title: How to refresh a google map manually?
body: <p>I have a marker - creating activity, when the user can customise the position. After this activity is closed I want to put the new, and the ealier saved markers on my google map. (so UPDATE the map)</p>
  
  <p>I am using this function:</p>
  
  <pre><code>onMapReady(GoogleMap googleMap)
  </code></pre>
  
  <p>but it is not working properly. I have to close and reopen the app to see the changes. </p>