ProfileRoomDatabase.java

package com.example.wagbaapplication;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;

import androidx.annotation.NonNull;
import androidx.room.Database;
import androidx.room.Room;
import androidx.room.RoomDatabase;
import androidx.sqlite.db.SupportSQLiteDatabase;

@Database(entities = {Profile.class}, version = 2, exportSchema = false)
public abstract class ProfileRoomDatabase extends RoomDatabase {

    public abstract ProfileDao profileDao();
    private static ProfileRoomDatabase INSTANCE;

    static ProfileRoomDatabase getDatabase(final Context context) {
        if (INSTANCE == null) {
            synchronized (ProfileRoomDatabase.class) {
                if (INSTANCE == null) {
                    INSTANCE = Room.databaseBuilder(context.getApplicationContext(),
                                    ProfileRoomDatabase.class, "profile_database")
                            // Wipes and rebuilds instead of migrating
                            // if no Migration object.
                            // Migration is not part of this practical.
                            .fallbackToDestructiveMigration()
                            .addCallback(sRoomDatabaseCallback)
                            .build();
                }
            }
        }
        return INSTANCE;
    }

    private static RoomDatabase.Callback sRoomDatabaseCallback =
            new RoomDatabase.Callback(){

                @Override
                public void onOpen (@NonNull SupportSQLiteDatabase db){
                    super.onOpen(db);
                }
            };

}