[android-developers] Designing Help into Your App

I've been thinking about ways to integrate help into an app.

I wanted to see what other people have done.

http://developer.android.com/design/patterns/help.html

Context sensitive, at a minimum, per screen, and possibly point to certain buttons using a PopupWindow to point out something like "This button will . . . ".

What have you done and how well has it worked? I could imagine there are some frameworks or open source project already.

I've thought about using the following technologies.

• A bunch of formatted strings with basic tags in string tags.
  
• A webview in a non full screen activity, displaying one or many simply html files from the res folder (this can't be in assets - in needs to be localized).  
• A popupwindow, using showasDropDown, to anchor it to another view or button that I want the help to be related to. 

Nathan

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