android - eclipse: display google maps using coordinates obtained using gps

Question

I am trying to create an app that will obtain the users location via gps, display the users location in google maps, and then update after a certain amount of time/movement.

I currently have an app that will obtain the users location via gps and update itself every 10meters/10,000 miliseconds, but currently all it does is display what the coordinates are. I have it set up to connect to google maps, but at the minute it is simply setting the map to some coordinates that I have manually entered myself.

How do I get it so the map will display the location based on the coordinates obtained via gps?

Any help would be greatly appreciated, I am very new to all this!

EDIT: heres my code so far!

package com.android.basicmap;

import com.google.android.maps.MapActivity;
import android.os.Bundle;
import com.google.android.maps.MapView;
import com.google.android.maps.MapController;
import com.google.android.maps.GeoPoint;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;

public class BasicMapActivity extends MapActivity {

private MapView mapView;
private MapController mapController;

private LocationManager locationManager;
private LocationListener locationListener;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);  

    locationListener = new GPSLocationListener();

    locationManager.requestLocationUpdates(
      LocationManager.GPS_PROVIDER, 
      0, 
      0, 
      locationListener);

    mapView = (MapView) findViewById(R.id.mapView);
    mapView.setStreetView(true);
    mapView.setBuiltInZoomControls(true);

    mapController = mapView.getController();
    mapController.setZoom(16);
}

@Override
protected boolean isRouteDisplayed() {
  return false;
}

private class GPSLocationListener implements LocationListener 
{
  @Override
  public void onLocationChanged(Location location) {
    if (location != null) {
      GeoPoint point = new GeoPoint(
          (int) (location.getLatitude() * 1E6), 
          (int) (location.getLongitude() * 1E6));

      Toast.makeText(getBaseContext(), 
          "Latitude: " + location.getLatitude() + 
          " Longitude: " + location.getLongitude(), 
          Toast.LENGTH_SHORT).show();

      mapController.animateTo(point);
      mapController.setZoom(16);
      mapView.invalidate();
    }
  }


}

}

Answer 1

Here's a full-blown tutorial on that: http://www.codeproject.com/Articles/112044/GPSLocator-App-to-Find-Current-Nearest-Location-us

But come on, I found that by entering "android how to show gps location on google map", please, google more thoroughly and go through tutorials before posting such simple questions :)

Answer 2

Assuming that you are using MapView, the simplest thing to do is add an instance of MyLocationOverlay to the map, as Android will handle displaying the user's location for you.

map=(MapView)findViewById(R.id.whatever_your_mapview_id_is);
map.getOverlays().add(new MyLocationOverlay(this, map));

If for some reason you want to do that yourself rather than use the built-in facility, you can create your own ItemizedOverlay to display the point, and add an instance of your own custom overlay to the MapView.

Answer 3

It's the best to use MyLocationOverlay if you want to display user's current location. However you have alternative of:

map.animateTo(GeoPoint);

Answer 4

Assuming that u've defined your mapview and mapcontroller

for that, first you neeed suscribe to the location update in your OnCreate method like that: the code belows requests update every 1000ms or 10m

LocationManager lm;
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 10f, this);

below you is my way to update my position on the map

@Override
GeoPoint p,P2, p3;
double lat=53,  double lng=4;
    public void onLocationChanged(Location location) {
        Log.v(tag, "Location Changed");

        lat= (int) (location.getLatitude());
        lng= (int) (location.getLongitude());

        sb = new StringBuilder(512);

        noOfFixes++;

        p = new GeoPoint(
                (int) (location.getLatitude()*1E6), 
              (int) (location.getLongitude()*1E6));
        mapController.animateTo(p);
        mapController.setCenter(p);

        Toast.makeText(this, "Lat= " + lat + " Long= " + lng, Toast.LENGTH_SHORT).show();




    }