This method works even well with multiple markers. get the title of the marker using marker.getTitle() and Starts the activity based on which marker you clicked.
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng chennai = new LatLng(12.9671, 80.2593);
mMap.addMarker(new MarkerOptions().position(chennai).title("Chennai"));
LatLng perungudi = new LatLng(12.97, 80.25);
mMap.addMarker(new MarkerOptions().position(perungudi).title("Perungudi"));
LatLng pallikarnai = new LatLng(12.9377, 80.2154);
mMap.addMarker(new MarkerOptions().position(pallikarnai).title("Pallikarnai"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(chennai,12));
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
if (marker.getTitle().equals("Chennai")){
Toast.makeText(MapsActivity.this, "Clicked"+marker.getTitle(), Toast.LENGTH_SHORT).show();
}
return false;
}
});
}