I like Android development. But you go off the beaten path and, well …
I’ve written some custom ListView objects that get rendered depending on what kind of device is needed for a home automation app I’m working on.
So far so bad.
Now you need to be able to turn that device on or off.
Tricky.
On the phone’s screen there is a button for every item displayed, each showing the correct value.
BUT … inside it reuses the object that has been created. I have attached listeners to the button that mean when you toggle it off or on it sends a message to the underlying device.
It does. But then it sends messages to ALL the devices of the same type, because I’ve attached the listeners to what is basically the same GUI over and over again. So it looks right on the screen, but underneath all that happened was things were set in the right order so they display correctly. Right at the end of the call chain it sets the value back just for fun.
OK – let’s get it to tell me the ID of whichever row was tapped and only allow commands to be sent to that device. Nope. The button has the focus and won’t tell it’s container there was a tap and I’ve tried all the suggestions google could find for me. So the listener doesn’t ever get fired.
I think I’m going to have to short circuit the views and create them by hand, so each is a separate object with its own button etc. defined with its own listeners.
List View is designed to work with thousands of elements of homogenous data that can be tapped on and treated as a unit. But actually, for the case where there’s only a few that might have other things on them, it just doesn’t work.
I’ll have another look on line tomorrow.
By the way – I’d lay money that iOS Table View has similar problems, before people start doing the fanboi thing.