Chapter 5Tracking Movement and User Responses
Everything we’ve done so far has been about presenting options to users. They authorize the app, and we show them cards and present menu items to them. This chapter is about what users don’t see but they interact with for a deeper experience. These are back-end services that are affected by changes in a user’s Glass state.
Back-end services in response to state changes are a common fixture in software applications. Imagine a case where you might consistently delete emails from the same address. With the subscription service, your Glassware can register to receive a notification of any timeline-item deletions. If a user deletes three emails from a given sender, that address is added to a spam list, ...
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