私はページャー内でrecyclerviewが空のときにダイアログを表示します。android

Question

私はページャーの中でデータを表示する2つのフラグメントを扱っています。私の問題は、 2つの断片のうちの1つにmがあり、その両方の内容が空である場合、2つのダイアログが表示されます。 私はいくつかの方法を試みましたが、どれも私のために働いていませんでした。ここ

は私のページャアダプタです：フラグメントの両方が類似している

public class PagerAdapter extends FragmentStatePagerAdapter { 

ArrayList<Fragment> pages = new ArrayList<>(); 


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

@Override 
public Fragment getItem(int position) { 


    return pages.get(position); 
} 

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

@Override 
public CharSequence getPageTitle(int position) { 

    return pages.get(position).toString(); 
} 

public void addPage (Fragment f){ 
    pages.add(f); 
} 
} 

ので、私はそれらのいずれかのコードを紹介します：

public class FragmentIng extends Fragment { 
private View v; 


public FragmentIng() { 
    // Required empty public constructor 

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 


     v = inflater.inflate(R.layout.fragment_ing, null); 
     RecyclerView recyclerView = (RecyclerView) v.findViewById(R.id.recyclerview); 
     Recycler_View_Adapter adapter = new Recycler_View_Adapter(personnes1, this.getActivity()); 
     recyclerView.setLayoutManager(new LinearLayoutManager(this.getActivity())); 
     recyclerView.setAdapter(adapter); 

     RecyclerView.ItemAnimator itemAnimator = new DefaultItemAnimator(); 
     itemAnimator.setAddDuration(1000); 
     itemAnimator.setRemoveDuration(1000); 
     recyclerView.setItemAnimator(itemAnimator); 
     recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL)); 
     int i = adapter.getItemCount(); 

    if (i == 0 ){ 
     final NiftyDialogBuilder dialogBuilder= NiftyDialogBuilder.getInstance(this.getContext()); 
     dialogBuilder 
       .withTitle("Employé")         //.withTitle(null) no title 
       .withTitleColor("#FFFFFF")         //def 
       .withDividerColor("#11000000")        //def 
       .withMessage("Aucun employé à afficher")      //.withMessage(null) no Msg 
       .withMessageColor("#FFFFFFFF")        //def | withMessageColor(int resid) 
       .withDialogColor("#FFE74C3C")        //def | withDialogColor(int resid) 
       .withIcon(getResources().getDrawable(R.drawable.icon)) 
       .withDuration(700)           //def 
       .withEffect(Shake)           //def Effectstype.Slidetop 
       .withButton1Text("Retour")          //def gone 
       .withButton2Text("Annuler")         //def gone 
       .isCancelableOnTouchOutside(true)       //def | isCancelable(true) 
       //.setCustomView(R.layout.custom_view,v.getContext())   //.setCustomView(View or ResId,context) 
       .setButton1Click(new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         dialogBuilder.cancel(); 
         Toast.makeText(v.getContext(), "Principale", Toast.LENGTH_SHORT).show(); 
         Intent intent = new Intent(getActivity(), MainActivity.class); 
         getActivity().startActivity(intent); 



        } 
       }) 
       .setButton2Click(new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         //Toast.makeText(v.getContext(),"i'm btn2",Toast.LENGTH_SHORT).show(); 
         dialogBuilder.cancel(); 
        } 
       }) 
       .show(); 
    } 



    return v; 

} 
@Override 
public String toString() { 
    return "Les Employés"; 
} 

} 

を、これが私のrecyclerviewアダプタです：

public class Recycler_View_Adapter extends RecyclerView.Adapter<View_Holder>{ 


List<Personne> personnes = Collections.emptyList(); 
Context context; 

Dialog dialog; 

public Recycler_View_Adapter(List<Personne> list, Context context) { 
    this.personnes = list; 
    this.context = context; 
} 

private Context getContext() { 
    return context; 
} 


@Override 
public View_Holder onCreateViewHolder(ViewGroup parent, int viewType) { 

    Context context = parent.getContext(); 
    LayoutInflater inflater = LayoutInflater.from(context); 

    View v = inflater.inflate(R.layout.row_layout, parent, false); 
    View_Holder holder = new View_Holder(v); 
    return holder; 
} 

@Override 
public void onBindViewHolder(View_Holder holder, final int position) { 



    holder.title.setText(personnes.get(position).nom_prenom); 
    //holder.description.setText("Etage N° : "+personnes.get(position).etage+" à "+personnes.get(position).date.toDateTime()); 
    holder.occurence.setText(personnes.get(position).occurence+"/"+personnes.get(position).NbrDeJour); 




    animate(holder); 

} 


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



@Override 
public void onAttachedToRecyclerView(RecyclerView recyclerView) { 
    super.onAttachedToRecyclerView(recyclerView); 
} 
public void animate(RecyclerView.ViewHolder viewHolder) { 
    final Animation animAnticipateOvershoot = AnimationUtils.loadAnimation(context, R.anim.bounce_interpolator); 
    viewHolder.itemView.setAnimation(animAnticipateOvershoot); 
} 

} 

Answer 1

setUserVisibleHintメソッドをオーバーライドすることで問題を解決できると思います。

フラグメントをユーザーが見ることができるかどうかを確認し、ダイアログを表示するためにrecyclerviewが空であるかどうかを確認するために、これをviewpagerの2番目のフラグメントに追加できます。

@Override 
public void setUserVisibleHint(boolean isVisibleToUser) { 
    super.setUserVisibleHint(isVisibleToUser); 

    if (this.isVisible()) { 

      if (i == 0 ){ 
      final NiftyDialogBuilder dialogBuilder=NiftyDialogBuilder.getInstance(this.getContext()); 
      dialogBuilder 
      .withTitle("Employé")         //.withTitle(null) no title 
      .withTitleColor("#FFFFFF")         //def 
      .withDividerColor("#11000000")        //def 
      .withMessage("Aucun employé à afficher")      //.withMessage(null) no Msg 
      .withMessageColor("#FFFFFFFF")        //def | withMessageColor(int resid) 
      .withDialogColor("#FFE74C3C")        //def | withDialogColor(int resid) 
      .withIcon(getResources().getDrawable(R.drawable.icon)) 
      .withDuration(700)           //def 
      .withEffect(Shake)           //def Effectstype.Slidetop 
      .withButton1Text("Retour")          //def gone 
      .withButton2Text("Annuler")         //def gone 
      .isCancelableOnTouchOutside(true)       //def | isCancelable(true) 
      //.setCustomView(R.layout.custom_view,v.getContext())   //.setCustomView(View or ResId,context) 
      .setButton1Click(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        dialogBuilder.cancel(); 
        Toast.makeText(v.getContext(), "Principale", Toast.LENGTH_SHORT).show(); 
        Intent intent = new Intent(getActivity(), MainActivity.class); 
        getActivity().startActivity(intent); 



       } 
      }) 
      .setButton2Click(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        //Toast.makeText(v.getContext(),"i'm btn2",Toast.LENGTH_SHORT).show(); 
        dialogBuilder.cancel(); 
       } 
      }) 
      .show(); 
      } 

    } 
}