Problema con BackStack método y ViewPager en android

Question

Tengo una actividad que contiene un framelayout.En ella, tengo un fragmento que contiene el ViewPager con dos diferentes fragmentos en el interior.Cuando apreté el botón en el fragmento, puedo reemplazar el framelayout contenedor con un nuevo fragmento.Ahora, cuando yo presione de nuevo el ViewPager vista no se restaura, se ha ido.

Este es el primer fragmento:

public class CurrencyFragment extends BaseFragment {


    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }


    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

        super.onCreateOptionsMenu(menu, inflater);

    }

    // onclick method for the refresh button on the action bar
    // the method itself calls the anoteher method getCurrency()
    // it also sets visibility to progress bar and loading text and
    // sets invisible to the listview

    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.action_refresh:


            Log.i("TAG", "refresh pressed =>");
            return true;
        }
        // Handle your other action bar items...

        return super.onOptionsItemSelected(item);
    }



    // oncreateView() where the basic view is created

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



        mBankName = (TextView) view.findViewById(R.id.Currency_name);
        mBuySell = (LinearLayout) view.findViewById(R.id.Buy_Sell);
        mButtonBuy = (TextView) view.findViewById(R.id.Button_buy);
        mButtonSell = (TextView) view.findViewById(R.id.Button_sell);
        mViewpager = (ViewPager) view.findViewById(R.id.Detailpager);



        Bundle bundle = getArguments();
        if(bundle != null){
        Bank object = (Bank) bundle.getSerializable("message");
        mBankName.setText(object.getName());
        code = object.getCode();
        }

        testadapter = new ViewPagerAdapter(getFragmentManager(),code);
        mViewpager.setAdapter(testadapter);

        if(code.equals("NBG")){
            mBuySell.setVisibility(View.GONE);
             mViewpager.setOnTouchListener(new View.OnTouchListener() {

                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    // TODO Auto-generated method stub
                    return false;
                }
            });
        }else{
            mBuySell.setVisibility(View.VISIBLE);
        }

        mViewpager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // TODO Auto-generated method stub
                if (position == 0){
                    mButtonBuy.setBackgroundColor(Color.parseColor("#2FCEB8"));
                    mButtonSell.setBackgroundColor(Color.parseColor("#333333"));
                }
                else{
                    mButtonSell.setBackgroundColor(Color.parseColor("#2FCEB8"));
                    mButtonBuy.setBackgroundColor(Color.parseColor("#333333"));
                }
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // TODO Auto-generated method stub

            }


        });





        mButtonBuy.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mButtonBuy.setBackgroundColor(Color.parseColor("#2FCEB8"));
                mButtonSell.setBackgroundColor(Color.parseColor("#333333"));
                mViewpager.setCurrentItem(0);



            }
        });

        mButtonSell.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mButtonSell.setBackgroundColor(Color.parseColor("#2FCEB8"));
                mButtonBuy.setBackgroundColor(Color.parseColor("#333333"));
                mViewpager.setCurrentItem(1);


            }
        });

        return view;

    }  

}

después es reemplazado con el otro

public class DetailedCalculator extends BaseFragment {

    private View detailedView;
    private TextView mButtonBuy;
    private TextView mButtonSell;
    private TextView mDetailedBank;
    private ViewPager mDetailpager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        DetailPagerAdapter myAdapter = new DetailPagerAdapter(getFragmentManager());

        detailedView = inflater.inflate(R.layout.detail_buy_sell, container, false);
        mButtonBuy = (TextView) detailedView.findViewById(R.id.Detail_buying);
        mButtonSell = (TextView) detailedView.findViewById(R.id.Detail_selling);
        mDetailedBank = (TextView) detailedView.findViewById(R.id.Detail_BankNAme);

        mDetailpager = (ViewPager) detailedView.findViewById(R.id.Detailpager);
        mDetailpager.setAdapter(myAdapter);


        mDetailpager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                // TODO Auto-generated method stub
                if(position == 0){
                    mButtonBuy.setBackgroundColor(Color.parseColor("#2FCEB8"));
                    mButtonSell.setBackgroundColor(Color.parseColor("#333333"));
                }
                else{
                    mButtonSell.setBackgroundColor(Color.parseColor("#2FCEB8"));
                    mButtonBuy.setBackgroundColor(Color.parseColor("#333333"));
                }
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                // TODO Auto-generated method stub

            }
        });

        mButtonBuy.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                mButtonBuy.setBackgroundColor(Color.parseColor("#2FCEB8"));
                mButtonSell.setBackgroundColor(Color.parseColor("#333333"));
                mDetailpager.setCurrentItem(0);
            }
        });

        mButtonSell.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mButtonSell.setBackgroundColor(Color.parseColor("#2FCEB8"));
                mButtonBuy.setBackgroundColor(Color.parseColor("#333333"));
                mDetailpager.setCurrentItem(1);

            }
        });


        return detailedView;


    }



}

Answer 1

Trate de usar getChildFragmentManager() en lugar de getFragmentManager() en el fragmento que contiene el ViewPager :

testadapter = new ViewPagerAdapter(getFragmentManager(),code);

A

testadapter = new ViewPagerAdapter(getChildFragmentManager(),code);