Onkeydown what's the diference between return false and return super.onkeydown()?

Question

I put a list view inside a linearlayout,and I want to override onkeydown() method in ListView ,and I don't control the focus, just change some variables in onkeydown(),I want system do as if I haven't override the onkeydown method.what should I do?return false? or return super.onkeyDown()?.It will be very nice for any help. thank you in advance.

there are three listviews,and a b c are three item of listviews. when c is focused, when I press left arrow on keybord, then a get focus by default. And I want the first item in listview2 get focus how can I do?

Answer 1

ntc is not exactly correct. OS does not use reflection to get your base class' handler.

If you return false, you explicitly tell OS that you do not want to handle this event; OS calls the View's parent handler then (as your test shows); this happens until event got handled or top View is reached.

If you call super.OnKeyDown() you allow your base class to process event. Note that it's a base class' handler serving same view, not parent view; don't confuse here.

So, using one or the other depends on your view's behavior desired.

I supose in your case you need return super.onKeyDown();

Answer 2

super.onkeyDown()- this puts the burden on super class to handle the onKeyDown event by your own wish (You explicitly say to handle it). when you return false, android assumes that you have not handled the onKeyDown event and super.onKeyDown() gets called by default (without you calling it).