Develop Reference

Custom MyPositionIcon On Tap Creates A Copy Of Custom MyPositionMarker

I am trying to replace mMpap.SetMyPosition(true); function with my own. I had some success on it and when my custom image for "My Position Icon" is tapped, it moves camera to current location with my custom marker.
Everything works fine on it except whenever "My Position Icon" is tapped, it leaves a copy of marker to that position and moves to current location with a new marker.
I am fairly new to Android Development and looking for some help.
My code inside onCreate(Bundle savedInstanceState) is:
ImageView img = (ImageView) findViewById(R.id.myPostionButton);
img.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getTheLocation();
}
});
And getTheLocation() is:
if (location != null) {
final double latitude = location.getLatitude();
final double longitude = location.getLongitude();
LatLng latLng = new LatLng(latitude, longitude);
final Marker marker = mMap.addMarker(
new MarkerOptions()
.position(new LatLng(latitude, longitude))
.draggable(true)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_marker)));
mMap.setTrafficEnabled(true);
mMap.setMinZoomPreference(10.0f);
mMap.setMaxZoomPreference(20.0f);
//mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 16.0f),4000 , null);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 16.0f));
mMap.setOnCameraMoveListener(new GoogleMap.OnCameraMoveListener() {
#Override
public void onCameraMove() {
LatLng centerOfMap = mMap.getCameraPosition().target;
marker.setPosition(centerOfMap);
}
});
mMap.setOnCameraIdleListener(new GoogleMap.OnCameraIdleListener() {
#Override
public void onCameraIdle() {
LatLng centerOfMap = mMap.getCameraPosition().target;
marker.setPosition(centerOfMap);
double latitude = centerOfMap.latitude;
double longitude = centerOfMap.longitude;
Geocoder geocoder = new Geocoder(getApplicationContext());
try {
List<Address> addressList = geocoder.getFromLocation(latitude, longitude, 1);
String str = addressList.get(0).getAddressLine(0) + ", ";
str += addressList.get(0).getSubLocality() + ", ";
str += addressList.get(0).getLocality() + ", ";
str += addressList.get(0).getCountryCode();
mFromAddress.setText(str);
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
And onMapReady(GoogleMap googleMap) is:
mMap = googleMap;
getTheLocation();
Please Help.

You can try any one of the following based on your situation:
1. If you have only one marker in map, before adding the new marker, clear the map using mMap.clear();
2. If you have multiple markers then you have to keep your current marker object as member variable mMarker. Then just before adding the new marker you can use mMarker.remove();.

getFromLocationName alwayd return empty address

I'm a bit confused, I'm trying to retrieve Latitude / Longitude from an adress, I retrieved some code from previous posts but whatever the address I'm filling in the getFromLocationName method, I'm always having an empty string in return.
here is the code I'm using:
public void onMapReady(GoogleMap map) {
LatLng coord = getLocationFromAddress(getBaseContext(), fullAdr);
.....
.....
public LatLng getLocationFromAddress(Context context, String strAddress)
{
Geocoder coder= new Geocoder(context);
List<Address> address;
LatLng p1 = null;
try
{
if(!coder.isPresent()) {
Log.d("JRE","There is no GeoCoder !");
return new LatLng(0,0);
}
address = coder.getFromLocationName(strAddress, 5);
if(address==null)
{
return null;
}
Address location = address.get(0);
location.getLatitude();
location.getLongitude();
p1 = new LatLng(location.getLatitude(), location.getLongitude());
}
catch (Exception e)
{
e.printStackTrace();
}
return p1;
}
any idea why I'm getting always empty values ?
Thanks.

No address showing on map click Android Google maps

Ive added reverse Geocoding to my map and set the map to clickable. Everything works as it should except the address is not showing above the marker when i click the map.
my latLan is an array but thats the only way it would allow me to use the variable. i think the problem lies around this area but cant put my hand on it.
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID); // changes view to hybrid
mMap.setMyLocationEnabled(true); // shows location on map
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); // uses GPS only to get location
double currentLatitude = location.getLatitude();
double currentLongitude = location.getLongitude();
final LatLng[] latLng = {(new LatLng(currentLatitude, currentLongitude))};
mMap.animateCamera(
CameraUpdateFactory.newLatLngZoom(latLng[0], 18)); // This will zoom camera to updated lat and long without constant updates
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {// Setting a click event handler for the map
#Override
public void onMapClick(LatLng arg0) {
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); // uses GPS only to get location
double currentLatitude = location.getLatitude();
double currentLongitude = location.getLongitude();
//LatLng latLng;
// Getting the Latitude and Longitude of the touched location
latLng[0] = arg0;
// Clears the previously touched position
mMap.clear();
// Animating to the touched position
mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng[0]));
// Creating a marker
markerOptions = new MarkerOptions();
// Setting the position for the marker
markerOptions.position(latLng[0]);
// Placing a marker on the touched position
mMap.addMarker(markerOptions);
// Adding Marker on the touched location with address
new ReverseGeocodingTask(getBaseContext()).execute(latLng[0]);
}
});
//new ReverseGeocodingTask(getBaseContext()).execute(latLng);
}
private class ReverseGeocodingTask extends AsyncTask<LatLng, Void, String> {
Context mContext;
public ReverseGeocodingTask(Context context) {
super();
mContext = context;
}
#Override
protected String doInBackground(LatLng... params) {
Geocoder geocoder = new Geocoder(mContext);
double latitude = params[0].latitude;
double longitude = params[0].longitude;
List<android.location.Address> addresses = null;
String addressText = "";
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1);
} catch (IOException e) {
e.printStackTrace();
}
if (addresses != null && addresses.size() > 0) {
android.location.Address address = addresses.get(0);
addressText = String.format("%s, %s, %s", address.getMaxAddressLineIndex() > 0 ?
address.getAddressLine(0) : "", address.getLocality(), address.getCountryName());
}
return addressText;
}
#Override
protected void onPostExecute(String addressText) {
markerOptions.title(addressText);
mMap.addMarker(markerOptions);
}
}
}

Tested your code and found possible cause of error.
// Placing a marker on the touched position
mMap.addMarker(markerOptions);
Upon implementing addMarker() before doing the ReverseGeocodingTask() and calling addMarker() again in the onPostExecute(). You can try adding an custom marker image large enough to make the address and the overwriting marker visible.
Customize the marker image
You can replace the default marker image with a custom marker image, often called an icon. Custom icons are always set as a BitmapDescriptor, and defined using one of four methods in the BitmapDescriptorFactory class.
Code for custom image:
private static final LatLng MELBOURNE = new LatLng(-37.813, 144.962);
private Marker melbourne = mMap.addMarker(new MarkerOptions()
.position(MELBOURNE)
.title("Melbourne")
.snippet("Population: 4,137,400")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow)));
You can remove the first mMap.addMarker(markerOptions); before new ReverseGeocodingTask(getBaseContext()).execute(latLng[0]); then it your app will work as it should be.

Use This Code May be work for getting Address
if (addresses != null && addresses.size() > 0) {
Address address = addresses.get(0);
String addressLine = address.getAddressLine(0) + address.getAddressLine(1) + address.getAddressLine(2) + address.getAddressLine(3);
}

Location within 100 km using Google Maps within Android

I am working on an Android application and Google Maps in which I am searching for the particular address by using the following code. I want to get the location of the searched address if it is in 100km within my location, and if it outside that limit, it will not show me.
I am trying to get the searched location within my 100km radius.
private class GeocoderTask extends AsyncTask<String, Void, List<Address>>{
#Override
protected List<Address> doInBackground(String... locationName) {
// Creating an instance of Geocoder class
Geocoder geocoder = new Geocoder(getBaseContext());
List<Address> addresses = null;
try {
//
//24.798406, 54.790448
//25.452403, 55.537519
// Getting a maximum of 3 Address that matches the input text
addresses = geocoder.getFromLocationName(locationName[0], 10,
24.861969, 54.857740,25.545368, 55.474347);//.getFromLocationName(locationName[0], 3);
} catch (IOException e) {
e.printStackTrace();
}
return addresses;
}
#Override
protected void onPostExecute(List<Address> addresses) {
if(addresses==null || addresses.size()==0){
Toast.makeText(getBaseContext(), "No Location found", Toast.LENGTH_SHORT).show();
}
// Clears all the existing markers on the map
mMap.clear();
// Adding Markers on Google Map for each matching address
for(int i=0;i<addresses.size();i++){
Address address = (Address) addresses.get(i);
LatLng latLng;
// Creating an instance of GeoPoint, to display in Google Map
latLng = new LatLng(address.getLatitude(), address.getLongitude());
String addressText = String.format("%s, %s",
address.getMaxAddressLineIndex() > 0 ? address.getAddressLine(0) : "",
address.getCountryName());
markerOptions = new MarkerOptions();
markerOptions.position(latLng);
// markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.flag));
markerOptions.title(addressText);
mMap.addMarker(markerOptions);
// Locate the first location
if(i==0)
mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
}
}
}

You can calculate distance using this code; here, distance is in meters. You can call this function and check where the location is in the range or not.
private boolean checkForArea(int rad, LatLng fromPosition, LatLng toPosition) {
Location locationA = new Location("point A");
locationA.setLatitude(fromPosition.latitude);
locationA.setLongitude(fromPosition.longitude);
Location locationB = new Location("point B");
locationB.setLatitude(toPosition.latitude);
locationB.setLongitude(toPosition.longitude);
int distance = (int) locationA.distanceTo(locationB);
if (distance / 1000 <= rad)
return true;
else
return false;
}

How to zoom to a country by name in an Android application

How to zoom to a country by name in an Android application(google map)? IF I get a coutry name Ireland then the map location to the Ireland

1 Get location by country name
Geocoder geocoder = new Geocoder(<your context>);
List<Address> addresses;
addresses = geocoder.getFromLocationName(<String address>, 1);
if(addresses.size() > 0) {
double latitude= addresses.get(0).getLatitude();
double longitude= addresses.get(0).getLongitude();
}
2 Zoom to current location
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lng), 10));

You can use the Geocoder API to fetch the location based on the country name and then animate the map camera to that position:
try {
List<Address> address = new Geocoder(this).getFromLocationName("Ireland", 1);
if (address == null) {
Log.e(TAG, "Not found");
} else {
Address loc = address.get(0);
Log.e(TAG, loc.getLatitude() + " " + loc.getLongitude());
LatLng pos = new LatLng(loc.getLatitude(), loc.getLongitude())
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(pos, 14));
}
} catch (IOException e) {
e.printStackTrace();
}