Every time you unlock your display a Chinese word will pop up in your notifications. As a recent study pointed out that every user unlocks the display about 60 times - that's going to be about 60 vocabularies you might learn a day.

Using this app you can learn without hassle. Unlock 'n' learn. With this version you can learn Chinese.

This is only a trial version with 30 words. If you like the app, take a look at the other versions.