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Not able to display path from current location to destination google maps V2

I am trying to draw path from current location to destination using the answer Android: How to draw route directions google maps API V2 from current location to destination.
But in place of the hard coded I longitude and Latitude of the current location I want to use my real location. But whenever I try to do that, the App is crashing with error in line location = mMap.getMyLocation();
Any help is appreciated.
MapsActivity.Java
public class MapsActivity extends FragmentActivity {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
Location location;
LatLng myPosition;
GMapV2Direction md;
LatLng fromPosition = getYourLocation();
LatLng toPosition = new LatLng(13.683660045847258, 100.53900808095932);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
md = new GMapV2Direction();
setUpMapIfNeeded();
LatLng coordinates = new LatLng(13.685400079263206, 100.537133384495975);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 16));
mMap.addMarker(new MarkerOptions().position(fromPosition).title("Start"));
mMap.addMarker(new MarkerOptions().position(toPosition).title("End"));
Document doc = md.getDocument(fromPosition, toPosition, GMapV2Direction.MODE_DRIVING);
int duration = md.getDurationValue(doc);
String distance = md.getDistanceText(doc);
String start_address = md.getStartAddress(doc);
String copy_right = md.getCopyRights(doc);
ArrayList<LatLng> directionPoint = md.getDirection(doc);
PolylineOptions rectLine = new PolylineOptions().width(3).color(Color.RED);
for(int i = 0 ; i < directionPoint.size() ; i++) {
rectLine.add(directionPoint.get(i));
}
mMap.addPolyline(rectLine);
}
#Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
/**
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* <p/>
* If it isn't installed {#link SupportMapFragment} (and
* {#link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to
* install/update the Google Play services APK on their device.
* <p/>
* A user can return to this FragmentActivity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the FragmentActivity may not
* have been completely destroyed during this process (it is likely that it would only be
* stopped or paused), {#link #onCreate(Bundle)} may not be called again so we should call this
* method in {#link #onResume()} to guarantee that it will be called.
*/
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
/*myPosition = getLocation();
ZoomCurrentLocation(myPosition);*/
}
}
}
private LatLng getYourLocation() {
mMap.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
double latitude = 0;
double longitude = 0;
if (location != null) {
// Getting latitude of the current location
latitude = location.getLatitude();
// Getting longitude of the current location
longitude = location.getLongitude();
// Creating a LatLng object for the current location
}
LatLng latLng = new LatLng(latitude, longitude);
return latLng;
}
private void ZoomCurrentLocation(LatLng myPosition)
{
mMap.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(myPosition, 16));
}
private void setUpMap(LatLng myPosition) {
mMap.addMarker(new MarkerOptions().position(myPosition).title("Marker"));
}
}

Do you mean location = mMap.getMyLocation(); is the method getYourLocation() in the code, and the crash is at Location location = locationManager.getLastKnownLocation(provider); ?
If so, it may cause by NullPointer Exception, you need use new api FusedLocationApi to avoid getLastLocation null pointer.
Please check here to know how to use it. And here is the code for it on my github.
For the destination you can check here to get some idea.

Android Location is Null While Enabled

I am getting a null location when setting the longitutde and lattitude. I am not sure what I am doing wrong. I debugged this code with Location Services turned on and off. When they were on, the GPS_PROVIDER if statement would be true, and when they were off it neither of the conditions would be true and it would go to the else statement. However even when it confirmed the provider was enabled, the call to getLastKnownLocation returned null. Any ideas as to why?
private void setCoordinates(Context context) {
LocationManager lm = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
Location location = null;
if (lm.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
longitude = location.getLongitude();
latitude = location.getLatitude();
} else if (lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
location = lm
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
longitude = location.getLongitude();
latitude = location.getLatitude();
} else {
Log.e("AlarmLocation", "unable to get location");
}

get latitude and longitude in Android without show the map [duplicate]

This question already has an answer here:
android requestLocationUpdates failing
(1 answer)
Closed 2 years ago.
Is there a way to obtain information without displaying the map?
I want get my coordinate of my place during the work with other activity.
tnx a lot.

By Using LocationManager you can get lat and lang :
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
double longitude = location.getLongitude();
double latitude = location.getLatitude();
The call to getLastKnownLocation() doesn't block - which means it will return null if no position is currently available - so you probably want to have a look at passing a LocationListener to the requestLocationUpdates() method instead, which will give you asynchronous updates of your location.
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
longitude = location.getLongitude();
latitude = location.getLatitude();
}
}
lm.requestLocationUpdates(LocationManager.GPS, 2000, 10, locationListener);
You'll need to give your application the ACCESS_FINE_LOCATION permission if you want to use GPS.
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
You may also want to add the ACCESS_COARSE_LOCATION permission for when GPS isn't available and select your location provider with the getBestProvider() method.

Using this code able to get latitude and Longitude values and make
sure before using application you got permission from manifest for accessing location
if(isGPS) {
Geocoder gc = new Geocoder(getApplicationContext(), Locale.getDefault());
try
{
double lat=location.getLatitude();
double lng=location.getLongitude();
Toast.makeText(getApplicationContext(),lat+"and"+lng, Toast.LENGTH_LONG).show();
}
catch (Exception e)
{
e.printStackTrace();
}
}
else
{
display("GPS not Enabled");
}
Manifest permission
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Use this if you want to get lat lon without internet
LocationManager lm = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
latitude = location.getLongitude();
longitude = location.getLatitude();

Null Pointer Exception in GeoPoint

What's wrong with the below code. It is throwing Null Pointer Exception on this line (location.setLatitude(latitude);). I am trying to make a circle as soon as the application is started so that is the reason I am passing location object from my onCreate method.
private Location location;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new GPSLocationListener();
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
0,
0,
locationListener);
mapView = (MapView) findViewById(R.id.mapView);
listView = (ListView) findViewById(R.id.mylist);
mapView.setStreetView(true);
mapView.setBuiltInZoomControls(true);
mapController = mapView.getController();
mapController.setZoom(15);
GeoPoint initialPoint = new GeoPoint( (int) (36.778261* 1E6), (int) (-119.417932 * 1E6));
double latitude = initialPoint .getLatitudeE6() / 1E6;
double longitude = initialPoint .getLongitudeE6() / 1E6;
location.setLatitude(latitude);
location.setLongitude(longitude);
locationListener.onLocationChanged(location);
}
Below is the class which take care of LocationUpdate.
private class GPSLocationListener implements LocationListener {
MapOverlay mapOverlay;
public GPSLocationListener(MapView mapView) {
}
#Override
public void onLocationChanged(Location location) {
if (location != null) {
GeoPoint point = new GeoPoint(
(int) (location.getLatitude() * 1E6),
(int) (location.getLongitude() * 1E6));
mapController.animateTo(point);
mapController.setZoom(15);
if (mapOverlay == null) {
mapOverlay = new MapOverlay(this,android.R.drawable.star_on);
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.add(mapOverlay);
}
mapOverlay.setPointToDraw(point);
mapView.invalidate();
}
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
Any suggestions will be of great help.
UPDATE:-
After making changes I am getting
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
Below is my code where I made changes.
GeoPoint initialPoint = new GeoPoint( (int) (36.778261), (int) (-119.417932));
double latitude = initialPoint .getLatitudeE6() / 1E6;
double longitude = initialPoint .getLongitudeE6() / 1E6;
this.location = new Location("TechGeeky Randomly Initialized");
location.setLatitude(latitude);
location.setLongitude(longitude);
locationListener.onLocationChanged(location);
Is there anything wrong I am doing here?

I think what you want to do this is not fetch the last known location from LocationManager but instead start with a location that you defined yourself (e.g a random one) in onCreate(). To achieve this, simply create a new Location object like so:
this.location = new Location("TechGeeky Randomly Initialized");
Do this instantiation before these lines in order to avoid the Exception:
location.setLatitude(latitude);
location.setLongitude(longitude);
locationListener.onLocationChanged(location);

Intialize Location object using this code:-
If You Want get location using Mobile Network Put this code in onCreate
Location location=null;
location=locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
If You Want get location using GPS Put this code in onCreate
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

You have instantiated location object. Where did you create object to location. Please create object to location using:
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
or
pass location object to method as argument and check null condition.

Get user current location and determine it in Google maps

i wan to ask you: i am using google Maps in my application and when i open the activity that has the map i want the user current location to be determine, i am using this code to retrieve the current user location
public void locat ()
{
//Use the LocationManager class to obtain GPS locations
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
// Class My Location Listener
public class MyLocationListener implements LocationListener
{
#Override
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = "My current location is: " + "Latitud = " + loc.getLatitude() +"Longitud = " + loc.getLongitude();
Toast.makeText( getApplicationContext(),
Text,
Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider)
{
Toast.makeText( getApplicationContext(),"Gps Disabled",Toast.LENGTH_SHORT ).show();
}
#Override
public void onProviderEnabled(String provider)
{
Toast.makeText( getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
}// End of Class MyLocationListener */
but it is just give me the latitude and longitude and that is not what i want! i want to determine the user current location in google maps!how can i do it ? do you need my code to google MAps? Please please help me! THANK YOU

If I understand your question correctly you want to get the users current position and show it on a map. You have the latitude and longitude values, all you need to do is construct a GeoPoint and animate to that position on the map. You can also add a custom overlay to the map if desired. Something like the following should help.
double lat = location.getLatitude();
double longi = location.getLongitude();
long time = location.getTime();
GeoPoint currentGeo = new GeoPoint(toMicroDegrees(lat), toMicroDegrees(longi));
MapController controller = map.getController();
controller.animateTo(currentGeo);

You are never actually passing the information to a map in order to display the location.
What you need to do is get the MapView from the layout you displaying.
Then get the controller of the map view and set the users location as the centre/animate to their location.
Something similar to this:
mapView1 = (MapView) this.findViewById(R.id.map);
MapController mapControl = mapView1.getController();
GeoPoint geo = new GeoPoint((int)(lat)*1e6), (int(long*1e6));
mapControl.animateTo(geo);
This link should help http://mobiforge.com/developing/story/using-google-maps-android

You can open google maps with a geo uri like so:
String url = "geo:48.200927,16.369548,192";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
Edit: It appears that you want reverse geocoding. Here is an example:
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
List<Address> addresses = geocoder.getFromLocation(lat, lng, 1);
Here is the documentation for the android Geocoder class - http://developer.android.com/reference/android/location/Geocoder.html