zoom level listener in google maps v2 in android
Solution 1
Create an implementation of OnCameraChangeListener
, and pass an instance of it to setOnCameraChangeListener()
of your GoogleMap
. Your listener should be called with onCameraChange()
whenever the user changes the zoom, center, or tilt. You find out the new zoom level from the CameraPosition
object that you are passed.
Solution 2
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.
Solution 3
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);
}
}
});
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Khikmat
Updated on July 08, 2021Comments
-
Khikmat almost 3 years
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.
-
Piotr Miller almost 8 yearsAlso works perfectly as a drag listener. Exactly what I was looking for to filter markers view by the distance to the map center. Thanks!
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Makalele over 7 yearssetOnCameraChangeListener is now deprecated
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John Ward over 7 yearsNice! Much cleaner than OnCameraChangeListener. Interesting idea to change the map type.
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Someone Somewhere over 6 yearsnote: this callback is triggered quite a few times for each zoom event
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ᴛʜᴇᴘᴀᴛᴇʟ over 6 years@SomeoneSomewhere Yes, it is. While user is zooming in, each "phase" of the zoom will have a trigger. The slower you zoom in/out, the more times it will trigger the listener. The faster you zoom in/out, the less times it will trigger.
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Zaid Mirza over 6 yearsdeprecated now.
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Nirmal Prajapat about 6 years@CommonsWare what if I want to detect only zoom onDoubleTap on google map??
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CommonsWare about 6 years@NirmalPrajapat: I have no idea, sorry.
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M. Massula about 2 yearsAs is deprecated, use
onCameraMoveStarted
instead