zoom level listener in google maps v2 in android

Question

I'm developing an Android app that is supposed to use Google Maps v2. Now i'm stuck at finding when zoom level of map has changed. Can anyone help me?Thanks in advance.

Answer 1

If you're looking for how to determine if the zoom level has changed from the previous zoom level, here's what I'd suggest:

Define an instance variable to keep track of the previous zoom level:

//Initialize to a non-valid zoom value private float previousZoomLevel = -1.0f; 

Also, define an instance variable to let you know if the map is zooming:

private boolean isZooming = false; 

When you setup your GoogleMap instance, give it an OnCameraChangeListener...

//mMap is an instance of GoogleMap mMap.setOnCameraChangeListener(getCameraChangeListener()); 

Now, define the OnCameraChangeListener that will determine if the zoom level has changed:

public OnCameraChangeListener getCameraChangeListener() {     return new OnCameraChangeListener()      {         @Override         public void onCameraChange(CameraPosition position)          {             Log.d("Zoom", "Zoom: " + position.zoom);              if(previousZoomLevel != position.zoom)             {                 isZooming = true;             }              previousZoomLevel = position.zoom;         }     }; } 

Now, you can check the value of isZooming to know if you are changing zoom levels.

Make sure to set

isZooming = false; 

after you've completed whatever action relies on knowing if the map is zooming.

Answer 2

Since previous answers are based on OnCameraChangeListener and that is deprecated, this answer is based on camera OnCameraMoveListener.

In this example, I am changing my Map Type when user changes the zoom (using controls or fingers and zooming).

If zoom level changes to above 18.0, map type changes to MAP_TYPE_HYBRIB and
If zoom level changes to below 18.0, map type changes to MAP_TYPE_NORMAL.

googleMap.setOnCameraMoveListener(new GoogleMap.OnCameraMoveListener() {     @Override     public void onCameraMove() {         CameraPosition cameraPosition = googleMap.getCameraPosition();         if(cameraPosition.zoom > 18.0) {             googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);         } else {             googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);         }     } });