Is there a way to get fragment from top of stack?

Question

I have a ListFragment in my MainActivity. Here is how I set my fragment object.

FragmentManager fragmentManager = activity.getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); Fragment newFragment = new MyFragment(); fragmentTransaction.replace(R.id.framecontainer, newFragment, "tag"); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); 

The problem is when the user press back button, I have to, at least, change the action bar and menu by calling

getActionBar().setTitle(title); getActionBar().setDisplayHomeAsUpEnabled(isEnabled); invalidateOptionsMenu(); 

I have to know what kind of fragment is showing currently, so that I know how to set the action bar. I store the setting option in fragment as arguments.

String title = fragment.getArguments().getString("KEY_TITLE"); boolean isEnabled = fragment.getArguments().getBoolean("KEY_ISENABLED"); 

I do search the related question, and I realized I could get the fragment by calling

MyFragment fragment = (MyFragment) getSupportFragmentManager()         .findFragmentByTag("tag"); 

However, I have to store all the tag in a custom stack, and call pop() everytime when user pressed back button in onBackPressed().

So, my question is that is there a way for me to get the current visible fragment from the stack directly?

Note: Please keep in mind that the fragment types are different, not just only MyFragment.

Answer 1

Some thing like this should help your activity figure this out on backpress:

private Fragment getCurrentFragment(){     FragmentManager fragmentManager = getSupportFragmentManager();     String fragmentTag = fragmentManager.getBackStackEntryAt(fragmentManager.getBackStackEntryCount() - 1).getName();     Fragment currentFragment = fragmentManager.findFragmentByTag(fragmentTag);     return currentFragment; }  @Override public void onBackPressed() {     Fragment fragmentBeforeBackPress = getCurrentFragment();     // Perform the usual back action     super.onBackPressed();     Fragment fragmentAfterBackPress = getCurrentFragment(); } 

Hope this helps.