Develop Reference

null pointer exception on location change

I researched for this Nullpointer Exception. After googling i found most of them were due to null references to the UI elements. But mine does not have any. I just can't get the reason for the null pointer. I directly tested it on my android phone running 2.3.7. And yes, i added the permissions in the manifest file.
package com.GodTM.projectshoppers;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
public class HomeActivity extends Activity {
private ImageButton get;
private ImageView quit,settings;
private LocationManager locMan;
public LocationListener LocLis;
public Location currLoc;
private double[] passloc;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
get=(ImageButton)findViewById(R.id.homeGetButton);
settings = (ImageView)findViewById(R.id.homeSettingsButton);
quit = (ImageView)findViewById(R.id.homeExitButton);
Criteria crit=new Criteria();
locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locMan.getLastKnownLocation(LocationManager.GPS_PROVIDER);
LocLis = new LocationListener() {
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
if(location != null){
currLoc.setLatitude(location.getLatitude());
currLoc.setLongitude(location.getLongitude());
}
}
};
//Criteria crit = new Criteria();
if(currLoc !=null){
passloc[0] = currLoc.getLatitude();
passloc[1] = currLoc.getLongitude();
Toast.makeText(getApplicationContext(), "Lat:" + currLoc.getLatitude() + "\nLong:" + currLoc.getLongitude(), Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(getApplicationContext(), "Not Available", Toast.LENGTH_SHORT).show();
}
get.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(currLoc!=null){
Intent i = new Intent(HomeActivity.this, Screen2.class);
i.putExtra("Loc", passloc);
startActivity(i);
}
else{
Toast.makeText(getApplicationContext(), "Location Not Available", Toast.LENGTH_SHORT).show();
}
}
});
settings.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
// Intent j = new Intent(this, screen4.class);
// startActivity(j);
}
});
quit.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
}
#Override
public void onResume(){
super.onResume();
locMan.requestLocationUpdates(LocationManager.GPS_PROVIDER , 0, 0, LocLis);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home, menu);
return true;
}
}

currLoc is never initalized. Since location and currLoc are both Location you can change
if(location != null){
currLoc.setLatitude(location.getLatitude());
currLoc.setLongitude(location.getLongitude());
}
with
currLoc = location;

You didn't initialize passLoc. And you call getLastKnownLocation without saving the location itself.

Google Map API 2 not showning current location

I am try to showing current location using android google map api 2, I run this on my phone which is wifi enable.
But it always shows Longitude and Latitude 0.0 , 0.0 .
Here is my code
package com.google.map;
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.GoogleMap.OnMapLongClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.map.R;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Dialog;
import android.app.FragmentManager;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends Activity implements LocationListener{
private GoogleMap googlemap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(isGooglePlay())
{
setContentView(R.layout.activity_main);
setUpMap();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
if(item.getItemId() == R.id.action_legalnotices)
{
startActivity(new Intent(this, LegalNoticesActivity.class));
}
return super.onOptionsItemSelected(item);
}
private boolean isGooglePlay()
{
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if(status == ConnectionResult.SUCCESS)
{
return true;
}
else
{
((Dialog)GooglePlayServicesUtil.getErrorDialog(status, this, 10)).show();
Toast.makeText(getApplicationContext(), "Google play is not available.", Toast.LENGTH_LONG).show();
}
return false;
}
#SuppressLint("NewApi") private void setUpMap()
{
if(googlemap == null)
{
googlemap = ((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
if(googlemap != null)
{
// map code
googlemap.setMyLocationEnabled(true);
googlemap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
LocationManager lo = (LocationManager) getSystemService(LOCATION_SERVICE);
String provider = lo.getBestProvider(new Criteria(),true);
if(provider == null)
{
onProviderDisabled(provider);
}
else
{
onProviderEnabled(provider);
}
Location loc = lo.getLastKnownLocation(provider);
if(loc != null)
{
onLocationChanged(loc);
}
googlemap.setOnMapLongClickListener(onLongClickMapSettings());
}
}
}
private OnMapLongClickListener onLongClickMapSettings() {
// TODO Auto-generated method stub
return new OnMapLongClickListener() {
#Override
public void onMapLongClick(LatLng arg0) {
// TODO Auto-generated method stub
Log.i(arg0.toString(),"Long Click");
}
};
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
LatLng latlng = new LatLng(location.getLatitude(),location.getLongitude());
googlemap.moveCamera(CameraUpdateFactory.newLatLng(latlng));
googlemap.moveCamera(CameraUpdateFactory.zoomTo(5));
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Location lo = new Location(provider);
LatLng latlng = new LatLng(lo.getLatitude(),lo.getLongitude());
Log.i(latlng.toString(),"Current Location" );
googlemap.moveCamera(CameraUpdateFactory.newLatLng(latlng));
googlemap.moveCamera(CameraUpdateFactory.newLatLngZoom(latlng, 5));
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
Here is the Log cat value of my android application.
05-07 22:16:31.636: I/lat/lng: (0.0,0.0)(17967): Current Location

Move your Log.i(latlng.toString(),"Current Location" ); code to the onLocationChanged-method, you don't have a location yet in onProviderEnabled.

mMap.setMyLocationEnabled(true); // just add one line it wil work.

Getting Arraylist of a class into a ListView (android)

I'm having problems with linking the ArrayList of OverlayItems I have created in my CustomPinpoint class to the Listview. Basically I'm trying to display the markers I added on the map in a small list. But with the code below, I get a NullPointerException error. I understand why(I think its because I create 2 seperate instances of 'custom' which don't refer to each other), but I don't understand how I can solve it...
Thank you in advance.
package com.lars.pinpoint;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
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;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
import com.lars.pinpoint.R;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TabHost;
import android.widget.TextView;
import android.widget.Toast;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabHost.TabContentFactory;
public class Main extends MapActivity implements OnTabChangeListener{
/** Called when the activity is first created. */
private static final String LIST_TAB_TAG = "List";
private static final String MAP_TAB_TAG = "Map";
MapView map;
ListView listView;
TabHost tabHost;
long start;
long stop;
int x, y;
MyLocationOverlay compass;
MyLocationOverlay MyLoc;
MapController controller;
GeoPoint touchedPoint;
Drawable d;
List<Overlay> overlayList;
CustomPinpoint custom;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tabHost = (TabHost) findViewById(android.R.id.tabhost);
tabHost.setup();
listView = (ListView) findViewById(R.id.list);
listView.setEmptyView((TextView) findViewById(R.id.empty));
d = getResources().getDrawable(R.drawable.ic_launcher);
CustomPinpoint custom = new CustomPinpoint(d,Main.this);
listView.setAdapter(new ArrayAdapter<OverlayItem>(this, android.R.layout.simple_list_item_1, custom.pinpoints));
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
GeoPoint geoPoint = ((OverlayItem) listView.getAdapter().getItem(position)).getPoint();
if(geoPoint != null) {
map.getController().animateTo(geoPoint);
tabHost.setCurrentTab(1);
}
}
});
map = (MapView) findViewById(R.id.mapview);
map.setBuiltInZoomControls(true);
map.postInvalidate();
Touch t = new Touch();
overlayList = map.getOverlays();
overlayList.add(t);
compass = new MyLocationOverlay(Main.this, map);
overlayList.add(compass);
controller = map.getController();
MyLoc = new MyLocationOverlay(Main.this, map);
overlayList.add(MyLoc);
map.postInvalidate();
MyLoc.runOnFirstFix(new Runnable() {
public void run() {
map.getController().animateTo(MyLoc.getMyLocation());
}
});
tabHost.addTab(tabHost.newTabSpec(LIST_TAB_TAG).setIndicator("List").setContent(new TabContentFactory() {
public View createTabContent(String arg0) {
return listView;
}
}));
tabHost.addTab(tabHost.newTabSpec(MAP_TAB_TAG).setIndicator("Map").setContent(new TabContentFactory() {
public View createTabContent(String arg0) {
return map;
}
}));
//HACK to get the list view to show up first,
// otherwise the mapview would be bleeding through and visible
tabHost.setCurrentTab(1);
tabHost.setCurrentTab(0);
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
compass.disableCompass();
super.onPause();
MyLoc.disableMyLocation();
finish();
}
#Override
protected void onResume() {
// TODO Auto-generated method stub
compass.enableCompass();
super.onResume();
MyLoc.enableMyLocation();
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
class Touch extends Overlay {
public boolean onTouchEvent(MotionEvent e, MapView m) {
if (e.getAction() == MotionEvent.ACTION_DOWN) {
start = e.getEventTime();
x = (int) e.getX();
y = (int) e.getY();
touchedPoint = map.getProjection().fromPixels(x, y);
}
if (e.getAction() == MotionEvent.ACTION_UP) {
stop = e.getEventTime();
}
if (stop - start > 1500) {
AlertDialog alert = new AlertDialog.Builder(Main.this).create();
alert.setTitle("Pick an option.");
alert.setButton(DialogInterface.BUTTON_POSITIVE,"Place a pinpoint.",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
OverlayItem overlayItem = new OverlayItem(touchedPoint, "Pinpoint", "2nd String");
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
}
});
alert.setButton(DialogInterface.BUTTON_NEUTRAL,"Get address.",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
Geocoder geocoder = new Geocoder(getBaseContext(), Locale.getDefault());
try{
List<Address> address = geocoder.getFromLocation(touchedPoint.getLatitudeE6() /1E6, touchedPoint.getLongitudeE6()/1E6, 1);
if (address.size() > 0){
String display = "";
for (int i = 0; i < address.get(0).getMaxAddressLineIndex(); i++){
display += address.get(0).getAddressLine(i) + "\n";
}
Toast t3 = Toast.makeText(getBaseContext(), display, Toast.LENGTH_LONG);
t3.show();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
}
}
});
alert.setButton(DialogInterface.BUTTON_NEGATIVE,"Toggle View", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if (map.isSatellite()){
map.setSatellite(false);
}else{
map.setSatellite(true);
}
}
});
alert.show();
return true;
}
return false;
}
}
public void gpsCurrentLocation()
{
tabHost.setCurrentTab(1);
GeoPoint p = MyLoc.getMyLocation();
map.getController().animateTo(p);
}
// Menu XML file (menu.xml)
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.activity_main, menu);
return true;
}
/**
* Event Handling for Individual menu item selected
* Identify single menu item by it's id
* */
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.my_location:
Toast.makeText(Main.this, "Moving To Current location", Toast.LENGTH_SHORT).show();
gpsCurrentLocation();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void onTabChanged(String tabId) {
// TODO Auto-generated method stub
}
}

Use custom = new CustomPinpoint(d,Main.this);
instead of
CustomPinpoint custom = new CustomPinpoint(d,Main.this);

Maps Place Click save that location to Android Listview?

I am displaying the Google maps in the Android program.How can i save the places to Android Listview whenever I Click On One place in the map.
By this I am Getting the search place in the maps
package com.commonsware.android.nooer;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnClickListener;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
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;
import com.google.android.maps.OverlayItem;
public class SampleMpas extends MapActivity {
MapView mapView;
MapController mapController;
GeoPoint mgeoPoint;
Drawable marker;
MyLocationOverlay mLocationOverlay;
MotionEvent e;
public void changeMap(String area)
{
MapController mc=mapView.getController();
GeoPoint myLocation=null;
double lat = 0;
double lng = 0;
try
{
Geocoder g = new Geocoder(this, Locale.getDefault());
java.util.List<android.location.Address> result=g.getFromLocationName(area, 1);
if(result.size()>0){
Toast.makeText(SampleMpas.this, "country: " + String.valueOf(result.get(0).getCountryName()), Toast.LENGTH_SHORT).show();
lat = result.get(0).getLatitude();
lng = result.get(0).getLongitude();
}
else{
Toast.makeText(SampleMpas.this, "record not found", Toast.LENGTH_SHORT).show();
return;
}
}
catch(IOException io)
{
Toast.makeText(SampleMpas.this, "Connection Error", Toast.LENGTH_SHORT).show();
}
myLocation = new GeoPoint(
(int) (lat * 1E6),
(int) (lng * 1E6));
Drawable drawable = this.getResources().getDrawable(R.drawable.icon);
mc.animateTo(myLocation);
mc.setZoom(15);
mapView.invalidate();
}
#Override
protected void onCreate(Bundle icicle) {
// TODO Auto-generated method stub
super.onCreate(icicle);
setContentView(R.layout.main);
Button btnSearch=(Button) findViewById(R.id.btnSearch);
btnSearch.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
EditText txtSearch=(EditText)findViewById(R.id.txtMapSearch);
String area=txtSearch.getText().toString();
Toast.makeText(SampleMpas.this, "Click-" + String.valueOf(area), Toast.LENGTH_SHORT).show();
SampleMpas.this.changeMap(area);
}
});
mapView = (MapView) findViewById(R.id.map);
mapController = mapView.getController();
mapView.setBuiltInZoomControls(true);
marker = getResources().getDrawable(R.drawable.marker);
marker.setBounds(0, 0, marker.getIntrinsicWidth(), marker
.getIntrinsicHeight());
mapView.getOverlays().add(new MapOverlay(marker));
mLocationOverlay = new MyLocationOverlay(this, mapView);
mapView.getOverlays().add(mLocationOverlay);
}
#Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
switch (id) {
case 0:
return new AlertDialog.Builder(this).setTitle("Are You Want save this place As?").setIcon(
R.drawable.icon).setPositiveButton("Favorite",
new OnClickListener() {
public void onClick(DialogInterface dialog , int which) {
// TODO Auto-generated method stub
}
}).setCancelable(true).setNegativeButton("Cancel",
new OnClickListener() {
public void onClick(DialogInterface dialog , int which) {
// TODO Auto-generated method stub
}
}).setCancelable(true).setNeutralButton("Business", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
})
.setOnCancelListener(new OnCancelListener() {
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Dismiss",
Toast.LENGTH_SHORT).show();
}
}).create();
default:
break;
}
return null;
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
Point scrPoint;
private GeoPoint getPoint(double lat , double lon) {
return (new GeoPoint((int) (lat * 1E6), (int) (lon * 1E6)));
}
class MapOverlay extends
com.google.android.maps.ItemizedOverlay<OverlayItem> {
List<OverlayItem> ListofGeopoints = new ArrayList<OverlayItem>();
public MapOverlay(Drawable defaultMarker ) {
super(defaultMarker);
double lat = 0;
double lang = 0;
ListofGeopoints.add(new OverlayItem(getPoint(lat, lang),
"IN", "India"));
populate();
}
#Override
protected boolean onTap(int index) {
switch (index) {
case 0:
Toast.makeText(getApplicationContext(), "GeoLocation : 0",
Toast.LENGTH_LONG).show();
showDialog(0);
break;
}
return true;
}
String add = "";
List<Address> add_List = new ArrayList<Address>();
private void getAddress() {
/* add_List = ReverseGeocode
.getFromLocation(35.594227, -105.223618, 2);
*/
}
#Override
protected OverlayItem createItem(int i) {
return (ListofGeopoints.get(i));
}
#Override
public int size() {
return ListofGeopoints.size();
}
}
}
Thanks in Advance.

You can get the geo points of the Touched location by
#Override
public boolean onTap(GeoPoint p , MapView mapView)
Write a class which derives from the Overlay class and override the onTap() method. Then you can add your overlay to the your MapView. A GeoPoint object, which represents the position of you tap, is passed to the onTap() method when you tab somewhere on the map. Save this Geo points in your DB and populate your list view from the database.
Sample Code: Overlay Class:
class MapOverlay extends
com.google.android.maps.ItemizedOverlay<OverlayItem> {
#Override
public boolean onTap(GeoPoint p , MapView mapView) {
// TODO Auto-generated method stub
Log.i("Latitude" , String.valueOf(p.getLatitudeE6()/1E6));
Log.i("Longitude", String.valueOf(p.getLongitudeE6()/1E6));
return super.onTap(p, mapView);
}

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
}
}