Animate a car(Marker) along a path in google map a

问题:

I am going to share a solution of moving a marker along the path if you have List.The Bitmap will move along the path from using LatLng list.

回答1:

public static void setAnimation(GoogleMap myMap, final List<LatLng> directionPoint, final Bitmap bitmap) {


    Marker marker = myMap.addMarker(new MarkerOptions()
            .icon(BitmapDescriptorFactory.fromBitmap(bitmap))
            .position(directionPoint.get(0))
            .flat(true));

    myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(directionPoint.get(0), 10));

    animateMarker(myMap, marker, directionPoint, false);
}


private static void animateMarker(GoogleMap myMap, final Marker marker, final List<LatLng> directionPoint,
                                  final boolean hideMarker) {
    final Handler handler = new Handler();
    final long start = SystemClock.uptimeMillis();
    Projection proj = myMap.getProjection();
    final long duration = 30000;

    final Interpolator interpolator = new LinearInterpolator();

    handler.post(new Runnable() {
        int i = 0;

        @Override
        public void run() {
            long elapsed = SystemClock.uptimeMillis() - start;
            float t = interpolator.getInterpolation((float) elapsed
                    / duration);
            if (i < directionPoint.size())
                marker.setPosition(directionPoint.get(i));
            i++;


            if (t < 1.0) {
                // Post again 16ms later.
                handler.postDelayed(this, 16);
            } else {
                if (hideMarker) {
                    marker.setVisible(false);
                } else {
                    marker.setVisible(true);
                }
            }
        }
    });
}

回答2:

I'm also done with this same scenario, here given that code.

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, LocationListener {

private static Location oldLocation;
private GoogleMap mMap;
private LocationManager locationManager;
private Marker marker;
private static float angle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        Toast.makeText(this, "Location permissioin in not enable", Toast.LENGTH_SHORT).show();
        return;
    }
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2, 0, this);
    mapFragment.getMapAsync(this);
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
}

@Override
public void onLocationChanged(Location location) {
    locationUpdate(location);
    if (oldLocation != null) {
        double bearing = angleFromCoordinate(oldLocation.getLatitude(), oldLocation.getLongitude(), location.getLatitude(), location.getLongitude());
        changeMarkerPosition(bearing);
    }
    oldLocation = location;
}

private void locationUpdate(Location location) {
    LatLng latLng = new LatLng((location.getLatitude()), (location.getLongitude()));
    MarkerOptions markerOptions = new MarkerOptions();
    markerOptions.position(latLng);
    markerOptions.title("Current Position");
    markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.car_right));
    mMap.clear();
    marker = mMap.addMarker(markerOptions);
    CameraPosition position = CameraPosition.builder()
            .target(new LatLng(location.getLatitude(), location.getLongitude()))
            .zoom(19)
            .tilt(30)
            .build();
    mMap.animateCamera(CameraUpdateFactory.newCameraPosition(position));
}

private void changeMarkerPosition(double position) {
    float direction = (float) position;
    Log.e("LocationBearing", "" + direction);

    if (direction==360.0){
        //default
        marker.setRotation(angle);
    }else {
        marker.setRotation(direction);
        angle=direction;
    }
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}


private double angleFromCoordinate(double lat1, double long1, double lat2,
                                   double long2) {
    double dLon = (long2 - long1);

    double y = Math.sin(dLon) * Math.cos(lat2);
    double x = Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1)
            * Math.cos(lat2) * Math.cos(dLon);

    double brng = Math.atan2(x, y);

    brng = Math.toDegrees(brng);
    brng = (brng + 360) % 360;
    brng = 360 - brng;
    return brng;
}}

hope this helpful.