Set position in a map by long pressing. Used in Android, google maps v2.

longPress.java

// set position by long press
        mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
            @Override
            public void onMapLongClick(LatLng latLng) {
                // First check if myMarker is null
                if (myManualPositionMarker == null) {
                    // Marker was not set yet. Add marker:
                    myManualPositionMarker = mMap.addMarker(new MarkerOptions()
                            .position(latLng)
                            .title("My positions")
                            .snippet("Your marker snippet"));
                } else {
                    // Marker already exists, just update it's position
                    myManualPositionMarker.setPosition(latLng);
                }

                myManualPositionMarker.setIcon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
            }
        });