Mi aplicación tiene 2 pestañas con dos diseños diferentes. cuando ejecuto la aplicación, el fragmento que se supone que se muestra en la pestaña 1 (posición 0) se muestra en la pestaña 2, y el fragmento que se supone que está en la pestaña 2 (posición 1) no se muestra. Además, cuando deslizo la pantalla, el foco de la pestaña no cambia en la tabla

He dado mi código a continuación

MainActivity.java

public class MainActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener 
{
    TabLayout tabLayoutTL;
    TabLayout.Tab linearTab, gridTab;
    ViewPager viewPagerVP;
    ViewPagerAdapter viewPagerAdapter;

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        viewPagerVP.setCurrentItem(tab.getPosition());
    }

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

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


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        viewPagerVP = (ViewPager)findViewById(R.id.viewPagerVP);
        viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
        viewPagerVP.setAdapter(viewPagerAdapter);

        tabLayoutTL = (TabLayout)findViewById(R.id.tabLayoutTL);
        linearTab = tabLayoutTL.newTab();
        gridTab = tabLayoutTL.newTab();

        linearTab.setText("Linear");
        gridTab.setText("Grid");

        tabLayoutTL.addTab(linearTab, 0);
        tabLayoutTL.addTab(gridTab, 1);
        tabLayoutTL.setOnTabSelectedListener(this);
    }
}

MainFragment.java

public class MainFragment extends Fragment {

    private static final String FRAG_TYPE = "frag_type";
    int fragType;
    RecyclerView recyclerViewRv;

    public MainFragment() {}

    public static MainFragment newInstance(int fragType) {
        MainFragment mainFragment = new MainFragment();
        Bundle args = new Bundle();
        args.putInt(FRAG_TYPE, fragType);
        mainFragment.setArguments(args);
        return mainFragment;
    }

    private void initialize() {
        recyclerViewRv = (RecyclerView)getActivity().findViewById(R.id.recyclerViewRv);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        initialize();
        new BackBone().execute();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            fragType = getArguments().getInt(FRAG_TYPE);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_linear, container, false);
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }

    @Override
    public void onDetach() {
        super.onDetach();
    }

    class BackBone extends AsyncTask<Void, Void, ArrayList<DataRecord>> {

        ProgressDialog progressDialog;
        private static final String flickrUrl = "http://www.flickr.com/services/feeds/photos_public.gne?tags=soccer&format=json&nojsoncallback=1";

        private String getData() {
            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(flickrUrl);
            try {
                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
                String data = EntityUtils.toString(httpEntity);
                return data;
            } catch (Exception e) {
                return "exception";
            }
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog = new ProgressDialog(getActivity());
            progressDialog.setTitle("Loading");
            progressDialog.setMessage("Please wait .......");
            progressDialog.show();
        }

        @Override
        protected ArrayList<DataRecord> doInBackground(Void... params) {
            ArrayList<DataRecord> dataRecords = new ArrayList<>();
            try {
                JSONObject jsonObject = new JSONObject(getData());
                JSONArray jsonArray = jsonObject.getJSONArray("items");
                for (int i = 0 ; i < jsonArray.length() ; i++) {
                    JSONObject jsonObject1 = jsonArray.getJSONObject(i);
                    DataRecord dataRecord = new DataRecord();
                    dataRecord.setName(jsonObject1.getString("title"));
                    JSONObject mediaJSONObject = jsonObject1.getJSONObject("media");
                    dataRecord.setUrl(mediaJSONObject.getString("m"));
                    dataRecords.add(dataRecord);
                }
            } catch (Exception e) {}
            return dataRecords;
        }

        @Override
        protected void onPostExecute(ArrayList<DataRecord> dataRecords) {
            super.onPostExecute(dataRecords);
            DataRecordAdapter dataRecordAdapter = new DataRecordAdapter(getActivity(), dataRecords, fragType);
            if (fragType == 1) {
                recyclerViewRv.setLayoutManager(new LinearLayoutManager(getActivity()));
                recyclerViewRv.setBackgroundColor(Color.GREEN);
            } else if (fragType == 2){
                recyclerViewRv.setLayoutManager(new GridLayoutManager(getActivity(), 2));
                recyclerViewRv.setBackgroundColor(Color.BLUE);
            }
            recyclerViewRv.setAdapter(dataRecordAdapter);
            progressDialog.dismiss();
        }

    }
}

ViewPagerAdapter.java

public class ViewPagerAdapter extends FragmentStatePagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0 :
                MainFragment mainFragment = MainFragment.newInstance(1);
                return mainFragment;
            case 1 :
                MainFragment mainFragment1 = MainFragment.newInstance(2);
                return mainFragment1;
            default :
                return null;
        }
    }

    @Override
    public int getCount() {
        return 2;
    }
}

Estoy seguro de que no hay ningún problema con los fragmets. Creo que el problema es con el tablayout. No puedo entender exactamente dónde está el problema.

DataRecordAdapter.java

public class DataRecordAdapter extends RecyclerView.Adapter<DataRecordAdapter.MyViewHolder> {

    ArrayList<DataRecord> dataRecords;
    Context context;
    int flag;
    LayoutInflater layoutInflater;

    public DataRecordAdapter(Context context, ArrayList<DataRecord> dataRecords, int flag) {
        this.context = context;
        this.dataRecords = dataRecords;
        this.flag = flag;
        layoutInflater = (LayoutInflater.from(context));
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view;
        if (flag == 1) {
            view = layoutInflater.inflate(R.layout.linear_data_layout, parent, false);
        } else {
            view = layoutInflater.inflate(R.layout.grid_data_layout, parent, false);
        }
        MyViewHolder myViewHolder = new MyViewHolder(view);
        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        DataRecord dataRecord = dataRecords.get(position);
        holder.textViewTV.setText(dataRecord.getName());
        Picasso.with(context).load(dataRecord.getUrl()).into(holder.imageViewIV);
    }

    @Override
    public int getItemCount() {
        return dataRecords.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textViewTV;
        ImageView imageViewIV;
        public MyViewHolder(View itemView) {
            super(itemView);
            textViewTV = (TextView)itemView.findViewById(R.id.textViewTV);
            imageViewIV = (ImageView)itemView.findViewById(R.id.imageViewIV);
        }
    }

}

DataRecord.java

public class DataRecord {
    String name, url;

    public String getName() {
        return name;
    }
[![enter image description here][1]][1]
    public void setName(String name) {
        this.name = name;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }
}

Echa un vistazo a las imágenes chicos. la pestaña 1 está vacía y la pestaña 2 muestra el contenido que debe estar en la pestaña 1. El contenido de la pestaña 2 no se muestra.