我正在尝试创建一个像ola/uber这样的应用程序。我想移动图标并在道路向左或向右转时旋转。我正在使用以下代码。
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 = 1000;
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;
marker.setRotation(-rot > 180 ? rot / 2 : rot);
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
} else {
isMarkerRotating = false;
}
}
});
}
}
要计算方位角：
currentLocation = location;
if(previousLocaton!=null){
previousLocaton = tempLocation;
tempLocation = currentLocation;
Log.d("previousLocaton=====> ",""+previousLocaton);
Log.d("currentLocation=====> ",""+currentLocation);
bearing = previousLocaton.bearingTo(currentLocation) ;
}else{
previousLocaton = location;
tempLocation = location;
}
要设置方位角：
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(latLng).zoom(14).bearing(bearing).build();
为了旋转标记，我在更改的方法中调用 roateMarker 方法onLocationChanged：
currLocationMarker = mMap.addMarker(markerOptions);
rotateMarker(currLocationMarker,bearing);
现在我的图标正在旋转。但谷歌地图也会旋转。我只想旋转图标。我参考以下链接进行动画处理并移动标记。链接 1.请让我有任何想法来解决我的问题。
有
一个简单的方法可用于标记
marker.rotation(float value)
设置标记绕标记锚点顺时针旋转的度数。旋转轴垂直于标记。旋转 0 对应于标记的默认位置。当标记在地图上平坦时，默认位置为北对齐，并且旋转使标记在地图上始终保持平坦。当标记是广告牌时，默认位置指向上方，旋转使得标记始终面向摄像机。默认值为 0。
要使用setRotation(float)方法仅旋转标记设置旋转到标记。
static public void rotateMarker(final Marker marker, final float toRotation) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
final float startRotation = marker.getRotation();
final long duration = 1000;
final Interpolator interpolator = new LinearInterpolator();
L.d("Bearing: "+toRotation);
handler.post(new Runnable() {
@Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed / duration);
float rot = t * toRotation + (1 - t) * startRotation;
marker.setRotation(-rot > 180 ? rot / 2 : rot);
if (t < 1.0) {
// Post again 10ms later.
handler.postDelayed(this, 10);
}
}
});
}
试试这个：
public void animateMarker(final LatLng toPosition, final LatLng startLatLng,
final boolean hideMarker) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = map.getProjection();
Point startPoint = proj.toScreenLocation(d_marker.getPosition());
final LatLng startLatLng = proj.fromScreenLocation(startPoint);
// final CameraPosition newcameraPosition = null;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
@Override
public void run() {
Location prevLoc = new Location("service Provider");
prevLoc.setLatitude(startLatLng.latitude);
prevLoc.setLongitude(startLatLng.longitude);
Location newLoc = new Location("service Provider");
newLoc.setLatitude(toPosition.latitude);
newLoc.setLongitude(toPosition.longitude);
System.out.println("Locations ---- " + prevLoc + "-" + newLoc);
float bearing = prevLoc.bearingTo(newLoc);
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed
/ 1000);
double lng = t * toPosition.longitude + (1 - t)
* startLatLng.longitude;
double lat = t * toPosition.latitude + (1 - t)
* startLatLng.latitude;
d_marker.setPosition(new LatLng(lat, lng));
d_marker.setRotation(bearing);
d_marker.setFlat(true);
// googleMap.moveCamera(CameraUpdateFactory.newCameraPosition(newcameraPosition));
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
} else {
if (hideMarker) {
d_marker.setVisible(false);
} else {
d_marker.setVisible(true);
}
}
}
});
}
尝试以下方法：
public void animateMarker(final LatLng toPosition,
final boolean hideMarker) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = googleMap.getProjection();
Point startPoint = proj.toScreenLocation(cabMarker.getPosition());
final LatLng startLatLng = proj.fromScreenLocation(startPoint);
// final CameraPosition newcameraPosition = null;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
@Override
public void run() {
Location prevLoc = new Location("service Provider");
prevLoc.setLatitude(startLatLng.latitude);
prevLoc.setLongitude(startLatLng.longitude);
Location newLoc = new Location("service Provider");
newLoc.setLatitude(toPosition.latitude);
newLoc.setLongitude(toPosition.longitude);
System.out.println("Locations ---- " + prevLoc + "-" + newLoc);
float bearing = prevLoc.bearingTo(newLoc);
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed
/ 1000);
double lng = t * toPosition.longitude + (1 - t)
* startLatLng.longitude;
double lat = t * toPosition.latitude + (1 - t)
* startLatLng.latitude;
cabMarker.setPosition(new LatLng(lat, lng));
cabMarker.setRotation(bearing);
// googleMap.moveCamera(CameraUpdateFactory.newCameraPosition(newcameraPosition));
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
} else {
if (hideMarker) {
cabMarker.setVisible(false);
} else {
cabMarker.setVisible(true);
}
}
}
});
}