Animating Markers

1MarkerAnimation.java

/* Copyright 2013 Google Inc.
   Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0.html */

package com.example.latlnginterpolation;

import android.animation.ObjectAnimator;
import android.animation.TypeEvaluator;
import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Handler;
import android.os.SystemClock;
import android.util.Property;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Interpolator;

import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;

public class MarkerAnimation {
    static void animateMarkerToGB(final Marker marker, final LatLng finalPosition, final LatLngInterpolator latLngInterpolator) {
        final LatLng startPosition = marker.getPosition();
        final Handler handler = new Handler();
        final long start = SystemClock.uptimeMillis();
        final Interpolator interpolator = new AccelerateDecelerateInterpolator();
        final float durationInMs = 3000;

        handler.post(new Runnable() {
            long elapsed;
            float t;
            float v;

            @Override
            public void run() {
                // Calculate progress using interpolator
                elapsed = SystemClock.uptimeMillis() - start;
                t = elapsed / durationInMs;
                v = interpolator.getInterpolation(t);

                marker.setPosition(latLngInterpolator.interpolate(v, startPosition, finalPosition));

                // Repeat till progress is complete.
                if (t < 1) {
                    // Post again 16ms later.
                    handler.postDelayed(this, 16);
                }
            }
        });
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    static void animateMarkerToHC(final Marker marker, final LatLng finalPosition, final LatLngInterpolator latLngInterpolator) {
        final LatLng startPosition = marker.getPosition();

        ValueAnimator valueAnimator = new ValueAnimator();
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float v = animation.getAnimatedFraction();
                LatLng newPosition = latLngInterpolator.interpolate(v, startPosition, finalPosition);
                marker.setPosition(newPosition);
            }
        });
        valueAnimator.setFloatValues(0, 1); // Ignored.
        valueAnimator.setDuration(3000);
        valueAnimator.start();
    }

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
    static void animateMarkerToICS(Marker marker, LatLng finalPosition, final LatLngInterpolator latLngInterpolator) {
        TypeEvaluator<LatLng> typeEvaluator = new TypeEvaluator<LatLng>() {
            @Override
            public LatLng evaluate(float fraction, LatLng startValue, LatLng endValue) {
                return latLngInterpolator.interpolate(fraction, startValue, endValue);
            }
        };
        Property<Marker, LatLng> property = Property.of(Marker.class, LatLng.class, "position");
        ObjectAnimator animator = ObjectAnimator.ofObject(marker, property, typeEvaluator, finalPosition);
        animator.setDuration(3000);
        animator.start();
    }
}

2LatLngInterpolator.java

/* Copyright 2013 Google Inc.
   Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0.html */

package com.example.latlnginterpolation;

import com.google.android.gms.maps.model.LatLng;

import static java.lang.Math.asin;
import static java.lang.Math.atan2;
import static java.lang.Math.cos;
import static java.lang.Math.pow;
import static java.lang.Math.sin;
import static java.lang.Math.sqrt;
import static java.lang.Math.toDegrees;
import static java.lang.Math.toRadians;

public interface LatLngInterpolator {
    public LatLng interpolate(float fraction, LatLng a, LatLng b);

    public class Linear implements LatLngInterpolator {
        @Override
        public LatLng interpolate(float fraction, LatLng a, LatLng b) {
            double lat = (b.latitude - a.latitude) * fraction + a.latitude;
            double lng = (b.longitude - a.longitude) * fraction + a.longitude;
            return new LatLng(lat, lng);
        }
    }

    public 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);
        }
    }

    public class Spherical implements LatLngInterpolator {

        /* From github.com/googlemaps/android-maps-utils */
        @Override
        public LatLng interpolate(float fraction, LatLng from, LatLng to) {
            // http://en.wikipedia.org/wiki/Slerp
            double fromLat = toRadians(from.latitude);
            double fromLng = toRadians(from.longitude);
            double toLat = toRadians(to.latitude);
            double toLng = toRadians(to.longitude);
            double cosFromLat = cos(fromLat);
            double cosToLat = cos(toLat);

            // Computes Spherical interpolation coefficients.
            double angle = computeAngleBetween(fromLat, fromLng, toLat, toLng);
            double sinAngle = sin(angle);
            if (sinAngle < 1E-6) {
                return from;
            }
            double a = sin((1 - fraction) * angle) / sinAngle;
            double b = sin(fraction * angle) / sinAngle;

            // Converts from polar to vector and interpolate.
            double x = a * cosFromLat * cos(fromLng) + b * cosToLat * cos(toLng);
            double y = a * cosFromLat * sin(fromLng) + b * cosToLat * sin(toLng);
            double z = a * sin(fromLat) + b * sin(toLat);

            // Converts interpolated vector back to polar.
            double lat = atan2(z, sqrt(x * x + y * y));
            double lng = atan2(y, x);
            return new LatLng(toDegrees(lat), toDegrees(lng));
        }

        private double computeAngleBetween(double fromLat, double fromLng, double toLat, double toLng) {
            // Haversine's formula
            double dLat = fromLat - toLat;
            double dLng = fromLng - toLng;
            return 2 * asin(sqrt(pow(sin(dLat / 2), 2) +
                    cos(fromLat) * cos(toLat) * pow(sin(dLng / 2), 2)));
        }
    }
}

@vimlesh and @Swavis
The same is happening to me. The animation is fine for a couple of seconds, then it starts stuttering

same problem here, any solution?

Is this copyrighted code? Code java files has mentioned licensed.

/* Copyright 2013 Google Inc. Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0.html */

@saumilsdk you can use this code as long as you follow the license terms of the Apache 2.0 license linked there. The code is copyrighted by Google, yes.

To everyone else: please post your question via the Android community channels or Google Maps API channels https://developers.google.com/maps/support