自动选中与数据库中的值对应的复选框

I am using a baseadapter for my customize spinner with checkbox that allow the user to choose multiple values. I have an update button in my application, and I need to set the values from the database as true in the checkbox. My problem is I don't know how to do it. For example I have ["A","B","C","D"] values in my spinner, in my database I got B and D. How will i automatically check that values when I open the activity. I am using a baseadapter for my customize spinn