How to fetch data from firebase and put inside spinner

Question

I was trying to fetch data from firebase and put it inside a spinner, I just want name of the nodes to be displayed on the spinner drop-down , But the entire branch of node is displaying as a single item in drop down. Please help me to fix this Let me show you my Java code

package com.example.presence;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

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.ValueEventListener;

import java.util.ArrayList;

public class add_Attendance_Activity extends AppCompatActivity {
    Spinner spinner;
    ArrayList<String> list;
    ArrayAdapter<String> adapter;
    DatabaseReference href;
    ValueEventListener listener;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_attendance);
        href= FirebaseDatabase.getInstance().getReference("students");
        spinner=findViewById(R.id.spinner);
        list=new ArrayList<String>();
        adapter=new ArrayAdapter<>(this,R.layout.support_simple_spinner_dropdown_item,list);
        spinner.setAdapter(adapter);
        list.clear();
        fetchData();
        adapter.notifyDataSetChanged();
    }
    public void fetchData(){
        listener=href.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                for(DataSnapshot mydata: snapshot.getChildren()) {
                    list.add(mydata.getValue().toString());
                }
                adapter.notifyDataSetChanged();
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {

            }
        });
    }
}

Spinner Looks like this

first I want to know what field that you want put inside a spinner. Your problem is when get data — Fakhri Khairi, Feb 06 '22 at 07:34

score 0 · Answer 1 · answered Feb 06 '22 at 08:25

Use a POJO model instead of plain string to store your data in the array adapter.

You can use Gson to populate your model from the repository which you get data and in your POJO model, override toString() method and return whatever you want your spinner to show!

Kotlin version:

override fun toString(): String {
    return when (persianName != null) {
      true -> StringBuilder(name)
        .append(" (").append(persianName)
        .append(")").toString()
      else -> name
    }
  }

Java version:

@NonNull
  @Override
  public String toString() {
    return name + " " + supervisorname;
  }

How to fetch data from firebase and put inside spinner

1 Answers1