Using onPrepareOptionsMenu instead of onCreateOptionsMenu in Fragment
You should call super.onCreateOptionsMenu(menu, inflater);
after you have created your menu, not before. That sends the menu up in the hierarchy and other fragments or the activity may want to add items themselves.
The activity is responsible for the displaying and managing the menu, so if you change the visibility after it has been sent to the activity, nothing much is going to happen.
Now, when you call super.onPrepareOptionsMenu(menu);
it will "prepare" it's menu, but it will now take the changes you've made in the onCreateOptionsMenu
into account.
Sebastian Contreras
Updated on December 06, 2020Comments
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Sebastian Contreras over 3 years
I had a problem setting up some fragment menu items in the
ActionBar
and I found a way to solve it, but I don't understand why it worked.I wanted to change the visibility in a menu item right after I inflated it from a menu xml file in
onCreateOptionsMenu
method. The code seems to work fine, but there's no visible effect. I solved the problem inflating the menu inonCreateOptionsMenu
method but changing the visibility of it inonPrepareOptionsMenu
method.What I want to know is why changing the visibility in
onCreateOptionsMenu
does not work.What can I do in
onPrepareOptionsMenu
that I can't do inonCreateOptionsMenu
?Is there any pattern to follow here?
Thanks!
Here's the relevant code, just in case:
public class MyFragment extends Fragment { @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); inflater.inflate(R.menu.my_menu, menu); // This does not work, compiles and runs fine, but has no visible effect MenuItem someMenuItem = menu.findItem(R.id.some_menu_item); someMenuItem.setVisible(false); } @Override public void onPrepareOptionsMenu(Menu menu) { super.onPrepareOptionsMenu(menu); // This does work MenuItem someMenuItem = menu.findItem(R.id.some_menu_item); someMenuItem.setVisible(false); } }