How to get center of map for v2 android maps?

Question

In Google Maps for Android v1, MapView had a convenience method: getMapCenter(). Now I cannot figure out how to get map center with v2 of this api. I have perused the API documentation, but there is no mention of such a feature. Please advise.

Thanks, Igor

score 202 · Accepted Answer · edited Dec 11 '15 at 18:54

202

I had the same problem. It seems you can get the center this way:

mMap.getCameraPosition().target

where mMap is the GoogleMap instance from your activity. This will return a LatLng object which basically represents the center of the map.

Note that the GeoPoint class is not available anymore.

According to http://developer.android.com/reference/com/google/android/gms/maps/model/CameraPosition.html

target is "The location that the camera is pointing at." (I tested it with the sample code and it worked okay for me)

edited Dec 11 '15 at 18:54

Sam Hanley

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answered Dec 18 '12 at 11:34

Radu Comaneci

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1

Thanks, I didn't realize that GeoPoint was unavailable in v2. I was gonna use the VisibleRegion object to calculate the middle point between the four corners of the map display. – IgorGanapolsky Dec 19 '12 at 18:52
@Radu Comaneci How to do the same with html javascript? Any idea – Ankesh kumar Jaisansaria Oct 23 '16 at 13:17
Good answer, but this gets affected if im using a padding for example to move the copyright google sign, so the center of the map will get this padding value as well – sdelvalle57 Mar 16 '18 at 10:59

score 35 · Answer 2 · answered May 19 '13 at 22:51

35

I have found two ways of do this:

1) The easiest, The first is using the target property in the Map's CameraPosition Object

 LatLng center = mMap.getCameraPosition().target;

2) The second is using a VisibleRegion object:

VisibleRegion visibleRegion = mMap.getProjection()
                    .getVisibleRegion();

Point x = mMap.getProjection().toScreenLocation(
                    visibleRegion.farRight);

Point y = mMap.getProjection().toScreenLocation(
                    visibleRegion.nearLeft);

Point centerPoint = new Point(x.x / 2, y.y / 2);

LatLng centerFromPoint = mMap.getProjection().fromScreenLocation(
                    centerPoint);

I have compared both answers:

Log.d("MapFragment: ", "Center From camera: Long: " + center.longitude
                        + " Lat" + center.latitude);

Log.d("Punto x", "x:" + x.x + "y:" + x.y);
Log.d("Punto y", "y:" + y.x + "y:" + y.y);

Log.d("MapFragment: ", "Center From Point: Long: "
                    + centerFromPoint.longitude + " Lat"
                    + centerFromPoint.latitude);

answered May 19 '13 at 22:51

shontauro

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Option 2 gives a completely different answer for me than option 1. Maybe because I have a transparent Toolbar? Thanks for the tip! – Flyingkiwi Mar 04 '15 at 17:51
3

so which method is accurate? – Abdullah Shoaib Nov 03 '15 at 05:11
@shontauro How to do the same with html javascript? Any idea – Ankesh kumar Jaisansaria Oct 23 '16 at 13:17
1

javascript no idea. – shontauro Oct 24 '16 at 02:40
Option 2 Gave a more accurate position. Thanks – Amit Arora Apr 07 '23 at 10:46

score 15 · Answer 3 · edited May 04 '18 at 11:44

15

You can use :

latlng=map.getProjection().getVisibleRegion().latLngBounds.getCenter();

edited May 04 '18 at 11:44

linktoahref

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answered Feb 24 '16 at 19:04

AAP

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Get the accuracy with this solution – VVB Apr 22 '19 at 12:54

score 7 · Answer 4 · answered Dec 11 '15 at 19:07

to get center of map I used onMapReady() method in activity, then used googleMap.setOnCameraChangeListener() method to get position of Came:

@Override
public void onMapReady(GoogleMap googMap) {
    googleMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
        @Override
        public void onCameraChange(CameraPosition cameraPosition) {

       Log.i("centerLat",cameraPosition.target.latitude);

       Log.i("centerLong",cameraPosition.target.longitude);

        }
    });
}

score 5 · Answer 5 · answered Sep 17 '18 at 13:06

If you only want to get the position once (e.g. after the user has stopped panning the map), use setOnCameraIdleListener:

https://developers.google.com/android/reference/com/google/android/gms/maps/GoogleMap.OnCameraIdleListener

mMap.setOnCameraIdleListener(new GoogleMap.OnCameraIdleListener() {
    @Override
    public void onCameraIdle() {
        LatLng position = mMap.getCameraPosition().target;
        Log.d("MapActivity", "Position: " + position);
    }
});

or using a Java 8 lambda:

mMap.setOnCameraIdleListener(() -> {
    LatLng position = mMap.getCameraPosition().target;
    Log.d("MapActivity", "Position: " + position);
});

Note that the listener registered with setOnCameraChangeListener is called many times, and as the documentation states:

This may be called as often as once every frame and should not perform expensive operations.

score 3 · Answer 6 · answered Sep 22 '18 at 13:34

3

best way use cameraPosition

java:

LatLng centerMap = googleMap.getCameraPosition().target;

kotlin:

googleMap?.cameraPosition?.target?.let {
    // it is LatLng center
}

answered Sep 22 '18 at 13:34

Rasoul Miri

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How to get center of map for v2 android maps?

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