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TabLayout inside the fragment gives the wrong kind of elements

I am working on a project that I use Tablayout inside a fragment, I have three tabs where they extract data from a web service, this part of the application questions shows that we have three categories, one for the latter, the second for un answered the third for all view question

here is my situation, my web developer is designing me the question of returning web services, they all use the same structure in the returned element, but the data changes as required.

public class Questions_Fragment extends Fragment  {

    private TabLayout mTablayout;
    private ViewPager mViewpager;

    public static Questions_Fragment newInstance() {
        Questions_Fragment fragment = new Questions_Fragment();
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.questions_layout, null);
        mViewpager = (ViewPager) v.findViewById(R.id.viewPager);
        setupViewPager(mViewpager);

        mTablayout = (TabLayout) v.findViewById(R.id.tabs);
        mTablayout.setupWithViewPager(mViewpager);

        return v;
    }

    private void setupViewPager(ViewPager mViewpager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
        adapter.addFrag( QuestionsFragModel.newInstance(VolleyRequestHandler.RECENT_INT) , getResources().getString(R.string.newest));
        adapter.addFrag( QuestionsFragModel.newInstance(VolleyRequestHandler.UNANSWER_INT) , getResources().getString(R.string.notanswered));
        adapter.addFrag( QuestionsFragModel.newInstance(VolleyRequestHandler.ALLPOSTS_INT) , getResources().getString(R.string.allposts));
        mViewpager.setAdapter(adapter);
    }

my view pager adapter class i expand FragmentStatePagerAdapterdata may change every time the user opens the tab

public class ViewPagerAdapter extends FragmentStatePagerAdapter {
    private List<Fragment> mFragmentList = new ArrayList<>();
    private List<String> mFragmentTitleList=  new ArrayList<>();

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

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFrag(Fragment fra , String title){
        mFragmentList.add(fra);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}

, , , , ,

, , ?

public class ListViewAdapter extends RecyclerView.Adapter<ListViewAdapter.ViewHolder> {

    private Context _Context;

    private List<QuestionItem> Questions = new ArrayList<>();
    private API api;
    private int num;
    private int lastPosition = -1;
    public static final String BASE_POST_URl = "url....";


    public ListViewAdapter(Context context, List<QuestionItem> Questions) {
        this._Context = context;
        this.Questions = Questions;
        api = new API(context);
    }

    public ListViewAdapter(Context context, List<QuestionItem> Questions,
                           int num) {
        this._Context = context;
        this.Questions = Questions;
        this.num = num;
        api = new API(context);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(_Context);
        View itemView = inflater.inflate(R.layout.question_row, parent, false);
        return new ViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        Typeface tf = Typeface.createFromAsset(_Context.getAssets(),
                "fonts/GE_SS_Two_Bold.otf");
        Typeface tfreg = Typeface.createFromAsset(_Context.getAssets(),
                "fonts/GE_SS_Two_Light.otf");

        ImageLoader _ImageLoader = MySingleton.getInstance(_Context).getmImageLoader();

        if (Questions.get(position).user.userimageURL != null) {
            if (!Questions.get(position).user.getUserimageURL().isEmpty()) {
                //holder.userimageprog.setVisibility(View.VISIBLE);
                holder.imageView.setImageUrl(Profile_Fragment.BASE_URL + Questions.get(position).user.getUserimageURL(), _ImageLoader);
            }
        }

        if(Questions.get(position).Que_image_url != null){
            if (!Questions.get(position).getQue_image_url().isEmpty()) {
                holder._FrameLayout.setVisibility(View.VISIBLE);
                holder.post_img.setVisibility(View.VISIBLE);
                //holder.post_img_pro.setVisibility(View.VISIBLE);
                holder.post_img.setImageUrl(BASE_POST_URl + Questions.get(position).getQue_image_url(), _ImageLoader);
            }
        }

        holder.imageView.setDefaultImageResId(R.drawable.profile);
        holder.username.setTypeface(tf);
        holder.desc.setTypeface(tfreg);
        holder.Date.setTypeface(tfreg);
        holder.AnswersCount.setTypeface(tfreg);

        if(Questions.get(position).user.username != null){
            holder.username.setText(Questions.get(position).user.username);
        }
        if(Questions.get(position).Que_Content != null){
            holder.desc.setText(Questions.get(position).Que_Content);
        }
        if(Questions.get(position).category != null){
            holder.Category.setText(Questions.get(position).category);
        }

        if(Questions.get(position).Que_Date != null){
            holder.Date.setText(Questions.get(position).Que_Date);
        }

        if (!Questions.get(position).getComment().isEmpty()) {
            holder.arrow.setVisibility(View.VISIBLE);
            holder.AnswersCount.setVisibility(View.VISIBLE);
            holder.AnswersCount.setText(_Context.getResources().getString(R.string.youhaveanswer));
        }
        holder.arrow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent (_Context , ViewAnswers.class);
                intent.putExtra("passedobject", (Parcelable) Questions.get(position));
                _Context.startActivity(intent);
            }
        });


//      Animation animation = null;
//       animation = AnimationUtils.loadAnimation(_Context,
//                 R.anim.up_from_bottom);
//       animation.setDuration(500);
//          view.setAnimation(animation);
//            animation = null;
//
//      Animation animation = AnimationUtils.loadAnimation(_Context,
//              (pos > lastPosition) ? R.anim.up_from_bottom
//                      : R.anim.down_from_top);
//      view.startAnimation(animation);
//      lastPosition = pos;

    }

    @Override
    public long getItemId(int position) {
        return position;
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {

        protected NetworkImageView imageView, post_img;
        protected TextView desc, Category, username, Date, AnswersCount;
        protected ProgressBar userimageprog, post_img_pro;
        protected ImageView arrow;
        protected FrameLayout _FrameLayout;

        public ViewHolder(View itemView) {
            super(itemView);
            imageView = (NetworkImageView) itemView.findViewById(R.id.ques_user_img);
            desc = (TextView) itemView.findViewById(R.id.ques_content);
            Category = (TextView) itemView.findViewById(R.id.category);
            post_img = (NetworkImageView) itemView.findViewById(R.id.post_img);
            userimageprog = (ProgressBar) itemView.findViewById(R.id.userimgae_prog);
            post_img_pro = (ProgressBar) itemView.findViewById(R.id.post_prog);
            username = (TextView) itemView.findViewById(R.id.username_ques);
            Date = (TextView) itemView.findViewById(R.id.date);
            AnswersCount = (TextView) itemView.findViewById(R.id.answers_con);
            arrow = (ImageView) itemView.findViewById(R.id.imageView1);
            _FrameLayout = (FrameLayout)itemView.findViewById(R.id.frameLayout2);

        }
    }
}

QuestionFragModel view

public class QuestionsFragModel extends Fragment implements OnClickListener {

    private RecyclerView Ques_list;
    private ProgressBar list_prog;
    private ListViewAdapter adapter;
    private List<QuestionItem> Questions = new ArrayList<>();
    private TextView reload;
    private VolleyRequestHandler _VolleyRequestHandler;
    private int CONST_TYPE = 0;
    public static final String PASSED_INT = "passed_number";
    private CoordinatorLayout _coordiatelayout;


    static QuestionsFragModel newInstance(int type) {
        QuestionsFragModel f = new QuestionsFragModel();
        Bundle bundle = new Bundle();
        bundle.putInt(PASSED_INT , type);
        f.setArguments(bundle);
        return f;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.question_layout, container, false);
        CONST_TYPE = getArguments() != null ? getArguments().getInt(PASSED_INT) : 7;
        _VolleyRequestHandler = new VolleyRequestHandler(getActivity());
        _coordiatelayout = (CoordinatorLayout) v.findViewById(R.id.coordiatelayout);

        Ques_list = (RecyclerView) v.findViewById(R.id.questionlist);
        Ques_list.setLayoutManager(new LinearLayoutManager(getActivity()));
        adapter = new ListViewAdapter(getActivity(), Questions);
        Ques_list.setAdapter(adapter);


        list_prog = (ProgressBar) v.findViewById(R.id.progressbar);
        reload = (TextView) v.findViewById(R.id.reload);

        getQuestationsPosts();

        reload.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View position) {
                getQuestationsPosts();
            }
        });

        final FloatingActionButton floatingView = (FloatingActionButton) v.findViewById(R.id.FloatingView);
        if (floatingView != null) {
            floatingView.setOnClickListener(this);
        }
        return v;
    }

    public void getQuestationsPosts() {
        API api = new API(getActivity());
        if (api.isNetworkConnected()) {
            list_prog.setVisibility(View.VISIBLE);
            reload.setVisibility(View.GONE);
            FetchQuestationsFromWeb();
        } else {
            Snackbar.make(_coordiatelayout, getResources().getString(R.string.nointernet), Snackbar.LENGTH_LONG).show();
            Ques_list.setVisibility(View.GONE);
            reload.setVisibility(View.VISIBLE);
        }
    }
    private void onSuccessResponse(Object response){
        list_prog.setVisibility(View.GONE);
        reload.setVisibility(View.GONE);
        Ques_list.setVisibility(View.VISIBLE);
        if(Questions != null){
            Questions.clear();
        }
        Questions = (List < QuestionItem>)  response;
        adapter = new ListViewAdapter(getActivity() ,Questions);
        Ques_list.setAdapter(adapter);
    }
    private void onErrorResponse(String error){
        list_prog.setVisibility(View.GONE);
        reload.setVisibility(View.VISIBLE);
        Snackbar.make(_coordiatelayout , error , Snackbar.LENGTH_LONG).show();
    }
    private void FetchQuestationsFromWeb() {

        _VolleyRequestHandler.HandleRequests(Request.Method.POST , CONST_TYPE, null, new VolleyResponseCallBack() {
            @Override
            public void RequestSuccess(Object response) {
                onSuccessResponse(response);
            }

            @Override
            public void RequestFailed(String error) {
                onErrorResponse(error);
            }
        });
    }

    @Override
    public void onClick(View arg0) {
        startActivity(new Intent(getActivity(), Add_Question.class));
    }


}
+4
2

, FragmentStatePagerAdapter FragmentPagerAdapter, 3 .

AFAIK, FragmentStatePagerAdapter , , .

, FragmentStatePagerAdapter Bundle savedInstanceState, . , .

, savedInstanceState :

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.question_layout, container, false);

        if (savedInstanceState!=null){
            // restore your state from "savedInstanceState"
        } else{
            CONST_TYPE = getArguments() != null ? getArguments().getInt(PASSED_INT) : 7;
        }
}
+1

- - , , if , ,

, ,

if (Questions.get(position).user.userimageURL != null) {
    if (!Questions.get(position).user.getUserimageURL().isEmpty()) {
        //holder.userimageprog.setVisibility(View.VISIBLE);
        holder.imageView.setImageUrl(Profile_Fragment.BASE_URL + Questions.get(position).user.getUserimageURL(), _ImageLoader);
    }
} else{
    // I should use else statement as well                  
}
+1

Source: https://habr.com/ru/post/1620516/

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