With the latest Firmware 1.0.10.11 upgrade, all apps can be interact with the Mi Band..
1. If you open up your Mi Fit and click on the top right and select Setting.
2. Then you'll see a new screen as below. Just click the icon to continue.
3. There is a new row which is "App notification".
Click on that will bring you the next screen.
4. Now you have 2 options. Click on the First selection "Turn on app notifications"
5. Now select the Mi Fit and give access to Mi Fit to all your notification.
6. Of source, the message warns that this will give Mi Fit for getting info on all your message and info then it can also perform tasks on your message. This could be quite dangerous if Mi Fit is not trustable. So you have to base on your own judgement on it. Once you decide to trust it, click Ok.
