Android :: OAuth Instance State In Android

I'm trying to use OAuth in an Android app. I have it working correctly but have sometimes run into a problem during the authentication phase. In Android, I launch the browser for the user to login and authenticate. Then the callback url will redirect back to my application.

Here is the problem. My application has a OAuth consumer and provider as members of my main class. When the browser is launched for authentication, sometimes my main Activity is discarded to save memory. When the callback url relaunches my main Activity, the provider and consumer are new instances and therefor don't work when I try to make a request to the api. If the main Activiy was not freed during the authentication phase, then everything works correctly because I'm still working with the original consumer and provider.

I tried using onSaveInstanceState() and onRestoreInstanceState(), but haven't been successful. It seems the onRestoreInstanceState() is not called when my callback url is handled. Seems to go straight to the onResume().

What is the correct method for persisting the consumer and provider in this case?