Android :: Synchronization Handler - Initial Data To Setup Display Page

I'd like to start an activity with some initial data (passed through Extras) that sets up a display page, while I simultaneously make a network call to get the rest of the data. I thought I'd pass this new data to the activity as a message to the activity's handler. Now, my question is: how can I make sure that the activity has finished drawing the page and is ready to show the message data? The data might come from the cache, so I'm worried the message may land in the handler before the page is ready to display it. Is there a way to synchronize the page draw and the message handling? E.g., is it possible to suspend the looper till the page is ready? What's the preferred way of doing what I'm trying to do?