How to get latitude and longitude with a custom GeoPointer - android

I have a GPS map and want to use a custom geopoint (using a my PNG) that when I click on a place in the map returns latitude and longitude.
Searching I have found this code
public void recieveLongClick(MotionEvent ev)
{
Projection p = mapView.getProjection();
GeoPoint geoPoint = p.fromPixels((int) ev.getX(), (int) ev.getY());
// You can now pull lat/lng from geoPoint
}
But I don't know how to use this and how to define a GeoPointer with a custom image that is showed when someone click on a place in the map.

Related

Android - Getting coordinates out of GeoPoint-Object

look at this:
MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, mapView);
myLocationOverlay.enableMyLocation();
myLocationOverlay.enableCompass();
GeoPoint myGeoPoint = myLocationOverlay.getMyLocation();
That works fine. But i need to save the coordinates in a variable. So i tried this:
myLocationLon = (double) myGeoPoint.getLongitudeE6();
When i run the App, this last line makes it collapse. Can you please tell me why this doesn't work ? Thank you
GeoPoint.getLongitudeE6() and GeoPoint.getLatitudeE6() both return microdegrees (basically degrees * 1E6).
so you need to convert microdegrees to degrees simply write function:
public double microDegreesToDegrees(int microDegrees) {
return microDegrees / 1E6;
}
and then
myLocationLon = microDegreesToDegrees(myGeoPoint.getLongitudeE6());

How to properly use drawMyLocation

I am trying to show the users current location with the default blue dot in android. In my maps page I also have a layout that shows different points of interest. Im having trouble figuring out what to put for some of the variables and was wondering if someone could help me out.
This is what I'm using so far to show my location.
Location location = locationManager
.getLastKnownLocation(bestProvider);
try {
GeoPoint myPoint2 = new GeoPoint(
(int) (location.getLatitude() * 1E6),
(int) (location.getLongitude() * 1E6));
newoverlay.drawMyLocation(null, mapView, location, myPoint2,
1000);
mapOverlays.add(newoverlay);
} catch (NullPointerException e) {
GeoPoint myPoint2 = new GeoPoint((int) (-1 * 1E6),
(int) (-1 * 1E6));
**newoverlay.drawMyLocation(null, mapView, location, myPoint2,
1000);**
mapOverlays.add(newoverlay);
}
I'm not sure what to put as the Canvas so I placed it with null so that it would compile. I'm using the location from a location Manager and I have my geopoint from the location variable. I'm also unsure what the "when" parameter is supposed to be.
I was also wondering how the blue bubble knows to move with the person, does the picture update every x milliseconds depending on the "when" parameter?
So far the app isn't crashing, but it is also not showing the blue dot at any location.
I'm sure I just need help with finding what the canvas parameter should be.
Thanks
try this way in your map activity
class CurOverlay extends Overlay {
private GeoPoint pointToDraw;
public void setPointToDraw(GeoPoint point) {
pointToDraw = point;
}
public GeoPoint getPointToDraw() {
return pointToDraw;
}
#Override
public boolean draw(Canvas canvas, MapView curmapView, boolean shadow,
long when) {
super.draw(canvas, curmapView, shadow);
// convert point to pixels
Point screenPts = new Point();
curmapView.getProjection().toPixels(pointToDraw, screenPts);
// add marker
Bitmap bmp = BitmapFactory.decodeResource(getResources(),
R.drawable.pinsource);
canvas.drawBitmap(bmp, screenPts.x - 28, screenPts.y - 48, null);
return true;
}
}
i hope this will work for you.

How to set mapview to not show my current location?

how to coding to set mapview don't show the current location
now it's not show on emulater but when I try to install on my mobile , the current location sigh will show
What should I do?
public static int getCoordinateE6(double coordinate) {
return (int) (coordinate * 1E6);
}
GeoPoint geoPoint = new GeoPoint(
GoogleMapServiceHelper.getCoordinateE6(latitude),
GoogleMapServiceHelper.getCoordinateE6(longitude));
getMapView().getController().animateTo(geoPoint);

How to get the Latitude and Longitude on Map in Android?

How can I get the Latitude and Longitude values of a particular location that I have long clicked on the map in Android?
For the long click, I suggest you check out http://www.kind-kristiansen.no/2010/handling-longpresslongclick-in-mapactivity/. This will go into detail on how to listen for long click events within the Maps API since there is little or no built-in functionality that I know of.
As for the lat/lng code, after you get the long click you can translate the pixels to coordinates.
public void recieveLongClick(MotionEvent ev)
{
Projection p = mapView.getProjection();
GeoPoint geoPoint = p.fromPixels((int) ev.getX(), (int) ev.getY());
// You can now pull lat/lng from geoPoint
}
You'll have to manage the LongClick event, and then use the code to find out longitude and latitude with the following code:
GeoPoint geoPoint=mapView.getProjection().fromPixels((int)event.getX(),(int)event.getY());
int latitude = geoPoint.getLatitudeE6();
int longitude = geoPoint.getLongitudeE6();
where 'event' is the object of 'MotionEvent'.
Use any other event according to your case.
It gives latitude and longitude on which point of map click
map.setOnMapClickListener(new OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
//myMap.addMarker(new MarkerOptions().position(point).title(point.toString()));
//The code below demonstrate how to convert between LatLng and Location
//Convert LatLng to Location
Location location = new Location("Test");
location.setLatitude(point.latitude);
location.setLongitude(point.longitude);
location.setTime(new Date().getTime()); //Set time as current Date
txtinfo.setText(location.toString());
//Convert Location to LatLng
LatLng newLatLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions()
.position(newLatLng)
.title(newLatLng.toString());
map.addMarker(markerOptions);
}
});

How to solve this overlay in android?

I am new to Android GPS application development.I have to show multiple location in the map and if user touches any one of the location then it should display the information about that place.Now my problem is i could not able to get the exact location in the touch event.Is there any way to get the exact pointed location of image in the overlay.
The method onTouchEvent is as follow:
public boolean onTouchEvent(MotionEvent event, MapView mapView)
You can retrieve the location of the point with the following:
Projection projection = mapView.getProjection();
GeoPoint g = projection.fromPixels((int)event.getX(),(int)event.getY());
Edit:
This is just an idea. Maybe you can have a look at the doc for ItemizedOverlay, and more particularly
onTap(int index)
I guess you will have to keep track of your overlays in an array and with the index, retrieve the corresponding overlay item
Something like this might be helpful to you?
If you want to get lat and long you can use the GeoPoint tapPoint to get them.
private mapLocation getHitMapLocation(MapView mapView, GeoPoint tapPoint)
{
mapLocation hitMapLocation = null;
RectF hitTestRecr = new RectF();
Point screenCoords = new Point();
Iterator iterator = mapLocationViewer.getMapLocations().iterator();
while(iterator.hasNext()) {
mapLocation testLocation = iterator.next();
mapView.getProjection().toPixels(testLocation.getPoint(), screenCoords);
hitTestRecr.set(-bubbleIcon.getWidth()/2,-bubbleIcon.getHeight(),bubbleIcon.getWidth()/2,0);
hitTestRecr.offset(screenCoords.x,screenCoords.y);
mapView.getProjection().toPixels(tapPoint, screenCoords);
if (hitTestRecr.contains(screenCoords.x,screenCoords.y)) {
pLocation = testLocation;
break; }
}
return hitMapLocation;

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