AwareWhen app requires knowledge about user location and places around him you don't want to struggle with details of the underlying location technology. In this talk, you will learn how to make your life easier with the new Fused Location Provider API.

1. We design and develop great
software for mobile and web.

2. Making Your App
Location-Aware
Ivan Marić

3. Legacy
• Location API part of android SDK
• Improvements with every new version
• Switching between location providers
• Battery consumption

4. How to improve
• Power usage
• Accuracy
• Coverage
• Simple API

5. Fused Location Provider
• Single programmable interface
• WiFi, GPS, cellular, sensor data
• Power-efficiency
• HIGH_ACCURACY, BALANCED_POWER, NO_POWER
• Google play services

6. How to do it?

7. • Add play services
dependencies {
compile
}
• Specify permissions
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
'com.google.android.gms:play-services-location:7.3.0'
Include in project
'com.google.android.gms:play-services:7.3.0'

8. Google API Client
• Connection to play services
googleApiClient = new GoogleApiClient.Builder(context)
.addConnectionCallbacks(playServicesConnectionCallback)
.addOnConnectionFailedListener(playServicesFailListener)
.addApi(LocationServices.API)
.build();
• Important
Because it is hard to anticipate the state of each device, you must always check
for a compatible Google Play services APK before you access Google Play
services features.

9. Connect to API
@Override
protected void onStart() {
super.onStart();
if (!resolvingError) {
googleApiClient.connect();
}
}
@Override
protected void onStop() {
googleApiClient.disconnect();
super.onStop();
}

10. private GoogleApiClient.OnConnectionFailedListener playServicesFailListener =
new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(ConnectionResult result) {
if (resolvingError) {
return;
} else if (result.hasResolution()) {
try {
resolvingError = true;
result.startResolutionForResult(MainActivity.this, REQUEST_RESOLVE_ERROR);
} catch (IntentSender.SendIntentException e) {
googleApiClient.connect();
}
} else {
Dialog errorDialog = GooglePlayServicesUtil
.getErrorDialog(result.getErrorCode(), MainActivity.this, REQUEST_RESOLVE_ERROR);
errorDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
resolvingError = false;
}
});
errorDialog.show();
resolvingError = true;
}
}
};
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_RESOLVE_ERROR) {
resolvingError = false;
if (resultCode == RESULT_OK) {
if (!googleApiClient.isConnecting() && !googleApiClient.isConnected()) {
googleApiClient.connect();
}
}
}
}

11. Get location
• On client connected
private GoogleApiClient.ConnectionCallbacks playServicesConnectionCallback
= new GoogleApiClient.ConnectionCallbacks() {
@Override
public void onConnected(Bundle bundle) {
lastLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if (lastLocation != null) {
lastLocationLabel.setText("Last known location: " +
lastLocation.getLatitude() + ", "
+ lastLocation.getLongitude());
}
}
@Override
public void onConnectionSuspended(int i) {
// The connection has been interrupted.
// Disable any UI components that depend on Google APIs
// until onConnected() is called.
}
};

12. Location update
• Request
locationRequest = new LocationRequest();
locationRequest.setInterval(5000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
• LocationListener
@Override
public void onLocationChanged(Location location) {
if (location != null) {
// Make changes
}
}
• Start & stop updates
LocationServices.FusedLocationApi
.requestLocationUpdates(googleApiClient, locationRequest, listener);
LocationServices.FusedLocationApi.removeLocationUpdates(googleApiClient, listener);

13. https://github.com/mariciv/Location-Aware-App

14. More cool stuff

15. Google play service location
• Fused location provider
• Places API
• Geofencing APIs
• Activity recognition

16. Places API
• Place picker
• Points of interest
• Autocomplete search
• Rich information about places

17. Geofencing
• Geographic boundaries around location
• Multiple geofences
• Enter and exit alert
• Battery efficiency

18. Activity recognition
• User current activity
• Walking, cycling, driving …
• Movement awareness
• Activity detection apps

19. References
https://developer.android.com/google/play-services/location.html
https://developer.android.com/google/auth/api-client.html
https://developer.android.com/training/location/index.html
https://github.com/mariciv/Location-Aware-App