数据没有显示在android中的SQLite列表视图中

I have successfully created a database and inserted data into it.However when retrieving the data and displaying it in a listview ,the data is not being displayed.I am unsure as to where my problem lies.I have researched in S/O and other tutorials but cannot seem to find what suits my code.The following is what i have tried:I have successfully created a database and inse