Google started I/O 2012 event with the number of total Android activation. Last year at Google I/O 2011 event, Android had got 100 million activation, now at Google I/O 2012, the number has increased four times to 400 million.
Google also announced the increase of Android daily activation. One year ago, about 400,000 Android devices are activated in a day, now there are 1 million Android devices activated everyday.
Android has got over 20 billion app installs. Now, there are more than 600,000 apps and games on Play Store.
Three years ago, while Symbian was leading the smartphone operating system market, Android is not a popular smartphone OS. The popularity of Android has been increasing rapidly since the launch of Android 2.2 Froyo