如何使用Google Fit Android API获取步数的数据来源？

I am trying to use Google Fit API to get step count in my app. But I am not getting any data source other than Location. How to get Data Source for step count? Its been more than 4 days I am stuck at this. Kindly help me with this. Thanks. Below is the code I am usingI am trying to use Google Fit API to get step c