Show path between 2 place in google map in ionic 2.
In src/index.html set your google map api key.
<script src="http://maps.googleapis.com/maps/api/js?v=3.28&key=YOUR_API_KEY"></script>
If your net connecting is slow then increase the timeout here.
Resource: https://developers.google.com/maps/documentation/javascript/examples/directions-complex