I'm working on an application in which tabs are implemented using FragmentActivity
. Since, tabs are required throughout the application, fragments are used extensively to make the application compatible on all the versions of android.
As a consequence, I'm facing a problem in visualizing as to what fragments are present on the backstack. I'm sure there is a way to retrieve the list of fragments present on the backstack . Thanks.
The FragmentManager has methods:
getBackStackEntryCount()
getBackStackEntryAt (int index)
FragmentManager fm = getFragmentManager();
for(int entry = 0; entry<fm.getBackStackEntryCount(); entry++){
Log.i(TAG, "Found fragment: " + fm.getBackStackEntryAt(entry).getId());
}
If you want to check which fragment is visible and if you know the id of view where fragment is placed, first you have to add below in onCreate()
getSupportFragmentManager().addOnBackStackChangedListener(new OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
Fragment f = getSupportFragmentManager().findFragmentById(R.id.content_frame);
if (f != null){
updateActionBarTitle(f);
}
}
});
private void updateActionBarTitle(Fragment fragment) {
String fragClassName = fragment.getClass().getName();
if (fragClassName.equals(FirstFragment.class.getName())) {
setTitle("Home");
} else if (fragClassName.equals(SecondFragment.class.getName())) {
setTitle("Second");
}
}
This will update your action bar title on back stack change listener.
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