adding animation to cluster marker?

Question

simple question ... how to add animation to the marker of the cluster before the cluster draw it on the map !? I kept looking but no hope. I just need to know where to start

this is how I add my cluster and how I tried to do the animation

private class AddMarker implements Runnable {
private MarkerOptions options;

public AddMarker(MarkerOptions options) {
    this.options = options;
}

@Override
public void run() {
    MyPoi poi = new MyPoi(options.getPosition());
    mClusterManager.addItem(poi);
    List<Marker> markers = new ArrayList<>();
    markers.addAll(mClusterManager.getMarkerCollection().getMarkers());
    if(markers.size() == 0){

    }else if (markers.size() == 1){
        animateMarker(markers.get(0),Constants.MARKER_ADD);
    }else if(markers.size() > 1){
        animateMarker(markers.get(markers.size()-1),Constants.MARKER_ADD);
    }

    mClusterManager.cluster();
    //Marker newMarker = googleMap.addMarker(options);
    //newMarker.setIcon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
}
}

Answer 1

Here is my solution:

private void setMarkerBounce(Marker marker) {
    for (final com.google.android.gms.maps.model.Marker m : mClusterManager.getMarkerCollection().getMarkers()) {
        if (m.getPosition().equals(marker.getPosition())) {
            final Handler handler = new Handler();
            final long startTime = SystemClock.uptimeMillis();
            final long duration = 2000;
            final Interpolator interpolator = new BounceInterpolator();
            handler.post(new Runnable() {
                @Override
                public void run() {
                    long elapsed = SystemClock.uptimeMillis() - startTime;
                    float t = Math.max(1 - interpolator.getInterpolation((float) elapsed / duration), 0);
                    m.setAnchor(0.5f, 1.0f + t);

                    if (t > 0.0) {
                        handler.postDelayed(this, 16);
                    }
                }
            });
            return;
        }
    }
}

It's a bit ugly, but works fine. You have to pass your custom ClusterItem instance.