onRetainNonConfigurationInstance

gistfile1.txt

public Object onRetainNonConfigurationInstance() {
   return this;
}
Then in YourActivity's onCreate()

public void onCreate(Bundle savedState)
{
   YourActivity prevActivity = (YourActivity)getLastNonConfigurationInstance();
   if(prevActivity!= null) { 
       // So the orientation did change
       // Restore some field for example
       this.myValue = prevActivity.myValue;
   }
}