Implementing TaskManager with react-navigation 5

Expo SDK
1

Hey all!

  1. SDK Version: 37
  2. Platforms(Android/iOS/web/all): all

I am using react navigatoin 5, so the main App is now a function and not a class. Due to this reason I am facing an issue of implementing expo’s TaskManager and BackgroundLocation.

Here is some of the code:

const LOCATION_TASK_NAME = 'background-location-task';

TaskManager.defineTask(LOCATION_TASK_NAME, ({ data, error }) => {
  if (error) {
    console.log(error);
    return;
  }
  if (data) {
    const { locations } = data;
    // do something with the locations captured in the background
    console.log('this is finally working');
  }
});

async function locFunction() {
  const { status } = await Location.requestPermissionsAsync();
  if (status === 'granted') {
    console.log('Background location is on');
    await Location.startLocationUpdatesAsync(LOCATION_TASK_NAME, {
        accuracy: Location.Accuracy.Highest,
        timeInterval: 5000
  });
  }
}

export default function App() {

 locFunction();

  return (
    <NavigationContainer>
            <StackNavigator />
    </NavigationContainer>
  );

}

It throws the error: “TaskManager.defineTask must be called during initialization phase!”, but I don’t know where to does the initilization phase is in this situation… Should I call the function from another class? Also, I can’t make App() async, tried it already…

In general, I want the app to check the location of the user every once in a while when the app is in the background, and then use geoQuery (of geolocation) and maybe send notifications…

Thanks for your help!

2

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