private void GetDriverloc(HashMap<String, String> map) {
Call<DriverLocationResToCus> call = apiInterface.GetDriverLoc(map);
System.out.println("enter the currency alert api" + call.request().url());
call.enqueue(new Callback<DriverLocationResToCus>() {
@Override
public void onResponse(Call<DriverLocationResToCus> call, Response<DriverLocationResToCus> response) {
if (response.isSuccessful()) {
assert response.body() != null;
DriverStartLat = response.body().getDriverCurrentLatStart();
DriverStartLng = response.body().getDriverCurrentLngStart();
DriverEndLat = response.body().getDriverCurrentLatEnd();
DriverEndLng = response.body().getDriverCurrentLngEnd();
/这里我从服务器获取驱动程序的位置。我需要将驱动程序 lat lnt 传递给循环并相应地为标记设置动画。我试图将它直接传递给 startpostion 和 endpostion。但标记继续闪烁。
Utilities.printV("DriverStartLat", DriverStartLat);
ValueAnimator polylineAnimator = ValueAnimator.ofInt(0, 100);
polylineAnimator.setDuration(2000);
polylineAnimator.setInterpolator(new LinearInterpolator());
polylineAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
List<LatLng> points = greyPolyLine.getPoints();
int percentValue = (int) valueAnimator.getAnimatedValue();
int size = points.size();
int newPoints = (int) (size * (percentValue / 100.0f));
List<LatLng> p = points.subList(0, newPoints);
blackPolyline.setPoints(p);
}
});
polylineAnimator.start();
mHandler = new Handler();
index = -1;
next = 1;
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (index < points.size() - 1) {
index++;
next = index + 1;
}
if (index < points.size() - 1) {
startPosition = points.get(index);
endPosition = points.get(next);
}
//当我将驱动程序的 lat lng 直接传递到 startposition 和 endposition 时，标记移动到新位置，但如果它没有从服务器获取新的 lat lat 并且持续闪烁，它就会返回。
ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);
valueAnimator.setDuration(3000);
valueAnimator.setInterpolator(new LinearInterpolator());
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
v = valueAnimator.getAnimatedFraction();
lng = v * endPosition.longitude + (1 - v)
* startPosition.longitude;
lat = v * endPosition.latitude + (1 - v)
* startPosition.latitude;
LatLng newPos = new LatLng(lat, lng);
marker.setPosition(newPos);
marker.setAnchor(0.5f, 0.5f);
marker.setRotation(getBearing(startPosition, newPos));
mMap.moveCamera(CameraUpdateFactory
.newCameraPosition
(new CameraPosition.Builder()
.target(newPos)
.zoom(15.5f)
.build()));
}
});
valueAnimator.start();
mHandler.postDelayed(this, 3000);
}
}, 3000);
Utilities.printV("DriverLocationResToCus", "DriverLocationResToCus SUCCESS");
} else {
Utilities.printV("DriverLocationResToCus", "DriverLocationResToCus FAILURE");
}
}
@Override
public void onFailure(Call<DriverLocationResToCus> call, Throwable t) {
}
});
}
//谁能帮我解决这个问题
从以下链接下载 MarkerAnimation 和 LatLngInterpolator 文件
https://drive.google.com/file/d/1i-pDZYOtf-Vl8m6wnYulGnv3rb9aVMih/view https://drive.google.com/file/d/1AypW3b6YIX6UtYFFuh1-lx7Id1lt0QqP/view
或使用下面发布的代码
标记动画代码：
public class MarkerAnimation {
public 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)
public 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();
}
}
LatLngInterpolator 代码：
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)));
}
}
}
这是在地图上旋转图标（标记）的代码位
private float getBearing(LatLng begin, LatLng end) {
double lat = Math.abs(begin.latitude - end.latitude);
double lng = Math.abs(begin.longitude - end.longitude);
if (begin.latitude < end.latitude && begin.longitude < end.longitude)
return (float) (Math.toDegrees(Math.atan(lng / lat)));
else if (begin.latitude >= end.latitude && begin.longitude < end.longitude)
return (float) ((90 - Math.toDegrees(Math.atan(lng / lat))) + 90);
else if (begin.latitude >= end.latitude && begin.longitude >= end.longitude)
return (float) (Math.toDegrees(Math.atan(lng / lat)) + 180);
else if (begin.latitude < end.latitude && begin.longitude >= end.longitude)
return (float) ((90 - Math.toDegrees(Math.atan(lng / lat))) + 270);
return -1;
}
这是从 api 获取 Lat 和 Lng 后需要添加的代码。
if(marker == null) {
marker = mMap.addMarker(new MarkerOptions().position(endPosition)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ROSE)));
MarkerAnimation.animateMarkerToGB(marker, endPosition, new LatLngInterpolator.Spherical());
marker.setRotation(getBearing(endPosition, startPosition));
} else {
MarkerAnimation.animateMarkerToICS(marker, endPosition, new LatLngInterpolator.Spherical());
marker.setRotation(getBearing(endPosition, startPosition));
}
快乐编码:)