You will need to do several things.
Firstly, to incorporate Google Maps, your complete reference is available here.
In simple steps:
1 Follow the steps here: this will help add a simple google maps to your screen.
2 To be able to get your own location you will need to use the LocationListener and LocationManager in android. To do this, first implement the LocationListener in your activity.
public class LocationActivity extends Activity implements LocationListener
3 Then you need to instantiate a few settings in your onCreate() method
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the provider
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
}
}
4 You need to be able to request for regular location updates. Include this in your onResume() method.
@Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
5 If the app falls into the pause cycle, these updates shouldn't need to come.
@Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
6 Your location listener implementation from step 2 requires that you have an onLocationChanged listener, implement it:
@Override
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
}
7 Add these two methods to be notified of the provider of your location setting - the GPS or the Network.
public void onProviderDisabled(String arg0) {
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
public void onProviderEnabled(String arg0) {
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
8 Now we need to link this up to your google maps. I will show you one example of using the google maps API to be able to generate a market to show your current location. The other usages can be inferred from the API.
First create private fields in your code:
private GoogleMap mMap;
Marker m;
9 Add these in your onCreate method - this instantiates your default marker position as 0,0 latitude and longitude.
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
m = mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0))
.title("Position"));
10 In your onLocationChanged method, we need to refresh this marker as location changes. So add:
m.setPosition(new LatLng(lat, lng));
m.setTitle("Your Position");
// Move the camera instantly to marker with a zoom
// of 15.
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), 15));
This will be a simple way of updating the marker with your position, and should be a good intro to your Google Maps and location API in android.
