ViewPager и переработчик видят беспорядок

Question

У меня странная проблема с ViewPager, я следил за этой страницей https://developer.android.com/training/animation/screen-slide,, но вместо этого я использую RecyclerView для своей второй страницы фрагмента. Первая страница, представляющая собой простой фрагмент структуры кадра, отображается правильно. Но страница повторного просмотра полностью загромождена (пролистывание влево). Это как первая страница ниже, а вторая копируется несколько раз сверху, см. screendump . Кто-нибудь, кто признает эту проблему?

The ViewPager (callerpager)

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:id="@+id/caller_pager" android:layout_height="match_parent">
    <android.support.v4.view.PagerTitleStrip
        android:id="@+id/pager_title_strip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:background="#33b5e5"
        android:textColor="#fff"
        android:paddingTop="4dp"
        android:paddingBottom="4dp" />
</android.support.v4.view.ViewPager>

The RecyclerView (caller_log_list)
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView android:id="@+id/caller_log_list_view"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:scrollbars="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android" />
    
The RecyclerViewItem (caller_log_list_item)
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:paddingTop="10dp"
    android:paddingBottom="10dp"
    app:layout_constraintHeight_default="wrap">

    <TextView
        android:id="@+id/logcreated"
        android:layout_width="0dp"
        android:layout_height="20dp"
        android:layout_marginStart="4dp"
        android:text="Oppretta"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/log"
        android:layout_width="211dp"
        android:layout_height="39dp"
        android:layout_marginStart="5dp"
        android:layout_weight="1"
        android:text="Logg"
        app:layout_constraintStart_toEndOf="@+id/logcreated"
        app:layout_constraintTop_toTopOf="parent" />

    <CheckBox
        android:id="@+id/logbillable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Fakturerbar"
        app:layout_constraintStart_toEndOf="@+id/log"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/loggedby"
        android:layout_width="0dp"
        android:layout_height="20dp"
        android:layout_marginStart="4dp"
        android:text="Logget av"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/logcreated" />

</android.support.constraint.ConstraintLayout>


CallLoggerListFragment 

public class CallerLogListFragment extends Fragment {
    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;
    private RecyclerView.LayoutManager layoutManager;

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

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

    private void refreshFragment() {
        recyclerView = (RecyclerView) getView().findViewById(R.id.caller_log_list_view);
        layoutManager = new LinearLayoutManager(getContext());
        try {
            JSONArray log = PMCallogHandler.getCurrentLogList();
            if (log.length()>0) {
                adapter = new MyAdapter(log);
                recyclerView.setAdapter(adapter);
                recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser && getView()!=null) {
            System.out.println("User in the Fragment2");
            refreshFragment();
        }
        else {
            // User is not viewing the fragment,
            // or fragment is our of the screen
            System.out.println("User left Fragment2");
        }
    }


    @Override
    public void onResume() {
        super.onResume();
        refreshFragment();
    }
}

class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private JSONArray dataset;

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        private TextView createdDate;
        private TextView loggedBy;
        private TextView log;
        private CheckBox isBillable;

        public MyViewHolder(View v) {
            super(v);
            createdDate = (TextView)v.findViewById(R.id.logcreated);
            loggedBy = (TextView)v.findViewById(R.id.loggedby);
            log = (TextView)v.findViewById(R.id.log);
            isBillable=(CheckBox)v.findViewById(R.id.logbillable);
        }

        public void setCreatedDate(String date) {
            createdDate.setText(date);
        }
        public void setLoggedBy(String loggedBy) {
            this.loggedBy.setText(loggedBy);
        }
        public void setLog(String log) {
            this.log.setText(log);
        }
        public void setBillable(boolean isBillable) {
            this.isBillable.setChecked(isBillable);
        }
    }

    public MyAdapter(JSONArray myDataset) {
        dataset = myDataset;
    }

    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
                                                     int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.caller_log_list_item, parent, false);

        MyViewHolder vh = new MyViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        JSONObject rw = null;
        try {
            rw = dataset.getJSONObject(position);
            holder.setBillable(rw.getBoolean("billable"));
            holder.setCreatedDate(rw.getString("created"));
            holder.setLog(rw.getString("title"));
            holder.setLoggedBy("...");
        }catch(Exception e) {
            e.printStackTrace();
        }
    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return dataset.length();
    }
}

The LoggingActivity

public class LoggingActivity extends FragmentActivity {
    private ViewPager pager = null;
    private PagerAdapter pagerAdapter=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        try {
            setContentView(R.layout.caller_pager);
            pager = (ViewPager) findViewById(R.id.caller_pager);
            pagerAdapter = new CallerLogPageAdapter(getSupportFragmentManager(),getIntent().getExtras().getString("logResponse"));
            pager.setAdapter(pagerAdapter);
            //pager.addOnPageChangeListener();

        } catch (Exception e) {
            e.printStackTrace();
        }
   }


    @Override
    public void onBackPressed() {
        if (pager.getCurrentItem() == 0) {
            super.onBackPressed();
        } else {
            pager.setCurrentItem(pager.getCurrentItem() - 1);
        }
    }

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

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


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return super.onOptionsItemSelected(item);
    }

    private class CallerLogPageAdapter extends FragmentStatePagerAdapter {
        private String logResponse;
        public CallerLogPageAdapter(FragmentManager fm, String logResponse) {
            super(fm);
            this.logResponse=logResponse;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            if(position == 0){
              
                return "New Contact log";
            }
            else {
                return "Contact logs";
            }
        }

        @Override
        public Fragment getItem(int position) {
            Fragment ret = null;
            if(position==0) {
                ret = new CallerLogFragment();
                Bundle args = new Bundle();
                args.putString("logResponse", logResponse.toString());
                ret.setArguments(args);
            } else if(position==1) {
                ret = new CallerLogListFragment();
                Bundle args = new Bundle();
                args.putString("contactLog", "");
                ret.setArguments(args);
            }

            return ret;
        }

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

}