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以下のコードから私は地図上にマーカーを追加しています.15秒ごとにデータベースから新しい緯度と経度を取得しています。マーカー（バス画像）が地図上に追加され、道路が車に乗っているようにある位置から別の位置にスムーズに移動しています。今私が望むことは、バスマーカーを方向に沿って回転させたいということです。どうすればこれを達成できますか？私はtoRotationとstの価値は何か分かっていないのですか？方向に応じてマーカー（バス）を回転させる方法は？
public Runnable runLocation = new Runnable() {
@Override
public void run() {
gps = new GPSTracker(MapActivity.this);
MyLocation1.clear();
if (gps.CanGetLocation()) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
LatLng mylocation = new LatLng(latitude, longitude);
if (marker != null) {
marker.remove();
}
if (circle != null) {
circle.remove();
}
if (busMarker != null){
lastBusPos = busMarker.getPosition();
}
marker = mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.location))
.title("My Location")
.position(mylocation));
circle = mMap.addCircle(new CircleOptions()
.center(mylocation)
.radius(1000)
.strokeColor(0x10000000)
.fillColor(0x10000000));
} else {
// gps.showSettingsAlert();
}
String tag_json_obj = "json_obj_req";
String url = AppConfig.RouteData + "i=1&" + "y=1";
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject jObj = new JSONObject(String.valueOf(response));
JSONArray json_user = jObj.getJSONArray("Message");
for (int i = 0; i < json_user.length(); i++) {
try {
JSONObject obj = json_user.getJSONObject(i);
final Double currLat = obj.getDouble("actual_lat");
final Double currLong = obj.getDouble("actual_long");
final LatLng hcmus = new LatLng(currLat, currLong);
List<LatLng> latList = new ArrayList<LatLng>();
latList.add(hcmus);
if (mMarkers.size() != json_user.length()) {
busMarker = mMap.addMarker(new MarkerOptions()
.icon(BitmapDescriptorFactory.fromResource(R.drawable.bus))
.title("Bus No" + obj.getString("bus_id"))
.position(hcmus));
mMarkers.add(busMarker);
} else {
//busMarker.setPosition(hcmus);
animateMarker(hcmus, false);
rotateMarker(busMarker, 45.0f, 45.0f);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MapActivity.this, "Sorry something went wrong..Try again", Toast.LENGTH_SHORT).show();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj);
MapActivity.this.handler.postDelayed(MapActivity.this.runLocation, 15000);
}
};
/*-------------------------------Animation----------------------------*/
public void rotateMarker(final Marker marker, final float toRotation, final float st) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
final float startRotation = st;
final long duration = 1555;
final Interpolator interpolator = new LinearInterpolator();
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 16ms later.
handler.postDelayed(this, 16);
}
}
});
}
public void animateMarker(final LatLng toPosition,final boolean hideMarke) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = mMap.getProjection();
Point startPoint = proj.toScreenLocation(lastBusPos);
final LatLng startLatLng = proj.fromScreenLocation(startPoint);
final long duration = 5000;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable() {
@Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed
/duration);
double lng = t * toPosition.longitude + (1 - t)
* startLatLng.longitude;
double lat = t * toPosition.latitude + (1 - t)
* startLatLng.latitude;
busMarker.setPosition(new LatLng(lat, lng));
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
} else {
if (hideMarke) {
busMarker.setVisible(false);
} else {
busMarker.setVisible(true);
}
}
}
});
}
/*--------------------------------------------------------------------*/