Develop Reference

how to rotate google map marker to road direction

I want to rotate marker icon to road direction, as you can see in image it only just placed but its not rotated to road direction.. i've tried below code as far
double lat = 19.205681
double lon = 72.871742
loc.setLatitude(lat);
loc.setLongitude(lon);
Location newLoc = new Location("service Provider");
newLoc.setLongitude(lat);
newLoc.setLongitude(lon);
map.addMarker(new MarkerOptions()
.position(new LatLng(data.getLat(),data.getLon()))
.icon(BitmapDescriptorFactory.fromResource(R.mipmap.ic_pandu_car))
.anchor(0.5f,0.5f)
.rotation(loc.bearingTo(newLoc))
.flat(true));
Note: marker have individual location (ofcource) i dont want to show from-to location bearing ...only individual marker to face on road direction
Thanks you
UPDATE:i wanna set my marker (car) like this Ola app

I have tried your code, first check that is newLoc has bearing or not?
just made some changes as following, you can try it:
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest,
new com.google.android.gms.location.LocationListener() {
#Override
public void onLocationChanged(Location location1) {
if (location1 != null) {
if (currentPositionMarker != null) {
currentPositionMarker.remove();
}
double latitude = location1.getLatitude();
double longitude = location1.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(activity);
if (status == ConnectionResult.SUCCESS) {
currentPositionMarker = googleMap.addMarker(new MarkerOptions().position(latLng)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.current_position))
.rotation(location1.getBearing()).flat(true).anchor(0.5f, 0.5f)
.alpha((float) 0.91));
} else {
GooglePlayServicesUtil.getErrorDialog(status, activity, status);
}
}
}
});

Following code works perfectly fine.
private double radiansToDegrees(double x) {
return x * 180.0 / Math.PI;
}
double fLat = (Math.PI * past.getLatitude()) / 180.0f;
double fLng = (Math.PI * past.getLongitude()) / 180.0f;
double tLat = (Math.PI * next.getLatitude()) / 180.0f;
double tLng = (Math.PI * next.getLongitude()) / 180.0f;
double degree = radiansToDegrees(Math.atan2(sin(tLng - fLng) * cos(tLat), cos(fLat) * sin(tLat) - sin(fLat) * cos(tLat) * cos(tLng - fLng)));
if (degree >= 0) {
bearing = degree;
} else {
bearing = 360 + degree;
}
marker.rotation((float) bearing);

Show closest result of a Geocoder on map

I've been stuck on the problem. i'm searching for Tesco stores in this geocoder. Is there anyway way of getting only the closest result of the geo.getFromLocationName?
private void setUpMap() throws IOException {
Geocoder geo = new Geocoder(getApplicationContext(), Locale.getDefault());
List<Address> addressList= geo.getFromLocationName("Tesco",1);
Address add = addressList.get(0);
String locality = add.getLocality();
double lat = addressList.get(0).getLatitude();
double lng = addressList.get(0).getLongitude();
mMap.addMarker(new MarkerOptions().position(new LatLng(lat,lng)).title("Waitrose"));
}

Modify your method like this:
private void setUpMap() throws IOException {
Geocoder geo = new Geocoder(getApplicationContext(), Locale.getDefault());
List<Address> addressList= geo.getFromLocationName("Tesco",1);
Address yourAddress = // get your location or the address to compare
Address closest = findClosest(addressList, yourAddress);
// do what you need
}
To create the findClosest you have to create a function that iterates over results and use haversine formula to calculate the distance to your location (or the desired one).
public double rad(double x)
{
return x*Math.PI/180.;
}
public Address findClosest( List<Address> addressList, Address yourAddress )
{
double lat = yourAddress.getLatitude(); // your (or desired) latitude
double lng = yourAddress.getLongitude(); // your (or desired) longitude
double R = 6371.; // radius of earth in km
double[] distances = new double[addressList.lenght];
var closest = -1;
for( i=0;i<addressList.lenght; i++ ) {
double mlat = addressList.get(i).getLatitude();
double mlng = addressList.get(i).getLongitude();
double dLat = rad(mlat - lat);
double dLong = rad(mlng - lng);
double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(rad(lat)) * Math.cos(rad(lat)) * Math.sin(dLong/2) * Math.sin(dLong/2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
double d = R * c;
distances[i] = d;
if ( closest == -1 || d < distances[closest] ) {
closest = i;
}
}
return addressList.get(closest);
}

Attempting to sum the distance of an array of LatLng

I'm trying to sum up the total distance between an array of LatLng but failing hard. Here's what I've got so far:
private double sumDistance() {
Location loc = new Location("distance provider");
double previousLatitude;
double previousLongitude;
float[] results = new float[1];
for (LatLng latLng : mMapList) {
previousLatitude = latLng.latitude;
previousLongitude = latLng.longitude;
loc.distanceBetween(previousLatitude, previousLongitude, latLng.latitude, latLng.longitude, results);
}
return 0;
}
The problem with this is that the latlng for both are the same. Is there some way I can get the previous latlng or a cleaner way to do this that I'm not thinking of?

Why don't you assign the "previous variable" after you've calculated the distance? Something like this should work
private double sumDistance() {
Location loc = new Location("distance provider");
double previousLatitude = mMapList.get(0).latitude;
double previousLongitude = mMapList.get(0).longitude;
float[] results;
for (int i=1;i<mMapList.size();i++) {
loc.distanceBetween(previousLatitude, previousLongitude, mMapList.get(i).latitude, mMapList.get(i).longitude, results);
previousLatitude = mMapList[i].latitude;
previousLongitude = mMapList[i].longitude;
}
return 0;
}

double previousLatitude;
double previousLongitude;
float[] results;
for (int i=0; i<mMapList.size(); ++i) {
LatLng latLng = mMapList.get(i);
if (i == 0) {
// Previous weren't set yet, nothing to measure
// Set them and skip loop
previousLatitude = latLng.latitude;
previousLongitude = latLng.longitude;
continue;
}
// Measure previous with current
loc.distanceBetween(previousLatitude, previousLongitude, latLng.latitude, latLng.longitude, results);
// ~ Use the distance
// Modify the previous ones
previousLatitude = latLng.latitude;
previousLongitude = latLng.longitude;
}

method distanceTo(double) is undefined

I have a Problem to get the right way to get the distanceTo from my 2 Geo Points. How to get it work?
from the gps class:
double latitude; // latitude
String mlat;
latitude = location.getLatitude();
mlat = String.valueOf(latitude);
from the ListView:
// Get distance
String mReportA;
double mLocB;
int distance;
mReportA = e.getString("lat");
mReportA = e.getString("lon");
mLocB = gps.latitude;
mLocB = gps.longitude;
distance = mReportA.distanceTo(mLocB);
Error in Eclipse: The method distanceTo(double) is undefined for the type String
I get e.getString("lat"); from json

To calculate distance between two geopoint you can follow the below example.
double currentLatitude = location.getLatitude();
double currentLongitude = location.getLongitude();
double endLatitude = lat;
double endLongitude = lng;
float[] results = new float[3];
Location.distanceBetween(currentLatitude, currentLongitude,endLatitude, endLongitude, results);
BigDecimal bd = new BigDecimal(results[0]);// results in meters
BigDecimal rounded = bd.setScale(2, RoundingMode.HALF_UP);
double values = rounded.doubleValue();
EDIT
if (values > 1000) {
values = (Double) (values * 0.001f);// convert meters to Kilometers
bd = new BigDecimal(values);
rounded = bd.setScale(2, RoundingMode.HALF_UP);
values = rounded.doubleValue();
}

// Here is the code to find out the distance between two locations
float distance;
Location locationA = new Location("A");
locationA.setLatitude(latA);
locationA.setLongitude(lngA);
Location locationB = new Location("B");
locationB.setLatitude(latB);
LocationB.setLongitude(lngB);
distance = locationA.distanceTo(locationB);

{Android App} How can I display distance from my current location and specified point?

i have researched this for hours and the only answers i see point me to
http://developer.android.com/reference/android/location/Location.html
and to use the Method
public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)
i need help understanding how this works in relation to my app. this is how i am retrieving my location.
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager)getSystemService(context);
String provider = LocationManager.GPS_PROVIDER;
Location location = locationManager.getLastKnownLocation(provider);
updateWithNewLocation(location);
}
private void updateWithNewLocation(Location location) {
String latLongString;
TextView myLocationText;
myLocationText = (TextView)findViewById(R.id.myLocationText);
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongString = "Lat:" + lat + "\nLong:" + lng;
} else {
latLongString = "No location found";
}
myLocationText.setText("Your Current Position is:\n" +
latLongString);
}
Can someone please help me out a little in understanding how to import my current location into this equation and then having the distance shown in my app?
thank you

public double calcdist()
{
int MILLION = 1000000;
int EARTH_RADIUS_KM = 6371;
double lat1 = la1 / MILLION;// latitude of location 1
double lon1 = lo1 / MILLION; //longitude of location 1
double lat2 = la2 / MILLION; //latitude of location 2
double lon2 = lo2 / MILLION;//longitude of location 2
double lat1Rad = Math.toRadians(lat1);
double lat2Rad = Math.toRadians(lat2);
double deltaLonRad = Math.toRadians(lon2 - lon1);
double dist = Math.acos(Math.sin(lat1Rad) * Math.sin(lat2Rad) + Math.cos(lat1Rad) * Math.cos(lat2Rad)
* Math.cos(deltaLonRad))
* EARTH_RADIUS_KM;
return dist;
}
You can use this code if you already got latitude and longitude of both the locations.

Create a location listener
Method isAccurateForUse is a custom method that simply checks accuracy of a location.
This should work:
public boolean locChanged = false;
public LocationManager locMgr = null;
public Location referenceL = null; // Your reference location
public Location currentKL = null; // Current known location
public Location currentLKL = null; // Current last known location
//Initialise the GPS listener
locMgr = (LocationManager) appCtx.getSystemService(Context.LOCATION_SERVICE);
locMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, fixGpsListener);
currentLKL = locMgr.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//Define the GPS listener
LocationListener fixGpsListener = new LocationListener()
{
public void onLocationChanged(Location location)
{
locChanged = true;
if (currentKL == null)
currentKL = location;
else if (isAccurateForUse())
{
currentLKL = currentKL;
currentKL = location;
updateDistance(meterToKilometer(currentKL.distanceTo(referenceL)));
}
}
public void onProviderDisabled(String provider)
{}
public void onProviderEnabled(String provider)
{}
public void onStatusChanged(String provider, int status, Bundle extras)
{}
};
currentKL.distanceTo(referenceL) >> gives the distance in meters
meterToKilometer >> converts meters to kilo-meters
updateDistance >> this method takes a string and updates a text-view that shows distance.
Cheers