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Google highlights Health Connect updates for user data in I/O segment
It'll give some more app convenience but only if the user approves.
History reads lets users grant access to another app so it can take in their "historical" Health Connect data, which includes information well beyond 30 days prior. The company is highlighting another string of updates that are primed for its Android health sector for users in a Developers blog post. Regarding the former, the post states that the developer-focused feature will give their app the ability to read Health Connect data when in the background.
Or read this on Android Central