I am surprised that there is no Android Hidden Features post yet in the Hidden Features series that I've been tracking for a while now.
The Hidden Features series is great for people who are new to a certain language. It shows the ropes and certain valuable tricks, all in one place. I think it's a brilliant idea. Even experts sometimes find tricks they'd never heard about.
I am starting Android development and I'd love to hear about its hidden features, tips, tricks, and pitfalls.
So, here goes: what are some hidden features of Android?