How to Center The Camera So That Marker Is at The Bottom of Screen? (Google Map API V2 Android)

How to center the camera so that marker is at the bottom of screen? (Google map api V2 Android)

I might edit this answer later to provide some code, but what I think could work is this:

1. Get LatLng (LatLng M) of the clicked marker.
2. Convert LatLng M to a Point (Point M) using the Projection.toScreenLocation(LatLng) method. This gives you the location of the marker on the device's display (in pixels).
3. Compute the location of a point (New Point) that's above Point M by half of the map's height.
4. Convert the New Point back to LatLng and center the map on it.

Look here for my answer on how to get the map's height.

    // googleMap is a GoogleMap object
    // view is a View object containing the inflated map
    // marker is a Marker object
    Projection projection = googleMap.getProjection();
    LatLng markerPosition = marker.getPosition();
    Point markerPoint = projection.toScreenLocation(markerPosition);
    Point targetPoint = new Point(markerPoint.x, markerPoint.y - view.getHeight() / 2);
    LatLng targetPosition = projection.fromScreenLocation(targetPoint);
    googleMap.animateCamera(CameraUpdateFactory.newLatLng(targetPosition), 1000, null);

centering the camera in Google Maps V2

After reading some additional docs, I found that the following code worked...

    CameraPosition cameraPosition = new CameraPosition.Builder()
        .target(new LatLng(Lat, Lon))
        .zoom(15)
        .bearing(0)
        .tilt(45)
        .build();
    map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
    map.addMarker(new MarkerOptions()
    .position(new LatLng(Lat, Lon))
    .title("Phone Location")
        );  

I think my original code should have also worked.
Gary

Center android google map on group of markers?

You can animate your camera within specific bounds. Let's say you have an ArrayList of markers, something like (this could also be a list of LatLngs, doubles, anything that contains the latitude/longitude for your marker)

List<MarkerOptions> markers = new ArrayList<MarkerOptions>();

You can then make sure they are all visible on your map by doing the following

LatLngBounds.Builder builder = new LatLngBounds.Builder();
LatLng position;
for(int i = 0; i < markers.size(); i++){
    position = markers.get(i).getPosition();
    builder.include(new LatLng(position.latitude, position.longitude));
}
LatLngBounds bounds = builder.build();
map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 15));

Google Map API V2 - How do I keep a marker in the center of the screen while user is scrolling the map?

I do not think that you can actually keep a marker in the middle of the screen and float it easily. My suggestion is to trick your user. Add your marker image onto the map like a button. you can place it in the middle of the screen using the xml layout. Then when your user selects a location just retrieve the gps coordinates from the middle of the screen.

On a side note you could also just make your marker draggable Then the user could drag it around the map.

mMap.addMarker(new MarkerOptions().position(coordinate)
                    .title("Your Title")
                    .snippet("Please move the marker if needed.")
                    .draggable(true)); 

How to keep the map marker in the center of the screen at all times? Android

Don't use a real marker. Put the MapFragment or MapView in a layout with a fake marker image centered over it. When the location is chosen, place a real marker and hide the fake one.

If the "pointy end" of the fake marker image is not in its exact center, simply pad the image with transparent space until it is.

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