Sliding between fragments

Question

I'm developing an app and currently I am trying to add ScreenSlide to it. I managed to do this using a tutorial, but usual sliding between x pages is not quite what I'm looking for.

With code provided below I can slide between 5 pages, but pages aligned in a straight line and you can't go from first page straight to 5th and vise versa. In my app I have 4 pages. When I slide left I switch between first 2 pages, when I slide right I switch between 2 last pages. On image below you can see how my current code switches page and under it - my goal.

    public class MainActivity extends FragmentActivity {
    private static final int NUM_PAGES = 5;


    private ViewPager mPager;
    private ScreenSlidePageFragment[] pages = new ScreenSlidePageFragment[NUM_PAGES];


    private PagerAdapter mPagerAdapter;

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

        mPager = (ViewPager) findViewById(R.id.pager);
        mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
        mPager.setAdapter(mPagerAdapter);

    }

    @Override
    public void onBackPressed() {
        if (mPager.getCurrentItem() == 0) {
            super.onBackPressed();
        } else {
            mPager.setCurrentItem(mPager.getCurrentItem() - 1);
        } 
    }

    private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
        public ScreenSlidePagerAdapter(FragmentManager fm) {
            super(fm);
        }



        @Override
        public int getCount() {
            return NUM_PAGES;
        }

        @Override
        public Fragment getItem(int position) {
            boolean moveRight = mPager.getCurrentItem() < position;
            boolean moveLeft = mPager.getCurrentItem() > position;
            switch(position){
                case 5: 
                    if(moveRight){

                        return geLog.w("i"
                            + "Info", Integer.toString(position));
                       //return getPageByPosition(2);
                    if(moveLeft)
                        return getPageByPosition(2);


            }
            return new ScreenSlidePageFragment();
        }

        private Fragment getPageByPosition(int position){
            int index = position - 1;
            if(index < 0 || index > NUM_PAGES-1)
                throw new InvalidParameterException("requested position is invalid");

            if(pages[index] == null)
                pages[index] = new ScreenSlidePageFragment();
            return pages[index]; 
        }

    }


}

[UPDATE]

I've managed to write a code that allows me to infinitely slide to the right between 6 different pages. Left side is limited though - I can slide only to the first page(so if I'm on 1st page after I cycled 3 times to the right, I can make only 3 cycles backwards). I think I am very close to finding the solution. Any ideas?

MainActivity.java

    public class MainActivity extends FragmentActivity  {

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

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

    slideList = new ArrayList<ScreenSlidePageFragment>();
    for (int i = 0; i<NUM_PAGES; i++){
        ScreenSlidePageFragment slide = new ScreenSlidePageFragment();
        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;
    }
}
}

ScreenSlidePageFragment.java

  public class ScreenSlidePageFragment 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;
        }
        }

Answer 1

One possible workaround is not using viewpager, but creating your own custom Slider, I ended up with this solution, since ViewPager is very unflexible, like for example if you try to do something like Facebook Page app kind of thing. Cons: you have to manage all the touches and lifecycle.

Another simpler solution for this is basically use the following API if I understand the question correctly it should be enough. ViewPager.setCurrentItem