In my Android application, I want a setting to be toggleable in it’s menu like the Dialer app does for speaker and mute. You can see a picture below:
http://www.isaacwaller.com/images/acall.png
You see how the Speaker, Mute and Hold options are toggle buttons – you can tap them again and they will toggle the green color. They may do this in a custom way, but I suspect it is a option (I tried setting the Checkable attribute).
It’s looks like this menu item is implemented as a custom view.
In the android source code you can take a look at com.android.phone.InCallMenuView.java to see how this is implemented.
It doesn’t look like it is part of the public API, but it looks pretty self-contained. If your project has a compatible license, you may be able to copy it into your project and use and modify it as you see fit.