Android: Unable to hide Menu Item in ActionBar of Child Fragment

Question

PS see the issue before voting down or marking as duplicate.Tried all the possible approaches to hide the menu item but none seems to work.

My options_menu.xml is as follows

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/menu_search"
      android:title="@string/search_title"
      android:icon="@drawable/ic_action_search"
      android:showAsAction="collapseActionView|ifRoom"
      android:actionViewClass="android.widget.SearchView" />
<item
    android:id="@+id/menu_share"
    android:icon="@android:drawable/ic_menu_share"
    android:showAsAction="always"
    android:title="Share"/>
</menu>

I am displaying this menu on a ParentFragment where I hide the menu_share using this code

 @Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

     inflater.inflate(R.menu.options_menu, menu);
    menu.findItem(R.id.menu_share).setVisible(false);
}

This hides the Share option successfully. Now this Fragment opens a new Fragment ie a Child Fragment.

In this child Fragment, I want to hide the Search item and show only the Share option. But using the same code does not help here.

   @Override
public void  onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.options_menu, menu);
    menu.findItem(R.id.menu_search).setVisible(false);

}

I even tried putting getActivity().invalidateOptionsMenu(); but no effect, the Actionbar shows both the menu items always. Pls help me figure out what is causing this.

ERROR LOG

E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: info.androidhive.slidingmenu, PID: 27321
java.lang.NullPointerException
        at info.androidhive.slidingmenu.HomeFragment.onPrepareOptionsMenu(HomeFragment.java:476)
        at android.app.Fragment.performPrepareOptionsMenu(Fragment.java:1794)
        at android.app.FragmentManagerImpl.dispatchPrepareOptionsMenu(FragmentManager.java:1964)
        at android.app.Activity.onPreparePanel(Activity.java:2665)
        at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:540)
        at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:881)
        at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:297)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:146)
        at android.app.ActivityThread.main(ActivityThread.java:5593)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
        at dalvik.system.NativeStart.main(Native Method)

Answer 1

Instead of hiding a menu in onCreateOptionsMenu method, you can try hiding in onPrepareOptionsMenu in your parent activity for which your fragment/child fragments are a part of. Just check whether that fragment is visible (can be done by assigning a tag name to each fragment) and then write your code to hide a menu if you are in that fragment. I hope this will help you.

you can do something like this in onPrepareOptionsMenu method:

Fragment frag = getSupportFragmentManager().findFragmentByTag("YOURFRAGMENT");

    if (frag != null && frag.isVisible()) {
      menu.findItem(R.id.menu_search).setVisible(false);
    } else {
        menu.findItem(R.id.menu_share).setVisible(false);
    }
        return super.onPrepareOptionsMenu(menu);

Answer 2

在Main Fragment和Sub Fragment中，隐藏菜单onStop（），并显示菜单onResume（）。

Answer 3

Try to call the Fragment super method to make use of the parent menu Activity.

In onCreate Fragment's method call setHasOptionsMenu(true);

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}

Override onCreateOptionsMenu in your Fragment and use the MenuItem class to manipulate the items on your android-actionbar as you want, see code below.

public class NewsViewFragment extends Fragment {

    public NewsViewFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);

        MenuItem item = menu.findItem(R.id.action_news_search);

        if (SOME_BOOLEAN_VALUE) {
            item.setVisible(false);
        } else {
            item.setVisible(true);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_news_view, container, false);
    }

}

Hope this help you.