Viewpager navigatation of fragment in circular way in forward horizonaral direction

Question

Hii My question is i have 6 frgments and i am using ViewPager to navigate from one page to another vise-versa.but i want after 6th fragment by one horizontal forward swipe to comeback to 1 Fragment .like from 6->1

Answer 1

Try to add the first fragment one more time at the end of the queue and when it is loaded, use viewPager.setCurrentItem(0, false) to move to the first fragment.

Actualy, it does not always work. Referring to this answer ViewPager as a circular queue / wrapping,

I made a simple example have a look :

public class MainActivity extends FragmentActivity  {

private static final int NUM_PAGES = 6;
private ViewPager pager;
private PagerAdapter pagerAdapter;
private List<SlideFragment> slideList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    slideList = new ArrayList<SlideFragment>();
    for (int i = 0; i<NUM_PAGES; i++){
        SlideFragment slide = new SlideFragment();
        slide.setIndex(i+1);
        slideList.add(slide);
    }

    pager = (ViewPager) findViewById(R.id.pager);
    pagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
    pager.setAdapter(pagerAdapter);
}

private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        int _pos = position % NUM_PAGES;
        return slideList.get(_pos);
    }

    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }
}
}

And the Fragment class :

public class SlideFragment extends Fragment {

private int index;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    ViewGroup root = (ViewGroup)inflater.inflate(R.layout.slide, container, false);
    TextView tw = (TextView) root.findViewById(R.id.textView);
    tw.setText(Integer.toString(index));
    return root;
}

public void setIndex(int index){
    this.index = index;
}
}