Codice per il viewPager.

Mi salvo un codice e torno ad esercitarmi su di esso...

public class MainActivity extends AppCompatActivity implements FragmentBarra.OnFragmentInteractionListener{

    Helper helper;
    Frammento myFrag;
    FragmentBarra fragmentBarra;
    PagerAdapter adapter;
    ViewPager viewPager;
    ArrayList lista;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lista=new ArrayList();
        lista.add("Gongolo");
        lista.add("Mammolo");
        lista.add("Eolo");
        lista.add("Pisolo");
        lista.add("Brontolo");
        lista.add("Dotto");
        lista.add("Cucciolo");
        helper=new Helper(this);

        viewPager=(ViewPager)findViewById(R.id.vpdisplay);
        adapter=new ScreenSlidePagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);

        fragmentBarra = new FragmentBarra();
        FragmentManager fragmentManager=getSupportFragmentManager();
        FragmentTransaction transaction=fragmentManager.beginTransaction();
        transaction.add(R.id.barra,fragmentBarra);

        /*helper.save("Pinco");
        helper.save("Lappo");
        helper.save("Bobbo");*/





    }

    @Override
    public void onFragmentInteraction() {
        myFrag.getView().setBackgroundColor(Color.GREEN);
    }

    public class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter{

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

        @Override
        public Fragment getItem(int position) {

            return MioFrammento.newInstance(position,lista);
        }

        @Override
        public int getCount() {
            return 10;
        }
    }

    public static class MioFrammento extends Fragment{
        int numero;
        Serializable lista;
        public static MioFrammento newInstance(int num, ArrayList lista){
            MioFrammento f=new MioFrammento();
           0
            Bundle args=new Bundle();
            args.putInt("num",num);
            args.putSerializable("lista",lista);
            f.setArguments(args);
            return f;
        }

        @Override
        public void onCreate(Bundle savedInstanceState){
            super.onCreate(savedInstanceState);
            numero= getArguments().getInt("num");
            lista=getArguments().getSerializable("lista");
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
            View v=inflater.inflate(R.layout.mio_frammento,container,false);
            TextView textView=(TextView)v.findViewById(R.id.textView);
            textView.setText(((ArrayList)lista).get(numero));
            return v;
        }
    }


}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="#AAFFFF"
    android:orientation="horizontal"
    android:id="@+id/container"
    android:layout_height="match_parent"
    android:layout_width="match_parent">

    <LinearLayout
        android:id="@+id/barra"
        android:orientation="horizontal"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"/>

    <android.support.v4.view.ViewPager
        android:id="@+id/vpdisplay"
        android:layout_height="match_parent"
        android:layout_width="0dp"
        android:layout_weight="4">

    </android.support.v4.view.ViewPager>

</LinearLayout>