過(guò)濾回收查看微調(diào)器與選定的學(xué)生類(lèi)？

我想根據(jù)在spinner上選擇的學(xué)生類(lèi)在RecyclerView上獲取項(xiàng)目。如果學(xué)生在RecyclerView中有rollno，name，class。我只想要第八名的學(xué)生e.g??I我在使用firebase Firestore。現(xiàn)在我有一個(gè)recyclerwiw，它獲取所有文檔（學(xué)生）和（name，rollNo，class）。

適配器的代碼是：公共類(lèi)ClasswiseAdapter擴(kuò)展RecyclerView.適配器<ClasswiseAdapter.studentViewHolder>{私有ArrayList類(lèi)列表；

public ClasswiseAdapter(ArrayList<ModelViewClasswise> classlist) {

    this.classlist = classlist;


}

@NonNull
@Override
public ClasswiseAdapter.studentViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.row_classwise,parent,false);
    return new ClasswiseAdapter.studentViewHolder(view);


}

@Override
public void onBindViewHolder(@NonNull studentViewHolder holder, int position) {

    holder.t1.setText(classlist.get(position).getName());
    holder.t2.setText(classlist.get(position).getClassName());
    holder.t3.setText(classlist.get(position).getRollNumber());


}







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


}




class studentViewHolder extends RecyclerView.ViewHolder{
    TextView t1,t2,t3;

    public studentViewHolder(@NonNull View itemView) {
        super(itemView);
        t1=itemView.findViewById(R.id.nameC);
        t2=itemView.findViewById(R.id.classC);
        t3=itemView.findViewById(R.id.rollNumC);

    }
}

}

學(xué)生類(lèi)視圖的代碼是：public class view classwise extends AppCompatActivity{

private static final String TAG = ViewClasswise.class.getSimpleName();

private RecyclerView recyclerViewCW;
ArrayList<ModelViewClasswise>classlist;
FirebaseFirestore db;
FirebaseAuth fAuth;
ClasswiseAdapter classwiseAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_view_classwise);

    recyclerViewCW = findViewById(R.id.recyclerviewCW);
    recyclerViewCW.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));

    recyclerViewCW.setLayoutManager(new LinearLayoutManager(this));
    classlist=new ArrayList<>();
    classwiseAdapter=new ClasswiseAdapter(classlist);
    recyclerViewCW.setAdapter(classwiseAdapter);

    db= FirebaseFirestore.getInstance();
    fAuth= FirebaseAuth.getInstance();
    FirebaseUser user = fAuth.getCurrentUser();
    db.collection("Schools").document(user.getUid()).collection("Students").get()
            .addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
                @Override
                public void onSuccess(QuerySnapshot queryDocumentSnapshots) {

                    List<DocumentSnapshot> list=queryDocumentSnapshots.getDocuments();

                    for(DocumentSnapshot d:list){

                        ModelViewClasswise obj=d.toObject(ModelViewClasswise.class);
                        classlist.add(obj);
                    }
                    //Update Adapter

                    classwiseAdapter.notifyDataSetChanged();
                }
            });



}

}