> Add a help option menu choice to your PreferenceActivity.

Do you mean with long press on the entry or with the menu button?
Either way, there's the trouble Android doesn't signal whether these
options exist or not, and in a preference activity, most users won't
be looking for them. (I'd even bet most option menus in ListViews
generally are undiscovered by the majority of users unless there's a
big nag screen explaining them this feature exists or they
accidentally tap a bit too long...)
Alternative layouts with help button might be a solution, but I'm a
bit worried about compatibility with some devices and future Android
versions as well.

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