How to show a radius in maps android? - android

I have a eight different Longitude and latitude values in that any one value have longitude and latitude and remaining wont have values in that case I have to show a radius for that one value. Can anyone help me to solve this problem.
Thanks

GoogleMap has method addCircle so your just need to call it with appropriate params:
GoogleMap map;
MarkerOptions markerOptions = new MarkerOptions();
LatLng position = new LatLng(50, 50);
markerOptions.position(position);
Marker marker = map.addMarker(markerOptions);
Circle circle = map.addCircle(
new CircleOptions()
.center(position)
.radius(100)
.strokeWidth(0f)
.fillColor(getActivity().getResources().getColor(R.color.someColor))
);

Related

How to retrieve latitude and longitude of Google Maps android

How can I retrieve latitude and longitude of Google Maps data from my database and display it to the user on the map in android ?
I have a database mysql containing some fields as longitude and latitude.
What is the best way to do such?
Is it possible through a Volley library?
If there is an example of this, it is good to me
Yes you can draw stuff in the onMapReady callback. You can create Markers, draw circles, draw polygons.
To add a marker just call:
LatLng point = new LatLng(exampleLat, exampleLng);
mGoogleMap.addMarker(new MarkerOptions().position(point));
Here is an example of how to draw a circle:
CircleOptions circleOptions = new CircleOptions()
.center(new LatLng(lat, lng))
.radius(radius)
.fillColor(Color.RED)
.strokeColor(Color.TRANSPARENT);
Circle circle = mGoogleMap.addCircle(circleOptions);
Here is a Polygon:
PolygonOptions polygonalOptions = new PolygonOptions()
.fillColor(Color.RED)
.strokeColor(Color.TRANSPARENT)
.clickable(true);
for (List<Double> latLng : myPolygon.path) {
LatLng point = new LatLng(latLng.get(0), latLng.get(1));
polygonalOptions.add(point);
}
mGoogleMap.addPolygon(polygonalOptions);
PS: Writing from my phone sorry for any mistakes or formatting issues.

Android Google Map showing multiple markers on current location

Hello everyone I am using custom marker image in google map. My problem is that when i click on that marker or zoom in or zoom out this marker duplicates means, more markers appears on the same location on different points. why this happening? how to avoid it?
Thanks in advance.
Code
#Override
public void onLocationChanged(Location location)
{
TextView tvLocation = (TextView) findViewById(R.id.tv_location);
// Getting latitude of the current location
latitude = location.getLatitude();
// Getting longitude of the current location
longitude = location.getLongitude();
// Creating a LatLng object for the current location
LatLng latLng = new LatLng(latitude, longitude);
// Showing the current location in Google Map
googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// Zoom in the Google Map
googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
// Setting latitude and longitude in the TextView tv_location
tvLocation.setText("Latitude:" + latitude + ", Longitude:"+ longitude );
MarkerOptions markerOptions = new MarkerOptions();
// Setting position for the marker
markerOptions.position(latLng);
// Setting custom icon for the marker
// markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.compass_needle));
// Setting title for the infowindow
// Adding the marker to the map
googleMap.addMarker(markerOptions);
// markerOptions.rotation(260);
}
You are adding markers but you are not clearing previous added loation marker so You have to clear previously added marker when Location is changed again.
Add this line above googleMap.addMarker(markerOptions);
googleMap.clear();
googleMap.addMarker(markerOptions);
I hope it helps!
More correct is to remove a specific marker, and don't clear the whole map.
Because you can have others markers and polylines on map.
In your case you have only one marker showing user location.
You can get it when adding.
private Marker mLocationMarker;
public void onLocationChanged(Location location) {
...
if(mLocationMarker != null) {
mLocationMarker.remove();
}
mLocationMarker = googleMap.addMarker(markerOptions);
}

android detect various circles on a map v2

In my little app I have a map and i'm parsing an XML from the web, like this:
<place>
<lat>42.827602</lat>
<lon>-1.663957</lon>
<place_name>Place one</place_name>
<snippet>Snippet de place Facebook</snippet>
<thumb>http://www.animage.com/myicon1.png</thumb>
</place>
<place>
<lat>42.830750</lat>
<lon>-1.669064</lon>
<place_name>Place two</place_name>
<snippet>Snippet de place Twitter</snippet>
<thumb>http://www.animage.com/myicon2.png</thumb>
</place>
<place>
<lat>42.825333</lat>
<lon>-1.668232</lon>
<place_name>Place Three</place_name>
<snippet>Snippet de place Skype</snippet>
<thumb>http://www.animage.com/myicon3.png</thumb>
</place>
</response>
every time I read a "place" from the xml, the onPostExecute of my AsyncTask, calls the method that creates a new marker and circle on the map of my application
For example, if the xml has seven "places", the method to create a new marker and a circle is called seven times.
Marker aMarker;
Circle aCircle;
//...
public void createNewMarkerAndCircle() {
//...
aMarker = mMap.addMarker(new MarkerOptions()
.position(new LatLng(dLat, dLon))
.title(nombre_punto)
.snippet(introduccion_punto)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
aCircle = mMap.addCircle(new CircleOptions()
.center(new LatLng(dLat, dLon))
.radius(150)
.strokeColor(Color.RED)
}
//...
public void onPostExecute(String xml) {
xml = stringBuffer.toString();
try {
Document doc = parser.getDomElement(xml);
NodeList nl0 = doc.getElementsByTagName(KEY_PLACE);
Element e = (Element) nl0.item(lap);
theLat = parser.getValue(e, KEY_LATITUDE);
theLon = parser.getValue(e, KEY_LONGITUDE);
//...
createNewMarkerAndCircle();
//...
So far, everything works fine and markers and circles are created on the map.
My purpose is that when the user on the map comes within the radius of one of the circles, get the datas of the marker that is inside.
I show you what I'm doing:
I have a listener of my location that every time it´s updated, check the distance from the current location and radius of the circle.
GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
#Override
public void onMyLocationChange(Location location) {
LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());
float[] distance = new float[2];
try {
Location.distanceBetween(
location.getLatitude(),
location.getLongitude(),
aCircle.getCenter().latitude,
aCircle.getCenter().longitude, distance);
if (distance[0] > aCircle.getRadius()) {
Log.i("myLogs", "Outside");
} else {
String markerTitle;
markerTitle = aMarker.getTitle();
Log.i("myLogs", "I´ in the circle" + " " + markerTitle);
}
//....
This works fine, but with a big problem.
When I start to walk the route, only detected when I go into the last "place" parsed from xml, and therefore, the last marker and circle created.
I understand what the problem is, the last marker (Marker aMarker;) and circle (Circle aCircle;) created are those with the values assigned ... But i do not know how to fix it.
I would appreciate any help, several days ago I'm looking for solutions, but without success.
Thanks and regards.
More information:
I found this other way , but the problem remains exactly the same:
https://gist.github.com/saxman/5347195
the last marker (Marker aMarker;) and circle (Circle aCircle;)
created are those with the values assigned ... But i do not know how
to fix it.
In order to check the distance against all the points of interests you create you need to hold them in some sort of structure, the most simple being a list, to reference them later in the listener:
Marker aMarker;
Circle aCircle;
// this will hold the circles
List<Circle> allCircles = new ArrayList<Circle>();
// this will hold the markers
List<Marker> allMarkers = new ArrayList<Marker>();
public void createNewMarkerAndCircle() {
aMarker = mMap.addMarker(new MarkerOptions()
.position(new LatLng(dLat, dLon))
.title(nombre_punto)
.snippet(introduccion_punto)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE )));
// store the new marker in the above list
allMarkers.add(aMarker);
aCircle = mMap.addCircle(new CircleOptions()
.center(new LatLng(dLat, dLon))
.radius(150)
.strokeColor(Color.RED)
// store the created circles
allCircles.add(aCircle);
}
// in the LocationListener iterate over all stored circles and check the distances against each one of them
// as you add the circles and markers in the same method you'll have a correspondence between them in the two lists
// another sensible approach would be to create a custom Area class
// to hold both the Marker and the circle in one single place
// so when you find yourself inside a circle the marker will be at the same position in allMarkers
for (int i = 0; i < allCircles.size(); i++) {
Circle c = allCircles.get(i);
Location.distanceBetween(location.getLatitude(), location.getLongitude(), c.getCenter().latitude, c.getCenter().longitude, distance);
if (distance[0] > c.getRadius()) {
Log.i("myLogs", "Outside");
} else {
String markerTitle;
markerTitle = allMarkers.get(i).getTitle();
Log.i("myLogs", "I´ in the circle" + " " + markerTitle);
// you found a circles so you may want to break out of the for loop, break;
}
GeofencingApi was created exactly for this purpose: https://developer.android.com/reference/com/google/android/gms/location/GeofencingApi.html
I think you make mistake createNewMarkerAndCircle(), Please make MarkerOptions and Circle local else when update map only last instance of show, that is reason that only last circle show.
public void createNewMarkerAndCircle() {
//...
MarkerOptions aMarker = mMap.addMarker(new MarkerOptions()
.position(new LatLng(dLat, dLon))
.title(nombre_punto)
.snippet(introduccion_punto)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
Circle aCircle = mMap.addCircle(new CircleOptions()
.center(new LatLng(dLat, dLon))
.radius(150)
.strokeColor(Color.RED)
}

Showing multiple markers in google map v2

i have a set of lat long coordinates. i want to display all of those markers at a time on google map. I know how to display a single marker. But don't know how to display multiples at once. Anybody please help me.
Thank you.
i have lat long points.
like
id = 123 lat = 12.00 lon = 77.00
id = 124 lat = 12.01 lon = 77.01
etc.
May This Help You
for(int pin=0; pin<pins.size(); pin++)
{
LatLng pinLocation = new LatLng(Float.parseFloat(pins.get(pin).latitude), Float.parseFloat(pins.get(pin).longitude));
Marker storeMarker = map.addMarker(new MarkerOptions()
.position(pinLocation)
.title(pins.get(pin).pinname)
.snippet(pins.get(pin).address)
);
}
Try this:
LatLng one = new LatLng(2.40744, 77.014702);//Latitude and long points
LatLng two = new LatLng(2.407440, 77.014702);
.......
Similarly u can use more lat and long
myMarkerOne = gm.addMarker(new MarkerOptions()
.position(one)//use LatLng obj
.title("C")
.snippet("dsfd")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));
myMarkerTwo = gm.addMarker(new MarkerOptions()
.position(two)
.title("C")
.snippet("dsfds")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));
refer this: How to add multiple marker and overlay in v2 google map?
Also check this link:
Create a LatLng object by using following format:
LatLng location = new LatLng(latitude, longitude);
Then call the method with your LatLng object along with your GoogleMap object:
private Marker setCurrentLocation(LatLng location, GoogleMap map) {
BitmapDescriptor bitmapDescriptor = BitmapDescriptorFactory
.fromResource(R.drawable.user_location_pin);
Marker marker = map.addMarker(new MarkerOptions().position(location)
.icon(bitmapDescriptor).title(location.toString()));
return marker;
}

Google map markers are disappearing instantly. How to make a marker remain constant?

I am adding markers on my map by fetching user locations stored in the remote server. The locations are displayed but within 3 seconds, the marker disappears. Any solution to this?? Below is my complete code.
protected void onPostExecute(Void result)
{
super.onPostExecute(result);
for(Users u:locList)
{
MarkerOptions markerOptions = new MarkerOptions();
double latitude1 = u.getLatitude();
double longitude1 = u.getLongitude();
LatLng latLng1 = new LatLng(latitude1, longitude1);
// Animating to the touched position
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng1));
if(userMarker!=null) userMarker.remove();
markerOptions = new MarkerOptions().position(new LatLng(latitude1, longitude1)).title(latLng1.toString());
// adding marker
userMarker = mGoogleMap.addMarker(markerOptions);
//userMarker.setVisible(true);
// Placing a marker on the touched position
mGoogleMap.addMarker(markerOptions);
markerOptions.visible(true);
}
}
please check your code do you use something like map.clear()
remove
userMarker.remove();
from your code...
I fixed the same issue by commenting out map.clear. Wow correct my grammar way to go get a life

Categories

Resources