GrIsHu GrIsHu - 3 months ago 51
Android Question

Google Map v2 Marker Animation

Do anyone have idea how this animation's implementation is possible in google map api v2.
Check out this here.
I would like to know how this is done. Please let me know if anyone have any sample code regarding this.

Thanks in advance.

Answer

I found a solution that worked for me:

final LatLng target = NEW_LOCATION;

final long duration = 400;
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = map.getProjection();

Point startPoint = proj.toScreenLocation(marker.getPosition());
final LatLng startLatLng = proj.fromScreenLocation(startPoint);

final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
    @Override
    public void run() {
        long elapsed = SystemClock.uptimeMillis() - start;
        if (elapsed > duration) {
            elapsed = duration;
        }
        float t = interpolator.getInterpolation((float) elapsed / duration);
        double lng = t * target.longitude + (1 - t) * startLatLng.longitude;
        double lat = t * target.latitude + (1 - t) * startLatLng.latitude;
        marker.setPosition(new LatLng(lat, lng));
        if (t < 1.0) {
            // Post again 10ms later.
            handler.postDelayed(this, 10);
        } else {
            // animation ended
        }
    }
});