Question

I have an activity that uses a fragmentpageradapter to create an ics style actionBar. Each page needs to update the actionBar though. Is there a way I can call onCreateOptionsMenu in my onPageSelected?

I’ve trimmed a lot of the code out from the example below for simplicity’s sake.

public class ListFragmentViewPagerActivity extends FragmentActivity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.thread_view);

        ViewPager pager = (ViewPager) findViewById(android.R.id.list);
        pager.setAdapter(new ExamplePagerAdapter(getSupportFragmentManager()));
        TitlePageIndicator indicator = (TitlePageIndicator)findViewById(R.id.indicator);
        indicator.setViewPager(pager);
        indicator.setOnPageChangeListener(new OnPageChangeListener() {
             @Override
             public void onPageSelected(int position) {

                 }

            @Override
            public void onPageScrollStateChanged(int arg0) {                
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {                
            }
        });
    }

    public class ExamplePagerAdapter extends FragmentPagerAdapter implements TitleProvider{

        public ExamplePagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            return URLS.size();
        }

        @Override
        public Fragment getItem(int position) {
            Fragment fragment = new ThreadFragment();

            // set arguments here, if required
            Bundle args = new Bundle();
            fragment.setArguments(args);

            return fragment;
        }

        @Override
        public String getTitle(int pos) {
            return TITLES.get(pos);
        }

    }

    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuinflate = new MenuInflater(this);
        menuinflate.inflate(R.menu.thread_menu, menu);
        if (type.equals("xda")) {
            menu.removeItem(R.id.ss_view);
        }

            //This worked when I only needed to call it one time. I need to update this menu for each page in my viewPager though.
        if (isFav) {
            menu.getItem(2).setIcon(R.drawable.fav_ab);
        }
        return true;        
    }   

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
            case android.R.id.home:
                Intent intent = new Intent(this, MainActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent);
            break;
            case R.id.ss_view:
                Intent ssi = new Intent(this, SSActivity.class);
                ssi.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                Bundle b = new Bundle();
                ssi.putExtras(b);
                startActivity(ssi);
            break;
            case R.id.restart:
            break;
            case R.id.fav_ab:
                break;
            default:
                return super.onOptionsItemSelected(item);
        }
        return false;
    }    
}

UPDATE
Calling invalidateOptionsMenu() in my onPageSelected() did the trick!

Answer 1

Use invalidateOptionsMenu() but make sure you wrap this in a trycatch if you are supporting anythign below 3.0, as this method does not exist and will crash!

If you want to update your menu on pre 3.0 devices, override the onPrepareOptionsMenu() as well, which will be called everytime the menu is opened.