Summary - Location

Combine expo-location, getCurrentPositionAsync and watchPositionAsync to write a location tracking app.

Summary - Location

In this group you learned to install the expo-location package, ask for location permission, get the current location with getCurrentPositionAsync, track continuously with watchPositionAsync and convert an address to a coordinate with geocodeAsync. The core of a location app is these five pieces.

In the summary we will merge permission, current location and address resolution in a single app. These three pieces together form a real location flow. Let us merge them now.

Exercise Summary - Get the current location

Complete the getLocation function. Call const loc = await Location.getCurrentPositionAsync({ accuracy: Location.Accuracy.High }). Return an object with return { latitude: loc.coords.latitude, longitude: loc.coords.longitude }.

Show example solution

const loc = await Location.getCurrentPositionAsync({
  accuracy: Location.Accuracy.High,
});
return { latitude: loc.coords.latitude, longitude: loc.coords.longitude };

Exercise Summary - Address to coordinate

Complete the geocodeAddress function. Call const results = await Location.geocodeAsync(address). Return the first result with return results[0].

Show example solution

const results = await Location.geocodeAsync(address);
return results[0];

Test yourself

Write the permission function

const permission = await Location.____();

Show answer

const permission = await Location.requestForegroundPermissionsAsync();

Match each flow part to its role

requestForegroundPermissionsAsync

Location permission
getCurrentPositionAsync

Current location
watchPositionAsync

Continuous tracking
geocodeAsync

Address to coordinate

Next lesson: react-native-maps

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