title: How to trigger a function when a user goes back to a background app?
body: <p>For example, an user opens an app, presses the home button, and then comes back to the app again.</p>
  
  <p>Is there any way to trigger certain functions when the user navigates back to the app? Such as auto load a view object when the user is back to the app.</p>
  
  <p>This question is for both Android &amp; iOS.</p>