title: How to replace a Fragment on button click of that fragment?
body: <p>I have an activity containing multiple fragments. Activity initially have fragment and in it have two buttons. Upon clicking this button I have to replace the fragment by new fragment. Each fragment has various widgets and replace the current fragment as various events.</p>
  
  <p>This is my problem. How can I achieve this?</p>
  
  <p>Suggest me ideas.</p>