title: How to create activity which should not destroy if I go back to previous activity
body: <p>I wanted to create view like what's app call page. If I use other <code>fragments</code> or activity this page should not destroy. If I destroy activity by pressing some button then only it should call destroy function. I am not understanding how this feature is working. For this feature should I use Activity or <code>fragment</code> or something else. </p>