public void DeleteBookInfoList()
{
IList <AndroidJavaObject> bookInfoList = new List <AndroidJavaObject>();
BookInfo bookInfo1 = new BookInfo();
bookInfo1.Id = 2;
bookInfo1.Author = "Author 2";
bookInfoList.Add(bookInfo1.GetObj());
BookInfo bookInfo2 = new BookInfo();
bookInfo2.Id = 3;
bookInfo2.Author = "Author 3";
bookInfoList.Add(bookInfo2.GetObj());
cloudDBManager.ExecuteDelete(bookInfoList);
}