Google has updated us on total Android activations to kick off today’s Google I/O keynote. What stood at just over 100 million total activations last year has grown four times to surpass the 400 million mark. This is in no small part thanks to the 1 million activations a day Android is experiencing. Tremendous growth for the platform considering that three years ago it barely held any stake in the smartphone market. Today it is the number one smartphone operating system in the world.