问题
I see the documentation says this method returns the position of the given item, but what would it return if no such item exists in the ArrayAdapter?
回答1:
After looking through the source code I've found that the ArrayAdapter uses List.indexOf(Object) to find the object and this method returns -1 when it doesn't exist.
GrepCode is awesome for finding stuff when the documentation is bad, I use it at least once a day :)
Source: GrepCode
来源：https://stackoverflow.com/questions/6715222/arrayadapter-getpositionitem-returns-what