title: How to Handle backPress with Fragment
body: <p>i have Fragment Activity With contatin navigation drawer.after clicking navigation drawer item it open a Fragment 1, fragment 2, Fragment 3.and then after button click event in Fragment 1 open new Fragment 4.</p>
  
  <p>i want handle back key press event how can i do this on Fragment 4?after clicking back key in  Fragment 4 i want to go back Fragment 1.</p>
  
  <p><img src="https://i.stack.imgur.com/8QO0Y.png" alt="enter image description here"> </p>