From http://androidsysteme.blogspot.ie/2015/05/placepicker-activity-doesnt-call.html

new_gist_file_0

if (requestCode == 5 && resultCode == RESULT_OK) {
    Toast.makeText(this,"here",Toast.LENGTH_SHORT).show();
    if (data != null) {
        Place place = PlacePicker.getPlace(data, this);
        if (place != null) {
            lat = place.getLatLng().latitude;
            lng = place.getLatLng().longitude;
            MarkerOptions marker = new MarkerOptions().position(
                    place.getLatLng()).title("Hello Maps"); marker.icon(BitmapDescriptorFactory
                    .defaultMarker(BitmapDescriptorFactory.HUE_RED));
                  googleMap.addMarker(marker);
        } else{
            Toast.makeText(this,"place",Toast.LENGTH_SHORT).show();
            MarkerOptions marker = new MarkerOptions().position(
                    new LatLng(latitude, longitude)).title("Hello Maps");
            lat = latitude;
            lng = longitude;
            // Changing marker icon
            marker.icon(BitmapDescriptorFactory
                    .defaultMarker(BitmapDescriptorFactory.HUE_ROSE));

            // adding marker
            googleMap.addMarker(marker);
        }
    } else{
        Toast.makeText(this,"data",Toast.LENGTH_SHORT).show();
        MarkerOptions marker = new MarkerOptions().position(
                new LatLng(latitude, longitude)).title("Hello Maps");
        lat = latitude;
        lng = longitude;
        // Changing marker icon
        marker.icon(BitmapDescriptorFactory
                .defaultMarker(BitmapDescriptorFactory.HUE_ROSE));

        // adding marker
        googleMap.addMarker(marker);
    }