NewPostDatabase.kt

@Database(entities = [NewPost::class], version = 1)
abstract class NewPostDatabase: RoomDatabase() {
    abstract fun newPostDao(): NewPostDao

     companion object {
        private var INSTANCE: NewPostDatabase? = null

        fun getInstance(context: Context): NewPostDatabase? {
            if (INSTANCE == null) {
                synchronized(NewPostDatabase::class) {
                    INSTANCE = Room.databaseBuilder(context, 
                    NewPostDatabase::class.java,
                    NewPostDatabase::class.java.simpleName).build()
                }
            }
            return INSTANCE
        }

        fun destroyInstance() {
            INSTANCE = null
        }
    }
}