强制animateCamera完成动画

Question

I'm trying to force the camera to animate to a zoom level and coordinate that describes as precisely as possible the area occupied by a list of LatLng coordinates.

So far, I have the following:

private void focusListOfCoords(Collection<LatLng> coords) {
  LatLngBounds.Builder coordsBoundsBuilder = new LatLngBounds.Builder();
  for (LatLng coord : coords) {
    coordsBoundsBuilder.include(coord);
  }
  LatLngBounds coordsBounds = coordsBoundsBuilder.build();
  CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngBounds(coordsBounds, 50);
  mMap.animateCamera(cameraUpdate);
}

The code above, when zoomed all the way out on the whole world simply pans the view slightly to center on the center point of the bounds. It does not zoom in.

If I replace mMap.animateCamera(cameraUpdate) with mMap.moveCamera(cameraUpdate) , the projection changes the zoom level (too far in every case, but that's beside the point) and centers as expected.

After trying to troubleshoot this, I noticed that if I implement the CancelableCallback for the animateCamera method, I can see that the animation is being cancelled.

Is there a way to force the animation to finish? If not, how can I hunt down the cause of the animation being cancelled?

Edit : The solution can be found in this question: Android- animateCamera with CameraUpdateFactory.newCameraPosition does NOT zoom

To summarize, my listener method that was calling the animation was returning false which cancelled the animation.

Answer 1

You can try to use a different approach to your implementation.

One is passing CameraUpdateFactory.newLatLngZoom(latlng, zoom) to animateCamera . You can specify the zoom level using this. More info on that here .

Or you can build your CameraView first before passing it to animateCamera . You can check out the docs here .

Not really sure why or how it is trigerring onCancel() . Maybe something is being fired right after your animateCamera call. Try to use the duration parameter to alter the speed of the animation and check for changes.