public class MapsActivity extends Activity implements LocationListener, InfoWindowAdapter, OnMarkerClickListener, OnMarkerDragListener{
}

@Override
public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.map);........if(servicesConnected()){initMapView();}
}

private boolean servicesConnected() {// Check that Google Play services is availableint resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);// If Google Play services is availableif(ConnectionResult.SUCCESS == resultCode) {log("Google Play services is available.");isServiceOk = true;} else {// Get the error codeConnectionResult connectionResult = new ConnectionResult(resultCode, null);int errorCode = connectionResult.getErrorCode();// Get the error dialog from Google Play servicesDialog errorDialog = GooglePlayServicesUtil.getErrorDialog(errorCode,this,RESULT_CODE_SERVICE_FAILURE);// If Google Play services can provide an error dialogif(errorDialog != null) {errorDialog.show();}isServiceOk = false;}return isServiceOk;
}

1 private void initMapView(){
2     mMapView = ((MapFragment)getFragmentManager().findFragmentById(R.id.map_view)).getMap();
3     mMapView.setMapType(GoogleMap.MAP_TYPE_NORMAL);
4
5     UiSettings setting = mMapView.getUiSettings();
6     setting.setTiltGesturesEnabled(true);
7     //setting.setCompassEnabled(false);
8 }
9     

mLocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mGPSOk = mLocManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

 1 @Override
 2 protected void onResume(){
 3     super.onResume();
 4     if(isServiceOk == false)
 5         return;
 6
 7     String provider = getBestProvider();
 8     if(provider != null){
 9        mLocManager.requestLocationUpdates(provider, 5*1000, 1, this);
10     }
11
12     updateCurrentLoction();
13     setLatLng();
14 }

 1 /* LocationListener begin */
 2 @Override
 3 public void onLocationChanged(Location newLoction) {
 4     if(mLocation != null){
 5         mLocation.setLatitude(newLoction.getLatitude());
 6         mLocation.setLongitude(newLoction.getLongitude());
 7         animateLatLng();
 8     }
 9 }
10
11 @Override
12 public void onProviderDisabled(String arg0) {
13     // TODO Auto-generated method stub
14 }
15 @Override
16 public void onProviderEnabled(String arg0) {
17     // TODO Auto-generated method stub
18 }
19 @Override
20 public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
21 }
22 /* LocationListener end */

 1  2 private void updateCurrentLoction(){
 3     String bestProvider = getBestProvider();
 4     Location  newLoction = null;
 5
 6     if(bestProvider != null)
 7         newLoction = mLocManager.getLastKnownLocation(bestProvider);
 8
 9     if(mLocation == null){
10         mLocation = new Location("");
11     }
12
13     if(newLoction != null){
14         mLocation.setLatitude(newLoction.getLatitude());
15         mLocation.setLongitude(newLoction.getLongitude());
16     }
17 }

 1 private void setLatLng(boolean marked){
 2     if(mLocation == null){
 3         Toast.makeText(this, R.string.gpserr, Toast.LENGTH_LONG).show();
 4         return;
 5     }
 6
 7     double dLat = mLocation.getLatitude();
 8     double dLong = mLocation.getLongitude();
 9     log("setLatLng: (" + dLat + "," + dLong + ")");
10
11     //LatLng latlng = new LatLng(31.13893, 121.39668);
12     LatLng latlng = new LatLng(dLat, dLong);
13     if((latlng.latitude == 0) && (latlng.longitude == 0)){
14         //mMapView.moveCamera(CameraUpdateFactory.newLatLng(latlng));
15     }else{
16         mMapView.moveCamera(CameraUpdateFactory.newLatLngZoom(latlng, 15));
17     }
18 }
19
20 private void animateLatLng(boolean guide){
21     if(mLocation == null){
22         Toast.makeText(this, R.string.gpserr, Toast.LENGTH_LONG).show();
23         return;
24     }
25
26     double dLat = mLocation.getLatitude();
27     double dLong = mLocation.getLongitude();
28     log("animateLatLng: (" + dLat + "," + dLong + ")");
29     LatLng latlng = new LatLng(dLat, dLong);
30
31     mMapView.animateCamera(CameraUpdateFactory.newLatLng(latlng));
32 }