Screen tracking for analytics

To track the currently active screen, we need to:

1. Add a callback to get notified of state changes
2. Get the root navigator state and find the active route name

To get notified of state changes, we can use the onStateChange prop on NavigationContainer. To get the root navigator state, we can use the getRootState method on the container's ref. Please note that onStateChange is not called on initial render so you have to set your initial screen separately.

Example

This example shows how the approach can be adapted to any mobile analytics SDK.

import {
  NavigationContainer,
  useNavigationContainerRef,
} from '@react-navigation/native';

export default () => {
  const navigationRef = useNavigationContainerRef();
  const routeNameRef = useRef();

  return (
    <NavigationContainer
      ref={navigationRef}
      onReady={() => {
        routeNameRef.current = navigationRef.getCurrentRoute().name;
      }}
      onStateChange={async () => {
        const previousRouteName = routeNameRef.current;
        const currentRouteName = navigationRef.getCurrentRoute().name;
        const trackScreenView = () => {
          // Your implementation of analytics goes here!
        };

        if (previousRouteName !== currentRouteName) {
          // Save the current route name for later comparison
          routeNameRef.current = currentRouteName;
          
          // Replace the line below to add the tracker from a mobile analytics SDK
          await trackScreenView(currentRouteName);
        }
      }}
    >
      {/* ... */}
    </NavigationContainer>
  );
};