Create your Firebase Realtime database Calendar App to store events or reminders - Android 13 API 3

In this video it shows the steps to create your firebase database based Calendar App. This App can be used to store your reminders or events in your firebase database. Complete source code and other details/ steps of this video are posted in the below link: However, the main Java code is copied below also for reference: package com.programmerworld.firebasecalendarapp; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.CalendarView; import android.widget.EditText; 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; public class MainActivity extends AppCompatActivity { private CalendarView calendarView; private EditText editText; private String stringDateSelected; private DatabaseReference databaseReference; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); calendarView = findViewById(R.id.calendarView); editText = findViewById(R.id.editText); calendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() { @Override public void onSelectedDayChange(@NonNull...