BFA5"/>
            <size android:width="40dp" android:height="40dp" />
        </shape>
    </item>
</selector>