Unable to update my current position on google maps android v1 only the 1st position is showed throughout - gps

Question

I am unable to update my current position on google map api v1 in android. Only the first position when the app starts is shown throughout. Here's my code I have taken help from androidhive.
There are three classes AddItemizedOverlay,GPSTracker and AndroidGoogleMapsActivity.
AddItemizedOverlay.java(This for the Overlay)
package com.androidhive.googlemaps;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.Toast;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
public class AddItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>();
private Context context;
public AddItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public AddItemizedOverlay(Drawable defaultMarker, Context context) {
this(defaultMarker);
this.context = context;
}
#Override
protected OverlayItem createItem(int i) {
return mapOverlays.get(i);
}
#Override
public int size() {
return mapOverlays.size();
}
#Override
protected boolean onTap(int index) {
Log.e("Tap", "Tap Performed");
return true;
}
public void addOverlay(OverlayItem overlay) {
mapOverlays.add(overlay);
this.populate();
}
/**
* Getting Latitude and Longitude on Touch event
* **/
/*#Override
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
if (event.getAction() == 1) {
GeoPoint geopoint = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
// latitude
double lat = geopoint.getLatitudeE6() / 1E6;
// longitude
double lon = geopoint.getLongitudeE6() / 1E6;
Toast.makeText(context, "Lat: " + lat + ", Lon: "+lon, Toast.LENGTH_SHORT).show();
}
return false;
}*/
}
GPSTracker.java(This is to get the present latitude and logitude)
package com.androidhive.googlemaps;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
double speed;
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 1 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 10000 * 1; // 10 second
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/wifi enabled
* #return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
#Override
public void onLocationChanged(Location location) {
double speed=location.getSpeed();
}
public double getspd() {
double speed=location.getSpeed();
return speed;
}
#Override
public void onProviderDisabled(String provider) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}}
AndroidGoogleMapsActivity.java(This is the class where I am rendering the map and calling the other two classes to get the position and overlay)
package com.androidhive.googlemaps;
import java.util.List;
import java.lang.Object.*;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Handler;
import android.os.Vibrator;
import android.location.Location;
import com.androidhive.googlemaps.GPSTracker;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
public class AndroidGoogleMapsActivity extends MapActivity {
GPSTracker gps;
double[] arr={24.0,0.0,24.0,50.0,24.431259282,77.155662247,24.4312773869,77.1559354131,24.4315907861,77.1560663384,24.432969441,77.1559033105,24.4345594036,77.1613486118,24.4345983795,77.1630234831,24.4349034806,77.1616558084,24.4351733778,77.1634901034,24.4356508108,77.158808477,24.4359046986,77.1588943077,24.436061943,77.1628120915,24.6377519985,77.3526723525,24.6406972305,77.3023587404,24.640731261,77.3146044449,24.640830838,77.3044040917,24.6408552293,77.3057836686,24.6559378717,77.4399105809,24.656802297,77.4460797431,26.5433058012,77.9836704178,28.4118864562,77.3072094298};
double lat=0.0;
double lon=0.0;
MapView mapView;
GeoPoint geoPoint;
double min=0.0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Context context=this;
// Displaying Zooming controls
mapView = (MapView) findViewById(R.id.mapView);
mapView.setBuiltInZoomControls(true);
//TextView latituteField = (TextView) findViewById(R.id.latituteField);
//TextView longitudeField = (TextView) findViewById(R.id.longitudeField);
gps = new GPSTracker(AndroidGoogleMapsActivity.this);
// check if GPS enabled
if(gps.canGetLocation()){
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
lat=latitude;
lon=longitude;
}else{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
/**
* Changing Map Type
* */
// mapView.setSatellite(true); // Satellite View
// mapView.setStreetView(true); // Street View
// mapView.setTraffic(true); // Traffic view
/**
* showing location by Latitude and Longitude
* */
MapController mc = mapView.getController();
//double lat = Double.parseDouble("24.435702");
//double lon = Double.parseDouble("77.160931");
geoPoint = new GeoPoint((int)(lat * 1E6), (int)(lon * 1E6));
mc.animateTo(geoPoint);
mc.setZoom(20);
/**
* Placing Marker
* */
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.yellow);
AddItemizedOverlay itemizedOverlay =
new AddItemizedOverlay(drawable, this);
OverlayItem overlayitem = new OverlayItem(geoPoint, "Hello", "Sample Overlay item");
itemizedOverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedOverlay);
mapView.invalidate();
//List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable1 = this.getResources().getDrawable(R.drawable.mark_red);
AddItemizedOverlay itemizedOverlay1 =
new AddItemizedOverlay(drawable1, this);
for(int i=0;i<21;i++)
{
GeoPoint geoPoint1 = new GeoPoint((int)(arr[2*i] * 1E6), (int)(arr[(2*i)+1] * 1E6));
//Location.distanceBetween(lat, lon, arr[2*i], arr[(2*i)+1], results);
Location locationA = new Location("point A");
locationA.setLatitude(lat);
locationA.setLongitude(lon);
Location locationB = new Location("point B");
locationB.setLatitude(arr[2*i]);
locationB.setLongitude(arr[(2*i)+1]);
double distance = locationA.distanceTo(locationB);
if(i==0)
min=distance;
else if(distance<min)
min=distance;
//Toast.makeText(context,"Result " + distance + ", Result"+arr[(2*i)+1], Toast.LENGTH_SHORT).show();
OverlayItem overlayitem1 = new OverlayItem(geoPoint1, "Pothole", "It's a pothole");
itemizedOverlay1.addOverlay(overlayitem1);
mapOverlays.add(itemizedOverlay1);
}
Location location = new Location("point present");
double speed=-1.0;
if(location.hasSpeed())
{
speed = (location.getSpeed());
}
else
{
Toast.makeText(context,"No speed boss", Toast.LENGTH_SHORT).show();
}
//double speed=location.getSpeed();
Toast.makeText(context,"Lat: " + lat + ", Lon: "+lon + "Min distance"+min+" Speed="+speed, Toast.LENGTH_SHORT).show();
mapView.postInvalidate();
Vibrator v = (Vibrator) getSystemService(context.VIBRATOR_SERVICE);
double slimit=27.7778;
double hlimit=166.6665;
if(min>slimit&&min<hlimit)
{
Toast.makeText(context,"Pothole " + min + " meters ahead.", Toast.LENGTH_SHORT).show();
v.vibrate(3000);
}
/*for(int j=0;j<1000000;j++)
{
if((j%50000)==0)
{
GPSTracker gps1=new GPSTracker(AndroidGoogleMapsActivity.this);;
lat=gps1.getLatitude();
lon=gps1.getLongitude();
geoPoint = new GeoPoint((int)(lat * 1E6), (int)(lon * 1E6));
mapView.invalidate();
mapView.postInvalidate();
//mapView.getController().scrollBy(1, 1);
//mapView.getController().scrollBy(-1, -1);
Toast.makeText(context,"Lat: " + lat + ", Lon: "+lon+" ,j=:"+j, Toast.LENGTH_SHORT).show();
}
}*/
}
#Override
protected boolean isRouteDisplayed() {
return false;
}
}
AndroidGoogleMapsActivity.java shows only the location that was when the app was open it does not shows the updated location after every 1 second(minimum update time). Please help it's part of my final year project. Thanks in advance.

Answer 1

you get location updates in onLocationChanged, In your code you are catching only speed.
public void onLocationChanged(Location location) {
double speed=location.getSpeed();
// update code for getting location (la & ln )
}