android - How to Handle backPress with Fragment

Question

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.

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.

Answer 1

Add Fragments To BackStack. Before commit() the transaction, use addToBackStack() method i.e

 addToBackStack("Some String").commit();

and in onBackPressed()

@Override 
public void onBackPressed() { 
    if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
        getSupportFragmentManager().popBackStack(); 
    } else { 
        this.finish(); 
    }
}