我已经按照这个答案并且成功了。https://dev59.com/S1sV5IYBdhLWcg3w-i-l#37048987
但是我现在面临的问题是:
在
- 当我停在任何位置时,它不稳定。即使我没有移动,我也会得到随机方位值。
- 当我转弯时,它是逆时针旋转的,这是错误的。它应该转短弯。
private double bearingBetweenLocations(LatLng latLng1,LatLng latLng2) {
double PI = 3.14159;
double lat1 = latLng1.latitude * PI / 180;
double long1 = latLng1.longitude * PI / 180;
double lat2 = latLng2.latitude * PI / 180;
double long2 = latLng2.longitude * PI / 180;
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(y, x);
brng = Math.toDegrees(brng);
brng = (brng + 360) % 360;
return brng;
}
private void rotateMarker(final Marker marker, final float toRotation) {
if(!isMarkerRotating) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
final float startRotation = marker.getRotation();
final long duration = 2000;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
@Override
public void run() {
isMarkerRotating = true;
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed / duration);
float rot = t * toRotation + (1 - t) * startRotation;
float bearing = -rot > 180 ? rot / 2 : rot;
marker.setRotation(bearing);
CameraPosition camPos = CameraPosition
.builder(mMap.getCameraPosition())
.bearing(bearing)
.target(marker.getPosition())
.build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(camPos));
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
} else {
isMarkerRotating = false;
}
}
});
}
}
在
onLocationChanged()
方法中float toRotation = (float) bearingBetweenLocations(toLatLng(oldLocation), toLatLng(newLocation));
rotateMarker(my_marker, toRotation);