setear tabs en un activity

tabs.java

ANDROID
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viewpager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager(), getBaseContext()));
        slidingTabs.setupWithViewPager(viewpager);

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  xml
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<android.support.design.widget.TabLayout
        android:id="@+id/sliding_tabs"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        style="@style/MyCustomTabLayout"
        app:tabMode="fixed"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="10"
        android:background="@android:color/white" />
          
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ADAPTER
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public class FragmentPagerAdapter extends FragmentStatePagerAdapter {

    private String[] liqTabList;
    private Context context;
    final int PAGE_COUNT = 3;

    public FragmentPagerAdapter(FragmentManager fm, Context context) {
        super(fm);
        this.context = context;
        liqTabList = context.getResources().getStringArray(R.array.liqTabArray);
    }

    @Override
    public Fragment getItem(int position) {
        switch(position){
            case 0:
                return LiquidationFragment.newInstance(position + 1);
            case 1:
                return ClientFragment.newInstance(position + 1);
            case 2:
                return TotalFragment.newInstance(position + 1);
        }
        return LiquidationFragment.newInstance(position + 1);
    }

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

    @Override
    public CharSequence getPageTitle(int position) {
        return liqTabList[position];
    }
    
    ===============================================================================================================================
    fragment
    ===============================================================================================================================
public class ClientFragment extends Fragment {
    public static final String ARG_PAGE = "ARG_PAGE";
    public static final int CLIENT_CODE = 2;
    Unbinder unbinder;
    @BindView(R.id.lnRowNewClient)
    LinearLayout lnRowNewClient;
    @BindView(R.id.btnSave)
    Button btnSave;
    @BindView(R.id.btnAdd)
    Button btnAdd;
    private int mPage;

    public static ClientFragment newInstance(int page) {

        Bundle args = new Bundle();
        args.putInt(ARG_PAGE, page);
        ClientFragment fragment = new ClientFragment();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mPage = getArguments().getInt(ARG_PAGE);
        preCargar();
        eventos();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.client_fragment_layout, container, false);
        unbinder = ButterKnife.bind(this, view);
        return view;
    }

    private void preCargar() {

    }

    private void eventos() {
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == CLIENT_CODE && resultCode == RESULT_OK){
           ClienteBean clienteBean = (ClienteBean) data.getSerializableExtra("client");
           LiquidacionController.getInstance().getClientList().add(clienteBean);
           insertarRowCliente(clienteBean);
        }
    }
    @OnClick({R.id.btnSave, R.id.btnAdd})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.btnSave:
                break;
            case R.id.btnAdd:
                sendTipoActivity(SearchCustomerActivity.class);
                break;
        }
    }

    private void sendTipoActivity(Class clase){
        Intent intent = new Intent(getContext(), clase);
        intent.putExtra("tipoActivity", "Liq");
        startActivityForResult(intent, CLIENT_CODE);
    }
}