Opening InfoWindow automatically when adding marker Google Maps v2 Android

Solution 1:

According to the documents of Google Maps for Android V2:

An info window allows you to display information to the user when they tap on a marker on a map. By default, an info window is displayed when a user taps on a marker if the marker has a title set. Only one info window is displayed at a time. If a user clicks on another marker, the current window will be hidden and the new info window will be displayed. You can show an info window programmatically by calling showInfoWindow() on the target marker. An info window can be hidden by calling hideInfoWindow().

You can show the info window like this:

Marker marker = myMap.addMarker(new MarkerOptions()
                     .position(latLng)
                     .title("Title")
                     .snippet("Snippet")
                     .icon(BitmapDescriptorFactory
                     .fromResource(R.drawable.marker)));

marker.showInfoWindow();