Android Tabbed activity duplicating tabs

Question

Something weird is happening here, i created an rss feed app with view pager when i go to 2nd tab from the 1st tab , the contents of 3rd tab are coming to 2nd tab . When I go to the 1st tab from 2nd tab , the contents of 1st tab are coming to 2nd tab . something mixing without any logic (or i could not find the logic), why it is happening.. ? is there any way of clearing the current tab before going to next tab ?( don't know this is the correct question i supposed to ask )

Here is my code

public class datafragment extends Fragment {
View view;
ViewPager viewPager;
TabLayout tabLayout;


@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    view= inflater.inflate(R.layout.sample,container,false);


    viewPager = (ViewPager) view.findViewById(R.id.viewpager);
    viewPager.setAdapter(new sliderAdapter(getChildFragmentManager()));
    tabLayout = (TabLayout) view.findViewById(R.id.sliding_tabs);
    tabLayout.post(new Runnable() {
        @Override
        public void run() {
            tabLayout.setupWithViewPager(viewPager);
        }
    });

    return view;

}

private class sliderAdapter extends FragmentPagerAdapter{

    final  String tabs[]={"tab1", "tab2","tab3"};
    public sliderAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        Fragment fragment= null;
        switch (position){
            case 0:
                fragment = new RssFragment();
                break;

            case 1:
                fragment = new RssFragment1();
                break;
            case 2:
                  fragment = new RssFragment2();
                break;
        }
        return fragment;
    }

    @Override
    public int getCount() {


       return 3;
    }
   @Override
   public CharSequence getPageTitle(int position) {
        return tabs[position];
   }
}

 }

After adding the answer

 public class datafragment extends Fragment {
View view;
ViewPager viewPager;
TabLayout tabLayout;


@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {


    view= inflater.inflate(R.layout.sample,container,false);
    viewPager = (ViewPager) view.findViewById(R.id.viewpager);
    viewPager.setAdapter(new SliderAdapter(getChildFragmentManager()));
    tabLayout = (TabLayout) view.findViewById(R.id.sliding_tabs);
   // tabLayout.post(new Runnable() {
   //     @Override
   //     public void run() {
   //         tabLayout.setupWithViewPager(viewPager);
   //     }
   // });

    **setupViewPager(viewPager);**

    return view;

}



private void setupViewPager(ViewPager viewPagerProfile)
{
    SliderAdapter  adapter = new SliderAdapter (getActivity().getSupportFragmentManager());
    adapter.addFragment(new RssFragment(), "tab1");
    adapter.addFragment(new RssFragment1(), "tab2");
    adapter.addFragment(new RssFragment2(), "tab3");

    viewPagerProfile.setAdapter(adapter);
}

public class SliderAdapter  extends FragmentPagerAdapter
{
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public SliderAdapter (FragmentManager manager)
    {
        super(manager);
    }

    @Override
    public Fragment getItem(int position)
    {
        return mFragmentList.get(position);
    }

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

    public void addFragment(Fragment fragment, String title)
    {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position)
    {
        return null;
    }
}


}

Answer 1

Try this way:

private void setupViewPager(ViewPager viewPagerProfile)
        {
            SliderAdapter  adapter = new SliderAdapter (getSupportFragmentManager());
            adapter.addFragment(new RssFragment(), "tab1");
            adapter.addFragment(new RssFragment1(), "tab2");
            adapter.addFragment(new RssFragment2(), "tab3");

            viewPagerProfile.setAdapter(adapter);
        }

Custom Adapter:

public class SliderAdapter  extends FragmentPagerAdapter
{
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public SliderAdapter (FragmentManager manager)
    {
        super(manager);
    }

    @Override
    public Fragment getItem(int position)
    {
        return mFragmentList.get(position);
    }

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

    public void addFragment(Fragment fragment, String title)
    {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position)
    {
        return null;
    }
}

If you want to do something on selected fragment, Add listenre:

TabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener()
{
    @Override public void onTabSelected(TabLayout.Tab tab)
    {
        //Code here for selected fragment 
    }

    @Override public void onTabUnselected(TabLayout.Tab tab)
    {

    }

    @Override public void onTabReselected(TabLayout.Tab tab)
    {

    }
});