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Let's say I have StaffAttendanceCheckIn.Java, if user click on the addOnItemTouchListener inside, i want to make it either show dialog or go to another page and show out the attendance record. For example if user clicked on the Event Name Google, it would show out the firebase record. After click inside it will show out filtering. If user choose Tuesday 06 Nov 2018, it will show out the check in date and check in time. I'm not sure how to write after onDataChange

StaffAttendanceCheckIn.Java

package com.example.edward.neweventmanagementsystem;



import android.app.AlertDialog;

import android.app.Dialog;

import android.content.DialogInterface;

import android.content.Intent;

import android.support.annotation.NonNull;

import android.support.design.widget.FloatingActionButton;

import android.support.v7.app.ActionBar;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import android.widget.Toast;



import com.bumptech.glide.Glide;

import com.example.edward.neweventmanagementsystem.Model.EventInfo;

import com.example.edward.neweventmanagementsystem.ViewHolder.MenuViewHolder;

import com.firebase.ui.database.FirebaseRecyclerAdapter;

import com.firebase.ui.database.FirebaseRecyclerOptions;

import com.google.android.gms.tasks.OnCompleteListener;

import com.google.android.gms.tasks.Task;

import com.google.firebase.auth.FirebaseAuth;

import com.google.firebase.auth.FirebaseUser;

import com.google.firebase.database.DataSnapshot;

import com.google.firebase.database.DatabaseError;

import com.google.firebase.database.DatabaseReference;

import com.google.firebase.database.FirebaseDatabase;

import com.google.firebase.database.Query;

import com.google.firebase.database.ValueEventListener;

import com.google.firebase.storage.FirebaseStorage;

import com.google.firebase.storage.StorageReference;



public class StaffAttendanceRecordTable extends AppCompatActivity {



    FirebaseDatabase database;

    DatabaseReference eventInfo;

    FloatingActionButton search_item;

    RecyclerView recycle_menu;

    RecyclerView.LayoutManager layoutManager;

    FirebaseRecyclerAdapter <EventInfo, MenuViewHolder> adapter;

    private DatabaseReference mDatabaseReference;

    private TextView EventName;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_staff_attendance_record_table);



        recycle_menu = (RecyclerView) findViewById(R.id.recycle_menu);

        recycle_menu.setHasFixedSize(true);

        layoutManager = new LinearLayoutManager(this);

        recycle_menu.setLayoutManager(layoutManager);



        mDatabaseReference = FirebaseDatabase.getInstance().getReference().child("AttendanceRecord");



        recycle_menu.setLayoutManager(layoutManager);



        search_item = (FloatingActionButton) findViewById(R.id.search_item);



        FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser() ;

        eventInfo = FirebaseDatabase.getInstance().getReference().child("ListOfEvent").child(currentFirebaseUser.getUid());



        loadMenu();



        recycle_menu.addOnItemTouchListener(

                new RecyclerItemClickListener(getBaseContext(), recycle_menu ,new RecyclerItemClickListener.OnItemClickListener() {

                    @Override public void onItemClick(View view, int position) {







                        mDatabaseReference.addListenerForSingleValueEvent(new ValueEventListener() {

                            @Override

                            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {



                                EventName = (TextView) findViewById(R.id.RegisterEventName);

                                if(dataSnapshot.child(EventName.getText().toString()).exists()){

                                    Toast.makeText(StaffAttendanceRecordTable.this, "Got Result", Toast.LENGTH_SHORT).show();



                                    Intent intent =  new Intent(StaffAttendanceRecordTable.this, com.example.edward.neweventmanagementsystem.attendanceListMainList.class);

                                    startActivity(intent);







                                }else{

                                    Toast.makeText(StaffAttendanceRecordTable.this, "No Result", Toast.LENGTH_SHORT).show();

                                }

                            }



                            @Override

                            public void onCancelled(@NonNull DatabaseError databaseError) {



                            }

                        });



                    }



                    @Override public void onLongItemClick(final View view, int position) {







                    }

                })

        );



        search_item.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Intent search = new Intent(StaffAttendanceRecordTable.this, Find_Event.class);

                startActivity(search);

                System.out.println("Testing search Item");

            }

        });

    }



    public void loadMenu(){

        Query query = eventInfo.orderByKey();

        FirebaseRecyclerOptions firebaseRecyclerOptions = new FirebaseRecyclerOptions.Builder<EventInfo>().setQuery(query, EventInfo.class).build();

        adapter = new FirebaseRecyclerAdapter<EventInfo, MenuViewHolder>(firebaseRecyclerOptions) {

            @NonNull

            @Override

            public MenuViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

                View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.activity_list,viewGroup,false);

                return new MenuViewHolder(view);

            }



            @Override

            protected void onBindViewHolder(@NonNull MenuViewHolder holder, int position, @NonNull EventInfo model) {



                holder.txtRegisterEventId.setText(model.getRegisterEventId());

                holder.txtRegisterEventStartDate.setText(model.getRegisterEventStartDate());

                holder.txtRegisterEventName.setText(model.getRegisterEventName());

                holder.txtRegisterContactNumber.setText(model.getRegisterContactNumber());

                holder.txtRegisterEventRadiogroup.setText(model.getRegisterEventRadiogroup());

                holder.txtRegisterEventLocation.setText(model.getRegisterEventLocation());





                holder.txtEventPrice.setText(model.getEventPrice());

                holder.txtEventCapacity.setText(model.getEventCapacity());



                holder.fileName.setText(model.getFileName());



                //Picasso.with(getBaseContext()).load(model.getImageToUpload()).into(viewHolder.imageView);

                //Glide.with(getBaseContext()).load(model.getImageToUpload()).into(viewHolder.imageView);



                Glide.with(getBaseContext()).load(model.getImageToUpload()

                ).into(holder.imageView);

                System.out.println(model.getRegisterEventName());

                System.out.println(model.getImageToUpload());

            }



        };

        recycle_menu.setAdapter(adapter);

    }



    @Override

    protected void onStart() {

        super.onStart();

        adapter.startListening();

    }



    @Override

    protected void onStop() {

        super.onStop();

        adapter.stopListening();

    }

}

As you said when clicked on addOnItemTouchListener then you want to fetch all events.

You can use this code. Little modified your code.

Using this code you will get All Event Names inside Attendance Record,

    recycle_menu.addOnItemTouchListener(

            new RecyclerItemClickListener(getBaseContext(), recycle_menu ,new RecyclerItemClickListener.OnItemClickListener() {

                @Override public void onItemClick(View view, int position) {



                    DatabaseReference mDatabaseReference;



                    mDatabaseReference.addListenerForSingleValueEvent(new ValueEventListener() {

                        @Override

                        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                            ArrayList<String> eventNames = new ArrayList<>();



                            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {



                                eventNames.add(snapshot.getKey());



                                //Now you have all Event Names in List

                                // you can show them in a Custom Alert Dialog

                                //Or pass it to next Activity.



                            }



                            EventName = (TextView) findViewById(R.id.RegisterEventName);

                            if(dataSnapshot.child(EventName.getText().toString()).exists()){

                                Toast.makeText(StaffAttendanceRecordTable.this, "Got Result", Toast.LENGTH_SHORT).show();



                                Intent intent =  new Intent(StaffAttendanceRecordTable.this, com.example.edward.neweventmanagementsystem.attendanceListMainList.class);

                                startActivity(intent);







                            }else{

                                Toast.makeText(StaffAttendanceRecordTable.this, "No Result", Toast.LENGTH_SHORT).show();

                            }

                        }



                        @Override

                        public void onCancelled(@NonNull DatabaseError databaseError) {



                        }

                    });



                }



                @Override public void onLongItemClick(final View view, int position) {







                }

            })

    );

Lets say you have displayed these codes in your Activity/Alert Dialog and user clicked on any event.

You can fetch all days inside that event using below code.

    databaseReference.child("clicked_item").addListenerForSingleValueEvent(new ValueEventListener() {

        @Override

        public void onDataChange(DataSnapshot dataSnapshot) {

            ArrayList<String> eventDays = new ArrayList<>();



            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {



                eventDays.add(snapshot.getKey());



                //Now you have all days that exist inside Clicked Item (Google)

                //Same as previous you can show them in Alert Dialog or New Activity,



            }



        }



        @Override

        public void onCancelled(DatabaseError databaseError) {



        }

    });

The Last part.. As you have all the Days and you have displayed these days to user and User clicked on any day.

Now you want to fetch checkInDate & checkInTime. you can use below code to fetch this data.

    databaseReference.child("clciked_Day").addListenerForSingleValueEvent(new ValueEventListener() {

        @Override

        public void onDataChange(DataSnapshot dataSnapshot) {



            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {



                String checkInDate = snapshot.child("checkInDate").getValue().toString();

                String checkInTime = snapshot.child("checkInTime").getValue().toString();



            }

        }



        @Override

        public void onCancelled(DatabaseError databaseError) {



        }

    });

Hope this will help you !!