public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
MyItem myItem;
private ClusterManager<MyItem> mClusterManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(31.530136,74.353225), 10));
// Initialize the manager with the context and the map.
// (Activity extends context, so we can pass 'this' in the constructor.)
mClusterManager = new ClusterManager<MyItem>(this, mMap);
// Point the map's listeners at the listeners implemented by the cluster
// manager.
mMap.setOnCameraChangeListener(mClusterManager);
mMap.setOnMarkerClickListener(mClusterManager);
// Add cluster items (markers) to the cluster manager.
// addItems();
myItem = new MyItem(31.530136,74.353225);
mClusterManager.addItem(myItem);
myItem = new MyItem(31.529807, 74.352495);
mClusterManager.addItem(myItem);
myItem = new MyItem(31.530584, 74.353729);
mClusterManager.addItem(myItem);
myItem = new MyItem(31.531319, 74.351217);
mClusterManager.addItem(myItem);
// Add a marker in Sydney and move the camera
// LatLng sydney = new LatLng(-34, 151);
// mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
// mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
private void addItems() {
// Set some lat/lng coordinates to start with.
double lat = 31.531034;
double lng = 74.352374;
// Add ten cluster items in close proximity, for purposes of this example.
for (int i = 0; i < 10; i++) {
double offset = i / 60d;
lat = lat + offset;
lng = lng + offset;
MyItem offsetItem = new MyItem(lat, lng);
mClusterManager.addItem(offsetItem);
}
}
}
Above class represents the code to add marker coordinates in cluster utility library offered by Google maps in android. But when I run the code it gives the error at mClustermanager.addItem() gives null pointer exception.
