我可以将2个cameraUpdate与一个animateCamera一起使用吗？

Question

I am trying to zoom on a map

CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngBounds(mBounds, this.getResources().getDisplayMetrics().widthPixels,
                        height, padding);
mMap.animateCamera(cameraUpdate, duration, null); 

And after that I want to scroll the map vertically

CameraUpdate cameraUpdate =
        CameraUpdateFactory.scrollBy(0, amountToScroll);
    mMap.animateCamera(cameraUpdate, duration, null);

The thing is ... it is not working. If I call the scroll right after the zoom, only the scroll is taken into account. If I scroll the map once the zoom animation is finished I will have 2 animations.

I would like to do both operations with the same animation, is it possible?

Answer 1

If you call animateCamera multiple times, only the last one will finish its action.

The easy fix would be to use moveCamera instead of the first call to animateCamera , but that's not a nice solution from UX perspective.

The other way would be to do the math yourself and fill mBounds with the bounds you really want to show.

Answer 2

The easiest way to do it is to use CancelableCallback. You should check the first action is complete and then call the second:

mMap.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, size.x, height, 0), new CancelableCallback() {

                @Override
                public void onFinish() {
                    CameraUpdate cu_scroll = CameraUpdateFactory.scrollBy(0, 500);
                    mMap.animateCamera(cu_scroll);
                }

                @Override
                public void onCancel() {
                }
            });