Back button closing app even when using FragmentTransaction.addToBackStack()

You have to add the popBackStack() call to the onBackPressed() method of the activity.

Ex:

@Overridepublic void onBackPressed() {    if (fragmentManager.getBackStackEntryCount() > 0) {        fragmentManager.popBackStack();    } else {        super.onBackPressed();    }}

@Bobbake4's answer is awesome, but there is one little problem.Let's say I have three fragments A, B and C.A is the main Fragment (the fragment that shows when I launch my app), B and C are fragments I can navigate to from the navigation drawer or from A.Now, when I use the back button from B or C, I go back to the previous fragment (A) alright, but the title of the previous fragment (fragment B or C) now shows in the actionBar title of Fragment A. I have to press the back button again to "truly" complete the back navigation (to display the view and correct title for the fragment and returning to)

This is how I solved this problem. Declare these variables.

 public static boolean IS_FRAG_A_SHOWN = false; public static boolean IS_FRAG_B_SHOWN = false; public static boolean IS_FRAG_C_SHOWN = false;

In the MainActivity of my app where am handling navigation drawer methods, I have a method displayView(position) which handles switching of my fragments.

private void displayView(int position) {    IS_FRAG_A_SHOWN = false;    IS_FRAG_B_SHOWN = false;    IS_FRAG_C_SHOWN = false;    // update the main content by replacing fragments    Fragment fragment = null;    switch (position) {        case 0:            fragment = new FragmentA();            IS_FRAG_A_SHOWN = true;            break;        case 1:            fragment = new FragmentB();            IS_FRAG_B_SHOWN = true;            break;        case 2:            fragment = new FragmentC();            IS_FRAG_C_SHOWN = true;            break;        default:            break;    }

finally, in my onBackPressed method, I do this:

public void onBackPressed() {    if(fragmentManager.getBackStackEntryCount() != 0) {        fragmentManager.popBackStack();        if (IS_FRAG_A_SHOWN) { //If we are in fragment A when we press the back button, finish is called to exit            finish();        } else  {            displayView(0); //else, switch to fragment A        }    } else {        super.onBackPressed();    }}