How to dynamically set number of swipeable tabs in Action Bar with Fragments at runtime

Question

I am referring this link for swipeable tabs using fragments. It worked for me, but what if I need to add the number of tabs dynamically and not pre assign the number of tabs? For instance, some of my logic gives me output at times 2 strings in anarray and at times 4 strings in an array. And according to the logic I need to set the number of tabs in action bar at runtime. How can I achieve this? Can anyone show me how to achieve what I need?

Answer 1

STEP 1:

Define your TabsPagerAdapter as follows:

public class TabsPagerAdapter extends FragmentPagerAdapter {

    private ArrayList<Fragment> list;

    public TabsPagerAdapter(FragmentManager fm, ArrayList<Fragment> list) {
        super(fm);
        this.list = list;
    }

    @Override
    public Fragment getItem(int index) {
        return list.get(index);
    }

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

}

STEP 2:

When you determine the number of tabs at runtime, first make sure to create a List of the required number of Fragments. You can do it using either this:

ArrayList<Fragment> list = new ArrayList<Fragment>();
for(int i = 0; i < tabcount; i++){
    list.add(MyFragment.newInstance());
}

OR this:

ArrayList<Fragment> list = new ArrayList<Fragment>();
list.add(new GamesFragment());
list.add(new TopRatedFragment());
list.add(new MoviesFragment());

STEP 3:

When you create an Adapter for the ViewPager, pass the ArrayList of Fragments in the constructor of TabsPagerAdapter:

TabsPagerAdapter adapter = new TabsPagerAdapter(fm, list);

Try this. This will work.