Question

Here is my Code:

  @Override
        public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        SearchView searchView = (SearchView) menu.findItem(R.id.menu_search)
                .getActionView();
        searchView.setSearchableInfo(searchManager
                .getSearchableInfo(getComponentName()));
        searchView.setIconifiedByDefault(true);
        searchView.setSubmitButtonEnabled(true);
        return true;
    }

    @Override
    public boolean onMenuOpened(int featureId, Menu menu) {
        MenuItem Login = menu.findItem(R.id.Login);
        MenuItem Logout = menu.findItem(R.id.Logout);
        MenuItem About = menu.findItem(R.id.About);
        MenuItem Profile = menu.findItem(R.id.Profile);

        // set the menu options depending on login status
        if (LoggedStatus == true) {
            // show the log out option
            Logout.setVisible(true);
            Login.setVisible(false);

            Profile.setVisible(true);
            About.setVisible(true);
        } else {
            // show the log in option
            Logout.setVisible(false);
            Login.setVisible(true);

            Profile.setVisible(false); // hide
            About.setVisible(true);
        }

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {

        case R.id.Login:
            Intent i = new Intent(this, Login.class);
            startActivity(i);

            return true;
        case R.id.Logout:

            return true;
        case R.id.Profile:

            return true;
        case R.id.About:

            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

I am getting Null pointer exception on each of the four MenuItem’s.
I simply want one menu for login, and one for logout.

EDIT: This is an app utilizing the Action Bar, Overflow menu and Android 4.0+
Also, More Code. Here is menu.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/menu_search"
        android:actionViewClass="android.widget.SearchView"
        android:icon="@android:drawable/ic_menu_search"
        android:showAsAction="always"
        android:title="search"/>
    <item
        android:id="@+id/Login"
        android:title="Login"/>
    <item
        android:id="@+id/Logout"
        android:title="Logout"/>
    <item
        android:id="@+id/Profile"
        android:title="My Profile"/>
    <item
        android:id="@+id/About"
        android:title="About"/>

</menu>

Answer 1

You can set visibility of MenuItem in onPrepareOptionsMenu. Try to move there.

About bonus: . In DOC they told onPrepareOptionsMenu is called everytime you press menu . I tested with one button change boolean param onClick to show/hide MenuItem and everything’s fine