How to animate marker in android map api V2?

Question

I want to implement smooth transition to emulate car marker moving on the map.

Is it possible to animate marker in android map api v2?

Answer 1

None of versions provided worked for me, so I've implemented my custom solution. It provides both - location and rotation animation.

/**  * Method to animate marker to destination location  * @param destination destination location (must contain bearing attribute, to ensure  *                    marker rotation will work correctly)  * @param marker marker to be animated  */ public static void animateMarker(Location destination, Marker marker) {     if (marker != null) {         LatLng startPosition = marker.getPosition();         LatLng endPosition = new LatLng(destination.getLatitude(), destination.getLongitude());          float startRotation = marker.getRotation();          LatLngInterpolator latLngInterpolator = new LatLngInterpolator.LinearFixed();         ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);         valueAnimator.setDuration(1000); // duration 1 second         valueAnimator.setInterpolator(new LinearInterpolator());         valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {             @Override public void onAnimationUpdate(ValueAnimator animation) {                 try {                     float v = animation.getAnimatedFraction();                     LatLng newPosition = latLngInterpolator.interpolate(v, startPosition, endPosition);                     marker.setPosition(newPosition);                     marker.setRotation(computeRotation(v, startRotation, destination.getBearing()));                 } catch (Exception ex) {                     // I don't care atm..                 }             }         });          valueAnimator.start();     } } 

Rotation computation for specified fraction of animation. Marker is rotated in direction which is closer from start to end rotation:

private static float computeRotation(float fraction, float start, float end) {     float normalizeEnd = end - start; // rotate start to 0     float normalizedEndAbs = (normalizeEnd + 360) % 360;      float direction = (normalizedEndAbs > 180) ? -1 : 1; // -1 = anticlockwise, 1 = clockwise     float rotation;     if (direction > 0) {         rotation = normalizedEndAbs;     } else {         rotation = normalizedEndAbs - 360;     }      float result = fraction * rotation + start;     return (result + 360) % 360; }  

And finally Google's LatLngInterpolator:

private interface LatLngInterpolator {     LatLng interpolate(float fraction, LatLng a, LatLng b);      class LinearFixed implements LatLngInterpolator {         @Override         public LatLng interpolate(float fraction, LatLng a, LatLng b) {             double lat = (b.latitude - a.latitude) * fraction + a.latitude;             double lngDelta = b.longitude - a.longitude;             // Take the shortest path across the 180th meridian.             if (Math.abs(lngDelta) > 180) {                 lngDelta -= Math.signum(lngDelta) * 360;             }             double lng = lngDelta * fraction + a.longitude;             return new LatLng(lat, lng);         }     } }