Share a WebView between activities
<p>I've written an iOS app that I want to port to android.  This app is a 
front-end for a web-based timekeeping system at work.  Unfortunately, 
the system doesn't have an API, so I'm screen-scraping it using xpath 
queries in javascript.  In iOS, I only have to load this page once 
because I get full control over when instances of my UIWebView get 
destroyed. 
iOS app only has 3 use cases, each which break into separate Android 
activities: 
Login 
View a list of all reported times 
Report a new time. 
Using a naive approach, my android views (including the WebView I need 
to use to interact with the timekeeping system) will be destroyed and 
recreated when I switch between views.  If I have to reload the 
WebView every time I switch activities, my app will appear very slow. 
Is it possible to share a WebView instance between multiple 
activities?  I know I can set the launchMode to singleInstance, but 
ideally, it would be nice to allow separate instances so that the back 
button would function normally. </p>
