This handwriting input works similar to texting on your android device. To use the app, users have to download the language which will be used often, select that as a input mode and it is done.
"Entering text on mobile devices is still considered inconvenient by many; touchscreen keyboards, although much improved over the years, require a lot of attention to hit the right buttons. Voice input is an option, but there are situations where it is not feasible, such as in a noisy environment or during a meeting."
He further added, "Using handwriting as an input method can allow for natural and intuitive input method for text entry which complements typing and speech input methods," wrote Google Research team in a blog post."
"By building on large-scale language modeling, robust multi-language OCR, and incorporating large-scale neural-networks and approximate nearest neighbor search for character classification, Google Handwriting Input supports languages that can be challenging to type on a virtual keyboard," noted Google Research team.
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Apart from the 82 languages, this Google handwriting Input also supports emojis, so that it gets added, when you draw it on the screen. And also, users don't need to have internet connection to use the input method.