Develop Reference

some issue in detecting location application crashes

I am Trying to develop small application in which i am trying to Detect Location.
I am using the following code but i don't know why my application crashes. It show the application stops Unfortunately.
Here is the code. Please tell me if there is any bug and if not then please at least reply.
Thanks.
Here is the Code.
package com.project.kamani.nearby;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class Map extends Activity implements LocationListener{
public GoogleMap google_map;
public List<Address> addresses;
public Geocoder geocoder;
private Location location;
private double lat;
private double lang;
private Criteria criteria;
private LocationManager location_manager;
private String provider;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES=20;//DISTANCE IN METERS
private static final long MIN_TIME_BW_UPDATES=1000*60*1;// TAKES UPDATE AFTER 1 MINUTES
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(isGooglePlayAvailable())
{
criteria=new Criteria();
setContentView(R.layout.mapdemo);
getGoogleMap();
getUserLocation();
//Toast.makeText(this, "Latitude:"+lat+" Longitude:"+lang, Toast.LENGTH_LONG).show();
getAddress(lat,lang);
drawMarker(lat,lang);
}
}
private boolean isGooglePlayAvailable(){
int status=GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if(status==ConnectionResult.SUCCESS)
return true;
else
GooglePlayServicesUtil.getErrorDialog(status, this, 10).show();
return false;
}
private void getGoogleMap(){
if(google_map==null){
google_map=((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
}
}
private void drawMarker(double lattitude,double longitude){
google_map.clear();
google_map.setMyLocationEnabled(true);
LatLng latlng=new LatLng(lattitude, longitude);
google_map.moveCamera(CameraUpdateFactory.newLatLng(latlng));
google_map.animateCamera(CameraUpdateFactory.zoomTo(15));
LatLng currentPosition = new LatLng(lattitude,longitude);
google_map.addMarker(new MarkerOptions().position(currentPosition).snippet("Address:" + addresses.get(0).getAddressLine(0) + "City:"+ addresses.get(0).getAddressLine(1)+"Country:"+addresses.get(0).getAddressLine(2)).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)).title("ME"));
}
private void getAddress(double lattitude,double longitude){
geocoder=new Geocoder(Map.this, Locale.getDefault());
try {
addresses=geocoder.getFromLocation(lattitude, longitude, 1);
Toast.makeText(Map.this, "Address:" + addresses.get(0).getAddressLine(0) + "City:"+ addresses.get(0).getAddressLine(1)+"Country:"+addresses.get(0).getAddressLine(2), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
}
}
private void getUserLocation(){
location_manager=(LocationManager) getSystemService(LOCATION_SERVICE);
if(location_manager!=null){
provider=location_manager.getBestProvider(criteria, true);
location=location_manager.getLastKnownLocation(provider);
location_manager.requestLocationUpdates(provider, Map.MIN_TIME_BW_UPDATES, Map.MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
lat=location.getLatitude();
lang=location.getLongitude();
}
}
#Override
public void onLocationChanged(Location location) {
google_map.clear();
drawMarker(lat, lang);
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
Here is the snapshot that error i am getting in logcat.
I hope it will be helpful to solve error.
EDIT:-
If you don't want to monitor once again full code just try to view at getUserLocation method still the application stops working when i enable the GPS thanks for your support.

location is never initialized. Your are setting location as the variable that will hold the return value of getUserLocation() and it is also its parameter; both are null.

public class MainActivity extends MapActivity implements LocationListener {
private MapView mapView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting reference to MapView
mapView = (MapView) findViewById(R.id.map_view);
// Setting Zoom Controls on MapView
mapView.setBuiltInZoomControls(true);
// Getting LocationManager object from System Service LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location
Location location = locationManager.getLastKnownLocation(provider);
if(location!=null){
onLocationChanged(location);
}
locationManager.requestLocationUpdates(provider, 20000, 0, this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
#Override
public void onLocationChanged(Location location) {
TextView tvLocation = (TextView) findViewById(R.id.tv_location);
// Getting latitude
double latitude = location.getLatitude();
// Getting longitude
double longitude = location.getLongitude();
// Setting latitude and longitude in the TextView tv_location
tvLocation.setText("Latitude:" + latitude + ", Longitude:"+ longitude );
// Creating an instance of GeoPoint corresponding to latitude and longitude
GeoPoint point = new GeoPoint((int)(latitude * 1E6), (int)(longitude*1E6));
// Getting MapController
MapController mapController = mapView.getController();
// Locating the Geographical point in the Map
mapController.animateTo(point);
// Applying a zoom
mapController.setZoom(15);
// Redraw the map
mapView.invalidate();
// Getting list of overlays available in the map
List<Overlay> mapOverlays = mapView.getOverlays();
// Creating a drawable object to represent the image of mark in the map
Drawable drawable = this.getResources().getDrawable(R.drawable.cur_position);
// Creating an instance of ItemizedOverlay to mark the current location in the map
CurrentLocationOverlay currentLocationOverlay = new CurrentLocationOverlay(drawable);
// Creating an item to represent a mark in the overlay
OverlayItem currentLocation = new OverlayItem(point, "Current Location", "Latitude : " + latitude + ", Longitude:" + longitude);
// Adding the mark to the overlay
currentLocationOverlay.addOverlay(currentLocation);
// Clear Existing overlays in the map
mapOverlays.clear();
// Adding new overlay to map overlay
mapOverlays.add(currentLocationOverlay);
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
Download Here

Cant get a location on Android smartphone

I am trying to get a location (latitude, longitude) on my Android smartphone (HTC Desire HD), using Wifi-network and GPS.
This is the code I use, only I keep getting "Location not available"
Iam working with Eclipse IDE.
import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import com.example.shortsproject.R;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class LocationGetter extends Activity implements LocationListener {
private TextView latituteField;
private TextView longitudeField;
private LocationManager locationManager;
private String provider;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location);
latituteField = (TextView) findViewById(R.id.locationtext);
longitudeField = (TextView) findViewById(R.id.locationtext2);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the location provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
} else {
latituteField.setText("Location not available");
longitudeField.setText("Location not available");
}
}
/* Request updates at startup */
#Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
/* Remove the locationlistener updates when Activity is paused */
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
#Override
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider) {
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
}
Can someone help me with this?

geolocalisation with android

i am trying to make my emulator indicate where i am on the map , the problem is i don't get my real location nor the compass
i am only using the emulator on the computer
i integered the google map,the key, the imports inthe manifest.xml
here is the code :
package com.training.surveyproject;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.Toast;
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.MyLocationOverlay;
public class SurveyActivity extends MapActivity implements LocationListener
{
private MapView mapView = null;
private LocationManager lm = null;
private double lat = 0;
private double lng = 0;
private MapController mc = null;
private MyLocationOverlay myLocation = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_survey);
mapView = (MapView) this.findViewById(R.id.mapView);
mapView.setBuiltInZoomControls(true);
lm = (LocationManager) this.getSystemService(LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 0, this);
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 10000, 0, this);
mc = mapView.getController();
mc.setZoom(12);
myLocation = new MyLocationOverlay(getApplicationContext(),mapView);
myLocation.runOnFirstFix(new Runnable(){
public void run(){
mc.animateTo(myLocation.getMyLocation());
mc.setZoom(17);
}
});
mapView.getOverlays().add(myLocation);
myLocation.enableMyLocation();
myLocation.enableCompass();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_S)
{
mapView.setSatellite(!mapView.isSatellite());
return true;
}
return super.onKeyDown(keyCode, event);
}
#Override
public void onLocationChanged(Location location)
{
lat = location.getLatitude();
lng = location.getLongitude();
Toast.makeText(getBaseContext(),
"Location change to : Latitude = " + lat + " Longitude = " + lng,
Toast.LENGTH_SHORT).show();
GeoPoint p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
mc.animateTo(p);
mc.setCenter(p);
}
#Override
protected boolean isRouteDisplayed()
{
return false;
}
#Override
public void onProviderDisabled(String provider)
{
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider)
{
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
// TODO Auto-generated method stub
}
}
thank u

You can send simulated GPS fixes to an emulator by opening the DDMS perspective and the 'emulator control' tab in there. That tab has a 'location control' option which will send the lat/long to the emulator.

android app to send current location co-ordintes to database

I need a simple android app which can be installed on any android supporting device; I need this app to send the coordinates of its current location every 5 minutes so that it can be sent to sql database
Thanks
This is the code from which i am showing my current location and getting the co-ordinates values(as toast message for now)
Now i need to send this location co-ordinate to the database after every 5 minutes
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.iconnectgroup.LocateDeviceApp.Gps.MyPositionOverlay;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class HelloGoogleMaps extends MapActivity {
MapController mapController;
MyLocationOverlay myLocationOverlay ;
MyPositionOverlay positionOverlay;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mapController = mapView.getController();
mapController.setZoom(17);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
mapView.setStreetView(true);
myLocationOverlay = new MyLocationOverlay(this, mapView);
mapView.getOverlays().add(myLocationOverlay);
myLocationOverlay.runOnFirstFix(new Runnable() {
public void run() {
mapView.getController().animateTo(
myLocationOverlay.getMyLocation());
}
});
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
}
public class MyLocationListener implements LocationListener
{
#Override
public void onLocationChanged(Location loc)
{
loc.getLatitude();
loc.getLongitude();
String Text = "Truck location is: " +
"Latitude = " + loc.getLatitude() +
"Longitude = " + loc.getLongitude();
Toast.makeText( getApplicationContext(), Text, Toast.LENGTH_LONG).show();
Log.e("co-ordinates are:", Text);
}
#Override
public void onProviderDisabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Disabled", Toast.LENGTH_LONG ).show();
}
#Override
public void onProviderEnabled(String provider)
{
Toast.makeText( getApplicationContext(), "Gps Enabled", Toast.LENGTH_LONG).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras)
{
}
}
#Override
protected void onResume() {
super.onResume();
myLocationOverlay.enableCompass();
myLocationOverlay.enableMyLocation();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
myLocationOverlay.disableCompass();
myLocationOverlay.disableMyLocation();
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}

latitude and longitude change in android and map not shown

latitude and longitude change in android and map not shown
package net.learn2develop.GoogleMaps;
import java.io.IOException;
import java.util.*;
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.MapView.LayoutParams;
import android.app.LocalActivityManager;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Point;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;
public class MapsActivity extends MapActivity {
MapView mapView;
MapController mc;
GeoPoint p;
double latPoint, lngPoint;
LocationManager myManager;
class MapOverlay extends com.google.android.maps.Overlay
{
#Override
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
//---when user lifts his finger---
if (event.getAction() == 1) {
GeoPoint p = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
Geocoder geoCoder = new Geocoder(
getBaseContext(), Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(
p.getLatitudeE6() / 1E6,
p.getLongitudeE6() / 1E6, 1);
String add = "";
if (addresses.size() > 0)
{
for (int i=0; i<addresses.get(0).getMaxAddressLineIndex();
i++)
add += addresses.get(0).getAddressLine(i) + "\n";
}
Log.e("address", add);
Toast.makeText(getBaseContext(), add, Toast.LENGTH_SHORT).show();
}
catch (IOException e) {
e.printStackTrace();
}
return true;
}
else
return false;
}
}
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.mapView);
LinearLayout zoomLayout = (LinearLayout) findViewById(R.id.zoom);
View zoomView = mapView.getZoomControls();
zoomLayout.addView(zoomView, new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mapView.displayZoomControls(true);
mc = mapView.getController();
LocationManager myManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
myManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,new myLocationListener());
mc.setZoom(10);
//---Add a location marker---
MapOverlay mapOverlay = new MapOverlay();
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
mapView.invalidate();
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
class myLocationListener implements LocationListener {
public void ListLocationUpdater() {
}
#Override
public void onLocationChanged(Location loc) {
if (myManager != null) {
// List list = myManager.getAllProviders();
String param = (String) myManager.getProviders(true).get(0);
loc = myManager.getLastKnownLocation(param);
if (loc != null) {
latPoint = loc.getLatitude();
lngPoint = loc.getLongitude();
p = new GeoPoint((int) (latPoint * 1E6), (int) (lngPoint * 1E6));
mc.animateTo(p); Log.e("RootDrawApplication",String.valueOf(latPoint)+" , "+String.valueOf(lngPoint));
} else
Log.e("GoogleMaps ", "Error: Location is null");
} else
Log.e("GoogleMaps ", "Error: Location Manager is null");
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
}

Create a backgroud thread and check the gps data there.
And use a LocationListener:
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location l) {
TextView tv = new TextView(gpstracker.this);
tv.setText("lat: " + l.getLatitude() + "\nlon: " + l.getLongitude());
setContentView(tv);
}
...
This can also help...

Add a location listener to your location manager with this code:
myManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
0, new myLocationListener());
This way, your myLocationListener will implement the locationListener interface and change Location in onLocationChangedFunction.
public class myLocationListener implements LocationListener {
public ListLocationUpdater() {
}
#Override
public void onLocationChanged(Location location) {
//assign location here
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}