actionbar up navigation with fragments

Question

I have a tabbed Actionbar/viewpager layout with three tabs say A, B, and C. In tab C tab(fragment),I am adding another fragment say fragment D. with

 DFragment f= new DFragment();  ft.add(android.R.id.content, f, "");  ft.remove(CFragment.this);  ft.addToBackStack(null);  ft.commit(); 

I modify actionbar in DFragment's onResume to add up button:

ActionBar ab = getActivity().getActionBar(); ab.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); ab.setDisplayHomeAsUpEnabled(true); ab.setDisplayShowHomeEnabled(true); 

Now in DFragment, when I press hardware(phone) Back button, I return to the original Tabbed(ABC) layout with CFragment selected. How can I achieve this functionality with actionbar up button?

Answer 1

Implement OnBackStackChangedListener and add this code to your Fragment Activity.

@Override public void onCreate(Bundle savedInstanceState) {     //Listen for changes in the back stack     getSupportFragmentManager().addOnBackStackChangedListener(this);     //Handle when activity is recreated like on orientation Change     shouldDisplayHomeUp(); }  @Override public void onBackStackChanged() {     shouldDisplayHomeUp(); }  public void shouldDisplayHomeUp(){    //Enable Up button only  if there are entries in the back stack    boolean canGoBack = getSupportFragmentManager().getBackStackEntryCount()>0;    getSupportActionBar().setDisplayHomeAsUpEnabled(canGoBack); }  @Override public boolean onSupportNavigateUp() {     //This method is called when the up button is pressed. Just the pop back stack.     getSupportFragmentManager().popBackStack();     return true; }