How to Delete Items from RecyclerView and Read from two children in Firebase

Question

Am new to android development am trying to figure out how to do two thing.

1. Use a close button to delete items from a RecyclerView and Firebase
2. Retrieve items from two children in a database. In my code I was able to retrieve from just one child (offer_Rides) but I will like to retrieve from another child called "Users".

public class WallActivity extends AppCompatActivity {


private Button ivClose;

private RecyclerView offerList;

private DatabaseReference mDatabase;

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

    mDatabase = FirebaseDatabase.getInstance().getReference().child("Offer_Rides");


    ivClose = (Button) findViewById(R.id.ivClose);
 //   ivClose.setOnClickListener((View.OnClickListener) this);


    offerList = (RecyclerView) findViewById(R.id.offerList);
    offerList.setHasFixedSize(true);
 offerList.setLayoutManager(new LinearLayoutManager(this));

}

@Override
protected void onStart() {
    super.onStart();

  FirebaseRecyclerAdapter<OfferPost, OfferPostViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<OfferPost, OfferPostViewHolder>(
          OfferPost.class,
          R.layout.offer_list_row,
          OfferPostViewHolder.class,
          mDatabase

          ){
      @Override
      protected void populateViewHolder(OfferPostViewHolder viewHolder, OfferPost model, int position) {
            viewHolder.setFirstname(model.getFirstname());
          viewHolder.setLastname(model.getLastname());
          viewHolder.setPhone(model.getPhone());
          viewHolder.setPrice(model.getPrice());
          viewHolder.setSeats(model.getSeats());
          viewHolder.setLocation(model.getLocation());
        viewHolder.setDestination(model.getDestination());
      }
  };

offerList.setAdapter(firebaseRecyclerAdapter); }

public static class OfferPostViewHolder extends RecyclerView.ViewHolder{

    View mView;
    public OfferPostViewHolder(View itemView) {
        super(itemView);

        mView = itemView;
    }

    public void setFirstname(String firstname){
        TextView post_firstname = (TextView) mView.findViewById(R.id.tvFirstname);
        post_firstname.setText(firstname);

    }
    public void setLastname(String lastname){
        TextView post_firstname = (TextView) mView.findViewById(R.id.tvLastname);
        post_firstname.setText(lastname);

    }
    public void setPhone(String phone){
        TextView post_phone = (TextView) mView.findViewById(R.id.tvPhone);
        post_phone.setText(phone);

    }
    public void setPrice(String price){
        TextView post_price = (TextView) mView.findViewById(R.id.tvCash);
        post_price.setText(price);

    }
    public void setSeats(String seats){
        TextView post_seats = (TextView) mView.findViewById(R.id.tvSeats);
        post_seats.setText(seats);

    }
    public void setLocation(String location){
        TextView post_location = (TextView) mView.findViewById(R.id.tvLocation);
        post_location.setText(location);

    }
    public void setDestination(String destination){
      TextView post_destination = (TextView) mView.findViewById(R.id.tvDestination);
    post_destination.setText(destination);

}

}

}

Answer 1

If you want to delete users values in firebase use this code

DatabaseReference databaseReference = firebaseDatabase.getReference().child("Users");
    databaseReference.removeValue();