We want to develop an android application to support MiBand and Other Smart bands. We want to fetch information like Heart rate etc. from Smart Band via BLE and display it in a
I found this but it's on Chinese: https://dev.mi.com/docs/micloud/health/
There's also a huami tech GitHub repository which describes their API, You'll need to register your app with them through email it seems.
https://github.com/huamitech/rest-api/wiki