如何在Android中的地图活动中放大标记

Question

Hi I wanted to know how I can slowly zoom in on a marker in a map activity in android. Currently my app just opens zoomed in on the marker. I would like it to zoom in slowly when the app is opened.

This is my current code

LatLng mark = new LatLng(21.197384, 6.369441);
mMap.addMarker(new MarkerOptions().position(mark).title("Marker for Mark"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(mark));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mark, zoomLevel));

Answer 1

Use mMap.animateCamera instead of mMap.moveCamera

Also, you can control the duration of the movement using

animateCamera (CameraUpdate update, int durationMs, GoogleMap.CancelableCallback callback)

In your example, change

mMap.moveCamera(CameraUpdateFactory.newLatLng(mark));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mark, zoomLevel));

for

mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mark, zoomLevel));

or, if you want the movement to last 200ms:

mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mark, zoomLevel), 200, null);

Answer 2

Try mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(mark, zoomLevel)); instead of

mMap.moveCamera(CameraUpdateFactory.newLatLng(mark));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mark, zoomLevel));

Answer 3

In this way you can achieve this --

CameraUpdate center= CameraUpdateFactory.newLatLng(new LatLng(latitude_origin, longitude_origin));
CameraUpdate zoom = CameraUpdateFactory.newLatLngZoom(new LatLng(latitude_origin, longitude_origin),3);
  googleMap.animateCamera(center);
  googleMap.animateCamera(zoom);

Hope this helps!