I am trying to create a Uber like app. The bus marker is showing on map but I want to move the marker and rotate smoothly when the bus turn left or right on road. I called the rotateBusMarker(dl, false) function. The findDriverLocation() function retrieve the data from firebase and shows the bus marker on map. My code is given below.
private final HashMap<String, Marker> hm = new HashMap<String, Marker>();
private void findDriverLocation() {
DatabaseReference ref = FirebaseDatabase.getInstance().getReference("DrvUserLocation");
ValueEventListener listener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot ds: dataSnapshot.getChildren()){
if (ds.exists()) {
String dNum = ds.child("drvMobN").getValue(String.class);
double lat = ds.child("Latitude").getValue(Double.class);
double lng = ds.child("Longitude").getValue(Double.class);
LatLng dl = new LatLng(lat, lng);
if(hm.containsKey(dNum)) {
hm.get(dNum).remove();
}
busMarker = mMap.addMarker(new MarkerOptions().position(dl).title(dNum).icon(BitmapDescriptorFactory.fromResource(R.drawable.bus_icon)));
hm.put(dNum, busMarker);
rotateBusMarker(dl, false);
} else {
Toast.makeText(StdMapsActivity.this, "Latitude and Longitude Value Not Found!.", Toast.LENGTH_SHORT).show();
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(StdMapsActivity.this, "Failed to get data.", Toast.LENGTH_SHORT).show();
}
};
ref.addValueEventListener(listener);
}
public void rotateBusMarker(final LatLng toPosition, final boolean hideMarker) {
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = mMap.getProjection();
Point startPoint = proj.toScreenLocation(busMarker.getPosition());
final LatLng startLatLng = proj.fromScreenLocation(startPoint);
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);
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;
busMarker.setPosition(new LatLng(lat, lng));
busMarker.setRotation(bearing);
if (t < 1.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
} else {
if (hideMarker) {
busMarker.setVisible(false);
} else {
busMarker.setVisible(true);
}
}
}
});
}
