title: Fragment Replacing Existing Fragment
body: <p>I have the MainActivity, it contains ListFragment and framelayout, I am able to change the fragments on list on item click.</p>
  
  <p>I have a problem to replace the existing <code>Fragment1</code> with the new <code>Fragment2</code>, on button click of <code>Fragment1</code>, <code>Fragment2</code> should replace the <code>Fragment1</code>, and should have the same ListFragment at left, and back buttons should be properly handled,this means when I am in <code>Fragment2</code> and press back button it should show the same ListFragment and Fragment1.</p>