Google maps - keep center when zooming

Question

In Google Maps, I would like to be able to keep the center of the map on a marker on my location when I'm zooming in or out. It's something that Ingress does, it doesn't matter where you double tap (or double click) or where you pinch, the map remains centered on your marker. So it's possible...

The best I came up with for now is :

google.maps.event.addListener(mymap, 'zoom_changed', function() {
    mymap.setCenter({lat: myLoc.lat, lng: myLoc.lon});
})

But it's far from perfect, it just re-center the map after the user already zoomed...

Thanks a lot !

[EDIT] absolutely nothing helps in the API ref... Or elsewhere I'm blind and missed it !

Answer 1

Purely using Javascript

• First you disable scroll zoom function by default of google map by scrollwheel=false,
• Next create custom scroll zoom function by capture mouse event and set zoom level for google map

Check my sample code: Fiddle URL: https://jsfiddle.net/vh3gqop0/17/

var map, i = 12;
function initialize() {
		var myLatlng = new google.maps.LatLng(46.769603, 23.589957);
		var mapOptions = {
			center: myLatlng,
			zoom: i,
			scrollwheel: false,
  		disableDoubleClickZoom: true,
			mapTypeId: google.maps.MapTypeId.ROADMAP
		};
		map = new google.maps.Map(document.getElementById("map_canvas"),
			mapOptions);

		var marker = new google.maps.Marker({
			position: myLatlng,
			map: map,
			title: 'Any Title'
		});


	}

google.maps.event.addDomListener(window, 'load', initialize);

$( document ).ready(function() {
    $('#map_canvas').on("wheel", function(evt){
   // console.log(evt.originalEvent.deltaY);
    		if(evt.originalEvent.deltaY > 0){
        	map.setZoom(++i);
        }else {
        	map.setZoom(--i);
        }
    		
    });
});

#map_canvas{
    height:400px;
    width:100%;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<div id="map_canvas"></div>

Answer 2

I have no idea why you tagged this question as both Javascript and Android. On Android you need to wrap your MapView inside another view and detect Double Tap motion inside onInterceptTouchEvent which you can override if your class can override FrameLayout for example. Then return true to prevent the map from handling this event and you handle it instead.

For full code please see my answer here: https://stackoverflow.com/a/30118649/764897