Develop Reference

How to clear Google map v2 except few markers?

Suppose i have 100 markers on the map what i want is when i apply GoogleMap.clear(); to clear the map it clear all the other markers on the map except 2 markers and 1 polyline between them a path.
say
marker1 = GoogleMap .addMarker(new MarkerOptions().position(latLng1).title(A));
marker2 = GoogleMap .addMarker(new MarkerOptions().position(latLng2).title(B));
line = GoogleMap.addPolyline(options1);
I don't want to clear these three. I want this so user don't have to experience a blink.

There is no way to clear everything except some things. However, you can keep a reference to any markers that you want to clear and loop over them.
ArrayList<Marker> markersToClear = new ArrayList<Marker>();
marker1 = GoogleMap.addMarker(new MarkerOptions().position(latLng1).title(A));
marker2 = GoogleMap.addMarker(new MarkerOptions().position(latLng2).title(B));
marker3 = GoogleMap.addMarker(new MarkerOptions().position(latLng3).title(C));
markersToClear.add(marker2);
markersToClear.add(marker3);
for (Marker marker : markersToClear) {
marker.remove();
}
markersToClear.clear();
// marker1 left on map

Create Marker but not show it on the map

I would like to know how I can create a Marker but not to show on the map, I'm saving the Markers in an array but it is showing me on the map, this is my code
if (c4!= null ) {
if (c4.moveToFirst()) {
do {
LatLng posicion = new LatLng(
Double.parseDouble(c4.getString(0)),
Double.parseDouble(c4.getString(1)));
punto = googleMap.addMarker(new MarkerOptions() .position(posicion)
.title(c4.getString(2))
.snippet(year)
.anchor(0.5f, 0.5f));
mMarkers.add(punto);
}while (c4.moveToNext());
}
}
I've tried and used this
MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude));
but this does not work for me as I need to be type Marker.
Anyone know how could i save spots without paint on the map? thank you very much and sorry for my bad English :)

Try using:
punto = googleMap.addMarker(new MarkerOptions() .position(posicion)
.title(c4.getString(2))
.snippet(year)
.anchor(0.5f, 0.5f).visible(false));
instead of
punto = googleMap.addMarker(new MarkerOptions() .position(posicion)
.title(c4.getString(2))
.snippet(year)
.anchor(0.5f, 0.5f));
Notice the .visible(false) part.
For further info regarding the same refer: http://developer.android.com/reference/com/google/android/gms/maps/model/MarkerOptions.html

save the markers in this list
List<Marker> markers = new ArrayList<Marker>();
markers.add(marker); // here the marker is of google map
Then afterwords use Clear() on your google map so that the markers that got add should be deleted
EDIT=
Also you can separately remove a single marker by
marker.remove();
you can also try to save the latitude and longitude in array list and then later as you like it, show them through marker.

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

How to show the title of a MarkerOptions Marker on a Map?

I add some markers to a map like this:
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(new LatLng(foo.lat, foo.lon)).title(foo.name);
mMap.addMarker(markerOptions);
How to show the title of a Marken then on the map, like when a user clicks on it?

mMap.addMarker() returns a marker using that marker object you can try forcing the InfoWindow open using
marker.showInfoWindow();