How to populate Spinner with Android Firebase Database

In this android programming source code example, we are going to populate Spinner with Android Firebase Database.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to populate Spinner with Android Firebase Database.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="15dp"
    android:background="#CACACA">

   <TextView
       android:id="@+id/txtsp"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="Spinner"
       android:textSize="20sp"
       android:layout_above="@id/spinner"
       android:gravity="center_horizontal"
       android:textColor="@color/colorAccent"/>
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

</RelativeLayout>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

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

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 java.util.ArrayList;
import java.util.List;

public class FirebaseActivity15 extends AppCompatActivity {
    private Spinner spinner;
    private DatabaseReference mDatabase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_firebase15);
        mDatabase = FirebaseDatabase.getInstance().getReference().child("AndroidView");
        spinner = (Spinner)findViewById(R.id.spinner);

        Query query = mDatabase.orderByChild("title");
        query.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                final List<String> titleList = new ArrayList<String>();
                for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren()){
                    String titlename = dataSnapshot1.child("title").getValue(String.class);
                    titleList.add(titlename);
                }
                ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(FirebaseActivity15.this, android.R.layout.simple_spinner_item, titleList);
                arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                spinner.setAdapter(arrayAdapter);
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
                Toast.makeText(FirebaseActivity15.this,databaseError.getMessage(),Toast.LENGTH_LONG).show();
            }
        });
    }
}

app/build.gradle

implementation 'com.google.firebase:firebase-core:16.0.9'
implementation 'com.google.firebase:firebase-database:17.0.0'

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