How to show multiple markers on MapFragment in Google Map API v2?
I am using Google Map API v2 in my application to show Maps.
I have followed all the steps, that is to be followed to enable Google Map in my application.
public class PinLocationOnMapView extends FragmentActivity {
private double mLatitude = 0.0, mLongitude = 0.0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SupportMapFragment fragment = SupportMapFragment.newInstance();
getSupportFragmentManager().beginTransaction()
.add(android.R.id.content, fragment).commit();
}
}
If I use this code, it shows me map, but if I provide my latitude/longitude values, map tiles does not load, and I see only white tiles.
Following is the code written in onCreate() of above class:
if (getIntent().getExtras() != null) {
final Bundle bundle = getIntent().getBundleExtra("LOCATION");
mLatitude = bundle.getDouble("LATITUDE");
mLongitude = bundle.getDouble("LONGITUDE");
} else {
finish();
}
GoogleMapOptions options = new GoogleMapOptions();
LatLng latLng = new LatLng(mLatitude, mLongitude);
CameraPosition cameraPosition;// = new CameraPosition(latLng, 0, 0, 0);
cameraPosition = CameraPosition.fromLatLngZoom(latLng, (float) 14.0);
options.mapType(GoogleMap.MAP_TYPE_SATELLITE).camera(cameraPosition)
.zoomControlsEnabled(true).zoomGesturesEnabled(true);
SupportMapFragment fragment = SupportMapFragment.newInstance(options);
getSupportFragmentManager().beginTransaction()
.add(android.R.id.content, fragment).commit();
Also, I have a list of lat/long values. I want to show them on MapFragment, how to show multiple markers on MapFragment?
I tried with MapView and ItemizedOverlay, but it didn't work for me. I believe I have correctly created the SHA1 key to get the API key, because if that was wrong, I could not see map using MapFragment as well, but I can see that if I don't pass the lat/log value.
Solution 1:
I do it like this to show car positions on the map with markers of different colors:
private void addMarkersToMap() {
mMap.clear();
for (int i = 0; i < Cars.size(); i++) {
LatLng ll = new LatLng(Cars.get(i).getPos().getLat(), Cars.get(i).getPos().getLon());
BitmapDescriptor bitmapMarker;
switch (Cars.get(i).getState()) {
case 0:
bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED);
Log.i(TAG, "RED");
break;
case 1:
bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN);
Log.i(TAG, "GREEN");
break;
case 2:
bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE);
Log.i(TAG, "ORANGE");
break;
default:
bitmapMarker = BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED);
Log.i(TAG, "DEFAULT");
break;
}
mMarkers.add(mMap.addMarker(new MarkerOptions().position(ll).title(Cars.get(i).getName())
.snippet(getStateString(Cars.get(i).getState())).icon(bitmapMarker)));
Log.i(TAG,"Car number "+i+" was added " +mMarkers.get(mMarkers.size()-1).getId());
}
}
}
Cars is an ArrayList of custom objects and mMarkers is an ArrayList of markers.
Note : You can show map in fragment like this:
private GoogleMap mMap;
....
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the
// map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
// Hide the zoom controls as the button panel will cover it.
mMap.getUiSettings().setZoomControlsEnabled(false);
// Add lots of markers to the map.
addMarkersToMap();
// Setting an info window adapter allows us to change the both the
// contents and look of the
// info window.
mMap.setInfoWindowAdapter(new CustomInfoWindowAdapter());
// Set listeners for marker events. See the bottom of this class for
// their behavior.
mMap.setOnMarkerClickListener(this);
mMap.setOnInfoWindowClickListener(this);
mMap.setOnMarkerDragListener(this);
// Pan to see all markers in view.
// Cannot zoom to bounds until the map has a size.
final View mapView = getSupportFragmentManager().findFragmentById(R.id.map).getView();
if (mapView.getViewTreeObserver().isAlive()) {
mapView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@SuppressLint("NewApi")
// We check which build version we are using.
@Override
public void onGlobalLayout() {
LatLngBounds.Builder bld = new LatLngBounds.Builder();
for (int i = 0; i < mAvailableCars.size(); i++) {
LatLng ll = new LatLng(Cars.get(i).getPos().getLat(), Cars.get(i).getPos().getLon());
bld.include(ll);
}
LatLngBounds bounds = bld.build();
mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 70));
mapView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
});
}
}
And just call setUpMapIfNeeded() in onCreate()
Solution 2:
To add multiple markers to map while converting address (ie. 123 Testing Street Lodi ca) to LatLng using geoCoder, the example code below will work.
// convert address to lng lat and add markers to map
public void addMarkersToMap() {
mMap.clear();
Double[] latitude = new Double[addressArrayList.size()];
Double[] longitude = new Double[addressArrayList.size()];
String[] addrs = new String[addressArrayList.size()];
addrs = addressArrayList.toArray(addrs);
List<Address> addressList;
if (addrs != null && addrs.length > 0) {
for (int i = 0; i < addrs.length; i++) {
try {
addressList = geoCoder.getFromLocationName(addrs[i], 1);
if (addressList == null || addressList.isEmpty() || addressList.equals("")) {
addressList = geoCoder.getFromLocationName("san francisco", 1);
}
latitude[i] = addressList.get(0).getLatitude();
longitude[i] = addressList.get(0).getLongitude();
System.out.println("latitude = " + latitude[i] + " longitude = " + longitude[i]);
mMap.addMarker(new MarkerOptions()
.position(new LatLng(latitude[i], longitude[i]))
.title(namesArrayList.get(i))
.snippet(addressArrayList.get(i))
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE))
.alpha(0.7f)
);
} catch (Exception e) {
e.printStackTrace();
} // end catch
}
}
} //end addMarkersToMap
Solution 3:
I don't know maybe u fixed the code and now it's ok, but in the onCreate()
if (getIntent().getExtras() != null) {
final Bundle bundle = getIntent().getBundleExtra("LOCATION");
mLatitude = bundle.getDouble("LATITUDE");
mLatitude = bundle.getDouble("LONGITUDE");
}
the second mLatitude I think it has to be mLongitude just like u call it in the next rows.
Sorry if I'm late with the answer and is useless.