This is the code i written to get the gps coordinates of the mobile and point the place where you are. But in improvement I need to get 1km radius circle. How can i get it?
package m.a.p;
public class MappingActivity extends MapActivity {
MapController mControl;
GeoPoint GeoP;
MapView mapV;
Drawable d;
List<Overlay> overlaylist;
public double lat;
public double lng;
Button checkin, addplace;
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in
// Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 10000; // in
// Milliseconds
protected LocationManager locationManager;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapV = (MapView) findViewById(R.id.mapview);
checkin = (Button) findViewById(R.id.check);
addplace = (Button) findViewById(R.id.addp);
overlaylist = mapV.getOverlays();
d = getResources().getDrawable(R.drawable.point);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES, new MyLocationListener());
Location location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
lat = location.getLatitude();
lng = location.getLongitude();
}
Button check = (Button) findViewById(R.id.check);
Button addplace = (Button) findViewById(R.id.addp);
Button nearby = (Button) findViewById(R.id.point);
check.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
TextView result = (TextView) findViewById(R.id.result);
result.setText("Checked the Plce");
}
});
addplace.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
TextView result = (TextView) findViewById(R.id.result);
result.setText("Added the Plce");
}
});
nearby.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
TextView result = (TextView) findViewById(R.id.result);
result.setText("Nearby the Plce");
}
});
}
#Override
protected boolean isRouteDisplayed() {
return false;
}
public class MyLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
String message = String.format("You are Here");
Toast.makeText(MappingActivity.this, message, Toast.LENGTH_LONG)
.show();
GeoP = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
mControl = mapV.getController();
mControl.animateTo(GeoP);
mControl.setZoom(19);
OverlayItem overlayItem = new OverlayItem(GeoP, "You are Here",
"Point");
CustomPinpoint custom = new CustomPinpoint(d, MappingActivity.this);
custom.insertPinpoint(overlayItem);
overlaylist.add(custom);
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
}
custompinpoint
public class CustomPinpoint extends ItemizedOverlay{
private ArrayList<OverlayItem> pinpoints = new ArrayList <OverlayItem>();
private Context c;
public CustomPinpoint(Drawable defaultMarker) {
super(boundCenter(defaultMarker));
}
public CustomPinpoint(Drawable m, Context context){
this(m);
c = context;
}
#Override
protected OverlayItem createItem(int i) {
// TODO Auto-generated method stub
return pinpoints.get(i);
}
#Override
public int size() {
return pinpoints.size();
}
public void insertPinpoint(OverlayItem item){
pinpoints.add(item);
this.populate();
}
}
Try to use a custom MapOverlay to draw your location and a circle around it whit overriding onDraw() method:
public class MyOwnLocationOverlay extends MyLocationOverlay{
private MapView mapView;
private Paint circlePainter;
private Point screenCurrentPoint;
private GeoPoint geoCurrentPoint;
private int meters;
public MyOwnLocationOverlay(Context context, MapView mapView) {
super(context, mapView);
this.mapView = mapView;
}
// This method is used to get user submitted radius from our application
public void setMeters(int meters) {
this.meters = meters;
}
#Override
public synchronized boolean draw(Canvas canvas, MapView mapView,
boolean shadow, long when) {
// Set the painter to paint our circle. setColor = blue, setAlpha = 70 so the background
// can still be seen. Feel free to change these settings
circlePainter = new Paint();
circlePainter.setAntiAlias(true);
circlePainter.setStrokeWidth(2.0f);
circlePainter.setColor(0xff6666ff);
circlePainter.setStyle(Style.FILL_AND_STROKE);
circlePainter.setAlpha(70);
// Get projection from the mapView.
Projection projection = mapView.getProjection();
// Get current location
geoCurrentPoint = getMyLocation();
screenCurrentPoint = new Point();
// Project the gps coordinate to screen coordinate
projection.toPixels(geoCurrentPoint, screenCurrentPoint);
int radius = metersToRadius(geoCurrentPoint.getLatitudeE6() /1000000);
// draw the blue circle
canvas.drawCircle(screenCurrentPoint.x, screenCurrentPoint.y, radius, circlePainter);
return super.draw(canvas, mapView, shadow, when);
}
// hack to get more accurate radius, because the accuracy is changing as the location
// getting further away from the equator
public int metersToRadius(double latitude) {
return (int) (mapView.getProjection().metersToEquatorPixels(meters) * (1/ Math.cos(Math.toRadians(latitude))));
}
}
see this link for more details
Related
i've created a map, but when on the phone, it doesn't move to my location (taken from gps). why?
Because i need to retrieve the user location, and in case i've found it, animate the map to that point and refresh it (to take the pin from the db). in negative case, i put the center to Milano.
public class Mappa extends MapActivity {
private MapView mapView;
double latitudine=0;
double longitudine=0;
int kilometri=20;
#Override
protected boolean isRouteDisplayed() {
return false;
}
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mappa);
mapView = (MapView) findViewById(R.id.mapview);
MapController mapController = mapView.getController();
final MyLocationOverlay myLocationOverlay;
mapView.setBuiltInZoomControls(true);
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.pin_bioscalin);
MyOverlays itemizedoverlay = new MyOverlays(drawable, this);
// milano
latitudine = 45.464164;
longitudine = 9.190321;
GeoPoint mio_point = new GeoPoint((int)(latitudine*1E6), (int)(longitudine*1E6));
mapController.setCenter(mio_point);
mapController.animateTo(mio_point);
mapController.setZoom(11);
// GPS
LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
// farmacie
Database_mio db=new Database_mio(this);
db.openDataBase();
Cursor data=db.elenco_negozi_mappa(latitudine,longitudine,kilometri);
data.moveToFirst();
do {
String id_farmacia = data.getString(data
.getColumnIndex("_id"));
String ragione_farmacia = data.getString(data
.getColumnIndex("ragione"));
String indirizzo_farmacia = data.getString(data
.getColumnIndex("ragione"));
int latitude_farmacia = (int) (data.getDouble(data
.getColumnIndex("lat")) * 1E6);
int longitude_farmacia = (int) (data.getDouble(data
.getColumnIndex("lng")) * 1E6);
GeoPoint point = new GeoPoint(latitude_farmacia,longitude_farmacia);
OverlayItem overlayitem = new OverlayItem(point,ragione_farmacia,indirizzo_farmacia);
itemizedoverlay.addOverlay(overlayitem);
} while (data.moveToNext());
mapOverlays.add(itemizedoverlay);
// disclamer
ImageView img = (ImageView) findViewById(R.id.image_mia_map);
img.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent disclamer = new Intent(getParent(), Disclamer.class);
disclamer.putExtra("da_dove", "Mappa");
TabGroupActivity parentActivity = (TabGroupActivity)getParent();
parentActivity.startChildActivity("Disclamer", disclamer);
}
});
}
/* Class My Location Listener */
public class MyLocationListener implements LocationListener{
#Override
public void onLocationChanged(Location loc){
loc.getLatitude();
loc.getLongitude();
String Text = "La mia posizione: "+"Latitudine = "+loc.getLatitude()+"Longitudine = "+loc.getLongitude();
GeoPoint mio_point = new GeoPoint((int)(loc.getLatitude()*1E6), (int)(loc.getLongitude()*1E6));
mapView.getController().setCenter(mio_point);
mapView.getController().animateTo(mio_point);
Toast.makeText( getApplicationContext(),Text,Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider){
Toast.makeText( getApplicationContext(),"Gps disabilitato",Toast.LENGTH_SHORT ).show();
}
#Override
public void onProviderEnabled(String provider){
Toast.makeText( getApplicationContext(),"Gps abilitato",Toast.LENGTH_SHORT).show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras){
}
}
}
thanks to all.
I'm using this codes to view the current location of the user. But I also need to put a marker on it. I already saw a few tutorial regarding this but I still don't get it.
Here's my Activity
public class MapViewActivity extends MapActivity {
#Override
protected void onCreate(Bundle arg0) {
// TODO Auto-generated method stub
super.onCreate(arg0);
setContentView(R.layout.mapview);
//------------Start Displaying Map View--------------//
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude() * 1E6);
int lng = (int) (location.getLongitude() * 1E6);
GeoPoint test= new GeoPoint(
lat,lng);
MapView mapview = (MapView) findViewById(R.id.mvmap);
MapController mapcontrol = mapview.getController();
mapcontrol.animateTo(test);
mapcontrol.setZoom(10);
mapview.setStreetView(true);
mapview.setSatellite(true);
mapview.setBuiltInZoomControls(true);
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
};
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
use this class for ItemizedOverlay.
public class CustomItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>();
private Context context;
public CustomItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public CustomItemizedOverlay(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) {
OverlayItem item = mapOverlays.get(index);
Log.e(" on tap item value ", "" + mapOverlays.get(index) + " Index "
+ index);
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
public void addOverlay(OverlayItem overlay) {
mapOverlays.add(overlay);
this.populate();
}
public void removeOverlay() {
mapOverlays.clear();
// this.populate();
}
}
In your MapViewActivity ,declare ,
CustomItemizedOverlay itemizedOverlay;
List<Overlay> mapOverlays;
mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
itemizedOverlay = new CustomItemizedOverlay(drawable, this);
OverlayItem overlayitem = new OverlayItem(test," "," ");
itemizedOverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedOverlay);
Hi all I am trying to implement an overlay onto my google map. However I am receiving a fatal error at runtime and it seems to be some sort of NullPointerException. The app runs properly when I remove the "overlayList = mapView.getOverlays();" and "overlayList.add(t);" lines of code. Any help is greatly appreciated!
Main Activity:
public class CSActivity extends MapActivity implements LocationListener {
MapController mapController;
MapView mapView;
LocationManager locationManager;
MyLocationOverlay myLocationOverlay;
MyLocationOverlay compass;
private Button click_but;
private Button exit_but;
long start;
long stop;
int x,y;
GeoPoint touchedPoint;
Drawable d;
List<Overlay> overlayList;
String towers;
int lat;
int lng;
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.main); // bind the layout to the activity
click_but = new Button(this);
click_but = (Button)findViewById(R.id.clickBtn);
exit_but = new Button(this);
exit_but = (Button)findViewById(R.id.exitBtn);
d = getResources().getDrawable(R.drawable.markerblue);
Touchy t = new Touchy();
overlayList = mapView.getOverlays();
overlayList.add(t);
/*compass = new MyLocationOverlay(CSActivity.this, mapView);
overlayList.add(compass);*/
// Configure the Map
mapView = (MapView) findViewById(R.id.mapView);
mapView.setBuiltInZoomControls(true);
mapView.setSatellite(true);
mapController = mapView.getController();
mapController.setZoom(20); // Zoom 1 is world view
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
myLocationOverlay = new MyLocationOverlay(this, mapView);
mapView.getOverlays().add(myLocationOverlay);
Criteria crit = new Criteria();
towers = locationManager.getBestProvider(crit, false);
Location L = locationManager.getLastKnownLocation(towers);
if (L != null){
lat = (int) (L.getLatitude()*1E6);
lng = (int) (L.getLongitude()*1E6);
GeoPoint ourLocation = new GeoPoint(lat, lng);
OverlayItem overlayItem = new OverlayItem(ourLocation, "What's up", "2nd String");
MyItemizedOverlay custom = new MyItemizedOverlay(d, CSActivity.this);
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
}else{
Toast.makeText(CSActivity.this, "Couldn't get provider", Toast.LENGTH_SHORT).show();
}
final CSActivity home = this;
exit_but.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v)
{
Intent intent = new Intent();
intent.setClass(home, homeActivity.class);
startActivity(intent);
}
});
click_but.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v)
{
}
});
}
#Override
protected boolean isRouteDisplayed() {
return false;
}
#Override
protected void onResume() {
super.onResume();
myLocationOverlay.enableMyLocation();
myLocationOverlay.enableCompass();
locationManager.requestLocationUpdates(towers, 500, 1, this);
}
#Override
protected void onPause() {
super.onResume();
myLocationOverlay.disableMyLocation();
myLocationOverlay.disableCompass();
locationManager.removeUpdates(this);
}
class Touchy 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 = mapView.getProjection().fromPixels(x, y);
}
if (e.getAction() == MotionEvent.ACTION_UP){
stop = e.getEventTime();
}
if (stop - start > 1000){
//Perform action
AlertDialog alert = new AlertDialog.Builder(CSActivity.this).create();
alert.setTitle("Pick an Option");
alert.setMessage("I said pick!");
alert.setButton("place a pinpoint", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
OverlayItem overlayItem = new OverlayItem(touchedPoint, "What's up", "2nd String");
MyItemizedOverlay custom = new MyItemizedOverlay(d, CSActivity.this);
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
}
});
alert.setButton2("get address", new DialogInterface.OnClickListener() {
#Override
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 t = Toast.makeText(getBaseContext(), display, Toast.LENGTH_LONG);
t.show();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally{
}
}
});
alert.show();
return true;
}
return false;
}
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
lat = (int) (location.getLatitude() *1E6);
lng = (int) (location.getLongitude()*1E6);
}
#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
}
}
Itemized Overlay Activity:
public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> pinpoints = new ArrayList<OverlayItem>();
private Context c;
public MyItemizedOverlay(Drawable defaultMarker) {
super(boundCenter(defaultMarker));
// TODO Auto-generated constructor stub
}
public MyItemizedOverlay(Drawable m, Context context) {
// TODO Auto-generated constructor stub
this(m);
c = context;
}
#Override
protected OverlayItem createItem(int i) {
// TODO Auto-generated method stub
return pinpoints.get(i);
}
#Override
public int size() {
// TODO Auto-generated method stub
return pinpoints.size();
}
public void insertPinpoint(OverlayItem item) {
pinpoints.add(item);
this.populate();
}
}
Main XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center" >
<com.google.android.maps.MapView
android:id="#+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
android:apiKey="(key here)"
android:clickable="true"
android:enabled="true" />
<Button
android:id="#+id/clickBtn"
style="#style/ButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="#drawable/blue"
android:text="Click" />
<Button
android:id="#+id/exitBtn"
style="#style/ButtonText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="#drawable/red"
android:text="Home" />
</RelativeLayout>
mapView is null so get NPE first give refrences from xml file
mapView = (MapView) findViewById(R.id.mapView);
then get overlays
overlayList = mapView.getOverlays();
and
if(null!=overlayList&&overlayList.size()!=0){
overlayList.add(t);
}
Why NullPointerException ?
You are getting Overlay of mapview before define MapView so, you will got null pointer expection..
So first define mapview control after then use it.
mapView = (MapView) findViewById(R.id.mapView);
overlayList = mapView.getOverlays();
I am working on an android application that determines user location in osm maps. I am being able to show user location on the map, but if the location change the whole map is reloaded, what’s wrong with that? Also how I can increase the accuracy of the user location? And how can I make a circle that increase and decrease according to the accuracy(as shown in Google one)?
code :
public class OsmDemoActivity extends Activity implements LocationListener,
MapViewConstants
{
private MapView mMapView;
private MapController mapController;
private LocationManager mLocMgr;
private ItemizedOverlay<OverlayItem> mMyLocationOverlay;
private ResourceProxy mResourceProxy;
ArrayList<OverlayItem> items;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
mResourceProxy = new DefaultResourceProxyImpl(getApplicationContext());
setContentView(R.layout.main);
//mMapView.setUseDataConnection(false);
initilaizeMap();
//addOverlay();
mLocMgr = (LocationManager) getSystemService(LOCATION_SERVICE);
mLocMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
public void initilaizeMap()
{
mMapView = (MapView) this.findViewById(R.id.mapView);
mMapView.setTileSource(TileSourceFactory.MAPNIK);
//mMapView.setUseDataConnection(false);
mMapView.setBuiltInZoomControls(true);
mMapView.setMultiTouchControls(true);
mapController = this.mMapView.getController();
mapController.setZoom(15);
mapController.setCenter(new GeoPoint(15.610762,32.540345));
/*
final MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, mMapView,
mResourceProxy);
myLocationOverlay.enableMyLocation();
//myLocationOverlay.disableMyLocation(); // not on by default
myLocationOverlay.disableCompass();
myLocationOverlay.disableFollowLocation();
myLocationOverlay.setDrawAccuracyEnabled(true);
myLocationOverlay.runOnFirstFix(new Runnable() {
public void run() {
mapController.animateTo(myLocationOverlay
.getMyLocation());
}
});
//ArrayList<OverlayItem> mOsmOverlays;
//mOsmOverlays.add(myLocationOverlay);
*/
}
public void addOverlay()
{
GeoPoint point2 = new GeoPoint(53554070, -2959520); // centre map here
GeoPoint point3 = new GeoPoint(53554070 + 1000, -2959520 + 1000); // icon goes here
GeoPoint point4 = new GeoPoint(15.610844, 32.540045);
GeoPoint point5 = new GeoPoint(15610844 + 40, 32540045 + 40);
GeoPoint point6 = new GeoPoint(15610844 + 50, 32540045 + 50);
GeoPoint point7 = new GeoPoint(15610844 + 10, 32540045 +10);
mapController.setCenter(point4);
items = new ArrayList<OverlayItem>();
// Put overlay icon a little way from map center
items.add(new OverlayItem("Here5", "SampleDescription", point5));
items.add(new OverlayItem("Here6", "SampleDescription", point6));
items.add(new OverlayItem("Here7", "SampleDescription", point7));
/* OnTapListener for the Markers, shows a simple Toast. */
this.mMyLocationOverlay = new ItemizedIconOverlay<OverlayItem>(items,
new ItemizedIconOverlay.OnItemGestureListener<OverlayItem>() {
#Override
public boolean onItemSingleTapUp(final int index,
final OverlayItem item) {
Toast.makeText(
OsmDemoActivity.this,
"Item onItemSingleTapUp '" + item.mTitle, Toast.LENGTH_LONG).show();
return true; // We 'handled' this event.
}
#Override
public boolean onItemLongPress(final int index,
final OverlayItem item) {
Toast.makeText(
OsmDemoActivity.this,
"Item onItemLongPress '" + item.mTitle ,Toast.LENGTH_LONG).show();
return false;
}
}, mResourceProxy);
this.mMapView.getOverlays().add(this.mMyLocationOverlay);
mMapView.invalidate();
}
public void displayLocation(GeoPoint loc)
{
mapController.setCenter(loc);
items = new ArrayList<OverlayItem>();
// Put overlay icon a little way from map center
items.add(new OverlayItem("Here u r", "SampleDescription", loc));
/* OnTapListener for the Markers, shows a simple Toast. */
this.mMyLocationOverlay = new ItemizedIconOverlay<OverlayItem>(items,
new ItemizedIconOverlay.OnItemGestureListener<OverlayItem>() {
#Override
public boolean onItemSingleTapUp(final int index,
final OverlayItem item) {
Toast.makeText(
OsmDemoActivity.this,
"Item onItemSingleTapUp '" + item.mTitle, Toast.LENGTH_LONG).show();
return true; // We 'handled' this event.
}
#Override
public boolean onItemLongPress(final int index,
final OverlayItem item) {
Toast.makeText(
OsmDemoActivity.this,
"Item onItemLongPress '" + item.mTitle ,Toast.LENGTH_LONG).show();
return false;
}
}, mResourceProxy);
mMapView.getOverlays().clear();
this.mMapView.getOverlays().add(this.mMyLocationOverlay);
//mMapView.invalidate();
}
public void onLocationChanged(Location location)
{
int lat = (int) (location.getLatitude() * 1E6);
int lng = (int) (location.getLongitude() * 1E6);
GeoPoint gpt = new GeoPoint(lat, lng);
//mapController.setCenter(gpt);
//mMapView.invalidate();
displayLocation(gpt);
}
#Override
public void onProviderDisabled(String arg0) {}
#Override
public void onProviderEnabled(String provider) {}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
You must use an location change listener
Maybe this can help you
Listener:
package dispatch.driver.osmMaps;
import org.osmdroid.util.GeoPoint;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.widget.Toast;
public class OsmGeoUpdateHandler implements LocationListener
{
private OsmMapsActivity mMapActivity;
public OsmGeoUpdateHandler(OsmMapsActivity aMapActivity)
{
this.mMapActivity = aMapActivity;
}
#Override
public void onLocationChanged(Location location)
{
Toast.makeText(mMapActivity,
"latitude = " + location.getLatitude() * 1e6 + " longitude = " + location.getLongitude() * 1e6,
Toast.LENGTH_SHORT).show();
int latitude = (int) (location.getLatitude() * 1E6);
int longitude = (int) (location.getLongitude() * 1E6);
GeoPoint point = new GeoPoint(latitude, longitude);
mMapActivity.updateCarPosition(point);
}
#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
}
}
OsmMapActivity class (how to use listener)
public class OsmMapsActivity extends Activity
{
// final private int MAP_DEFAULT_ZOOM = 14;
final private double MAP_DEFAULT_LATITUDE = 44.445883;
final private double MAP_DEFAULT_LONGITUDE = 26.040963;
private MapView mMapView;
private ResourceProxy mResourceProxy;
private OsmMapsItemizedOverlay mItemizedOverlay;
private MyLocationOverlay mMyLocationOverlay;
private LocationManager locationManager;
private OverlayItem lastPosition = null;
private Order mOrder;
OsmGeoUpdateHandler mUpdateHandler;
private ArrayList<OverlayItem> mItems = new ArrayList<OverlayItem>();
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// Specify the XML layout to use:
setContentView(R.layout.osmmap);
mResourceProxy = new DefaultResourceProxyImpl(getApplicationContext());
mMapView = (MapView) findViewById(R.id.mapview);
// Setup the mapView controller:
mMapView.setBuiltInZoomControls(true);
mMapView.setMultiTouchControls(true);
mMapView.setClickable(true);
mMapView.setUseDataConnection(false);
mMapView.setTileSource(TileSourceFactory.MAPNIK);
mMapView.getController().setZoom(12);
/* location manager */
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mUpdateHandler = new OsmGeoUpdateHandler(this);
Location location = null;
for (String provider : locationManager.getProviders(true))
{
location = locationManager.getLastKnownLocation(provider);
if (location != null)
{
//location.setLatitude(MAP_DEFAULT_LATITUDE);
//location.setLongitude(MAP_DEFAULT_LONGITUDE);
locationManager.requestLocationUpdates(provider, 0, 0, mUpdateHandler);
break;
}
}
//add car position
if (location == null)
{
location = new Location(LocationManager.GPS_PROVIDER);
location.setLatitude(MAP_DEFAULT_LATITUDE);
location.setLongitude(MAP_DEFAULT_LONGITUDE);
updateCarPosition(new GeoPoint(location));
}
} // end onCreate()
public void updateCarPosition(GeoPoint aPoint)
{
if (mItemizedOverlay == null)
{
return;
}
OverlayItem overlayItem;
/* remove last position marker */
removeLastPosition(lastPosition);
overlayItem = new OverlayItem("Center", "Center", (GeoPoint) aPoint);
lastPosition = overlayItem;
mItemizedOverlay.addOverlay(overlayItem);
mMapView.getOverlays().add(mItemizedOverlay);
mMapView.getController().animateTo(aPoint);
}
}
I am working on a project that has one feature to display (animate to) current user location and one hard coded location(given latitude and longitude). So far I have the hardcoded location working but I can't figure out how to get the user location. I've tried the location listener but my application keeps crashing after I run it. Does anybody have any advice on it? Much appreciated. Here's the code:
public class LocationsActivity extends MapActivity implements LocationListener {
MapView mapView;
MapController mc;
GeoPoint p;
LocationListener locListener;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location);
mapView = (MapView)findViewById(R.id.mapView);
mapView.setBuiltInZoomControls(true);
mc = mapView.getController();
String coordinates[] = {"52.67596","-8.64910"};
double lat = Double.parseDouble(coordinates[0]);
double lng = Double.parseDouble(coordinates[1]);
p = new GeoPoint((int)(lat*1E6),(int)(lng*1E6));
OverlayItem overlayitem = new OverlayItem(p, "Limerick Institute of
Technology", "Moylish");
mc.animateTo(p);
mc.setZoom(17);
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.pushpin);
HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable,
this);
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
mapView.invalidate();
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
public void onLocationChanged(Location arg0) {
// TODO Auto-generated method stub
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
if you are using MapActivity then you can use following code:
/**
* Set current location using MyLocationOverlay
*/
public void setCurrentLocation() {
myLocationOverlay.runOnFirstFix(new Runnable() {
#Override
public void run() {
if (null != myLocationOverlay.getMyLocation()) {
/**
* Put extra sleep to avoid concurrentModicationException
*/
try {
Thread.sleep(1000);
} catch (Exception e) {
// TODO: handle exception
}
map.getController().animateTo(
myLocationOverlay.getMyLocation());
map.getOverlays().add(myLocationOverlay);
}
}
});
}
If you are using MapFragment then inside activity:
1. mapFragment.getMap().setMyLocationEnabled(true);
then call
private void moveMapToMyLocation() {
LocationManager locMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria crit = new Criteria();
Location loc = locMan.getLastKnownLocation(locMan.getBestProvider(crit,
false));
CameraPosition camPos = new CameraPosition.Builder()
.target(new LatLng(loc.getLatitude(), loc.getLongitude()))
.zoom(12.8f)
.build();
CameraUpdate camUpdate = CameraUpdateFactory.newCameraPosition(camPos);
mapFragment.getMap().moveCamera(camUpdate);
}
I am building an app in ICS with a mapview within a Fragment.
After initializing the mapView in the activity class I pass it to the mapFragment which is the fragment that is used to display the map.
This is some of the code in my activity class :
mapView = new MapView(this, getString(R.string.mapsAPI));
myLocationOverlay = new MyLocationOverlay(this, mapView);
mapView.getOverlays().add(this.myLocationOverlay);
mapView.postInvalidate();
public void calculateLocation() {
setLocationManager();
setLocation();
setGeoPoint(location);
}
public void setGeoPoint(Location location) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
geoPoint = new GeoPoint((int)( latitude * 1E6), (int)( longitude * 1E6 ));
}
public void setLocation() {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
public void setLocationManager() {
locationManager = ((LocationManager)getSystemService(Context.LOCATION_SERVICE));
}
and this is the code in my mapFragment class :
public class MapFragment extends Fragment
{
MapView gMap = null;
GeoPoint gPoint = null;
Location location = null;
public View onCreateView(LayoutInflater paramLayoutInflater, ViewGroup paramViewGroup, Bundle paramBundle) {
gMap = ((NFCDemoActivity)getActivity()).getMapView();
return this.gMap;
}
public void onActivityCreated(Bundle paramBundle) {
super.onActivityCreated(paramBundle);
((NFCDemoActivity)getActivity()).calculateLocation();
gPoint = ((NFCDemoActivity)getActivity()).getGeoPoint();
gMap.setClickable(true);
gMap.setBuiltInZoomControls(true);
gMap.getController().setZoom(18);
gMap.getController().setCenter(gPoint);
}
public void onDestroy() {
super.onDestroy();
}
}
This will give you the user's current location.