Why does the Android recent apps list show black or transparent screenshots? [closed]

Question

Why do I commonly see blank or transparent screens for apps in my recent apps list? Is this a theming problem or a bug in the recent apps list?

Answer 1

I just checked that out myself and my assumption is, that it happens, when the app performs to many tasks in its UI thread and therefore the Activity is not "fully created". In my case I opened the facebook and the twitter app and quickly switched to the recent app mode. Since the data wasn't loaded entirely, Android wasn't able to display a screenshot. Cyril Mottier wrote a nice article about app startups and how to handle this very specific problem. You can read it here.