One change in the program:
delete_database.setOnClickListener {
if(checkDataBase()){
if(myDataBase != null) {
myDataBase!!.close()
}
this.deleteDatabase(FeedReaderContract.DATABASE_NAME)
showToast("${FeedReaderContract.DATABASE_NAME} deleted")
}else{
showToast("${FeedReaderContract.DATABASE_NAME} doesn't exist")
}
}