问题
What is the purpose of drawSelectorOnTop in a Spinner? Whether I set this flag to "true" or "false", I cannot see any difference.
Thanks
回答1:
Well, like the name says it displays the selector control on top of the contents of the Spinner.
Whether or not there will be visual differences will depend on the style/contents of the Spinner. This is an example.
You'll note that the selector control appears to be on top of the Spinner
回答2:
Spinner does NOT support android:drawSelectorOnTop, as it does not use a selector, from Romain Guy from Google
https://groups.google.com/forum/?fromgroups=#!topic/android-developers/c0OcLBrxsaU
来源：https://stackoverflow.com/questions/6460864/spinner-with-drawselectorontop