Marquer la localisation sur google map

Tout d'abord, pour obtenir la position actuelle:

private Location mCurrentLocation;
mCurrentLocation = mLocationClient.getLastLocation();

Lire ici pour en savoir plus.

Et puis vous pouvez pointer vers l'emplacement à l'aide de:

LatLng myLaLn = new LatLng(mCurrentLocation.getLatitude(), mCurrentLocation.getLongitude());
CameraPosition camPos = new CameraPosition.Builder().target(myLaLn)
.zoom(15)
.bearing(45)
.tilt(70)
.build();
CameraUpdate camUpd3 = CameraUpdateFactory.newCameraPosition(camPos);
map.animateCamera(camUpd3);

Je vous donne un simple mais complet exemple de montrer une carte et l'emplacement actuel:

(Projet complet disponible en github.com/josuadas/LocationDemo )

public class MainActivity extends FragmentActivity implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener {
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
private LocationClient mLocationClient;
private Location mCurrentLocation;
private GoogleMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
setUpLocationClientIfNeeded();
mLocationClient.connect();
}
private void setUpMapIfNeeded() {
//Do a null check to confirm that we have not already instantiated the
//map.
if (map == null) {
//Try to obtain the map from the SupportMapFragment.
map = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
//Check if we were successful in obtaining the map.
if (map == null) {
Toast.makeText(this, "Google maps not available",
Toast.LENGTH_LONG).show();
}
}
}
private void setUpLocationClientIfNeeded() {
if (mLocationClient == null) {
Toast.makeText(getApplicationContext(), "Waiting for location",
Toast.LENGTH_SHORT).show();
mLocationClient = new LocationClient(getApplicationContext(), this, //ConnectionCallbacks
this); //OnConnectionFailedListener
}
}
@Override
public void onPause() {
super.onPause();
if (mLocationClient != null) {
mLocationClient.disconnect();
}
}
/*
* Called by Location Services when the request to connect the client
* finishes successfully. At this point, you can request the current
* location or start periodic updates
*/
@Override
public void onConnected(Bundle dataBundle) {
mCurrentLocation = mLocationClient.getLastLocation();
if (mCurrentLocation != null) {
Toast.makeText(getApplicationContext(), "Found!",
Toast.LENGTH_SHORT).show();
centerInLoc();
}
}
private void centerInLoc() {
LatLng myLaLn = new LatLng(mCurrentLocation.getLatitude(),
mCurrentLocation.getLongitude());
CameraPosition camPos = new CameraPosition.Builder().target(myLaLn)
.zoom(15).bearing(45).tilt(70).build();
CameraUpdate camUpd3 = CameraUpdateFactory.newCameraPosition(camPos);
map.animateCamera(camUpd3);
MarkerOptions markerOpts = new MarkerOptions().position(myLaLn).title(
"my Location");
map.addMarker(markerOpts);
}
/*
* Called by Location Services if the connection to the location client
* drops because of an error.
*/
@Override
public void onDisconnected() {
//Display the connection status
Toast.makeText(this, "Disconnected. Please re-connect.",
Toast.LENGTH_SHORT).show();
}
/*
* Called by Location Services if the attempt to Location Services fails.
*/
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
/*
* Google Play services can resolve some errors it detects. If the error
* has a resolution, try sending an Intent to start a Google Play
* services activity that can resolve error.
*/
if (connectionResult.hasResolution()) {
try {
//Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
/*
* Thrown if Google Play services canceled the original
* PendingIntent
*/
} catch (IntentSender.SendIntentException e) {
//Log the error
e.printStackTrace();
}
} else {
/*
* If no resolution is available
*/
Log.e("Home", Integer.toString(connectionResult.getErrorCode()));
}
}
}

Note1: j'ai omis le "Google Play Services" partie par la simplicité, mais il devrait être ajouté comme une bonne pratique.

Note2: Vous avez besoin de la google-play-services_lib projet et de référence de la vôtre.

Vous pouvez trouver toutes les informations sur l'interaction avec google maps sur android ici

mMap.setMyLocationEnabled(true);

Cette ligne affichera une icône en haut à droite de la carte, après avoir cliqué sur lequel il faut à votre emplacement actuel sur la carte.