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In the app I’ve been working on, I would like to have a multiple-state (in my case, three) toggle button, instead of the two that ToggleButton provides. I’ve tried to start my own that extends Button, following the CompoundButton source, but quite honestly reading over its source got a bit overwhelming.
Is there a way to do a three-state toggle button using just a selector xml or something, or perhaps another method I haven’t thought of? I’m rather at a loss of how to do this.
You can certainly define a selector to use as a background that has three entries. The question is what button attributes you can use for the selector. You can have two boolean attributes, say A and B, and define the selector in terms of A, B, and default. (A && B will satisfy A, so more properly they could be thought of as A, !A && B, and !A && !B.) You can overload existing attributes (selected, focused, etc.) or, more elegantly, define your own custom attributes using the recipe described in this thread.