sentry-java

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Description

In the light of #1810, we're still not really there yet with the Manual Screens API and only-spans, so this might be a interim solution to support single-activity apps and create transactions bound to scope automatically for our fragment integration. This has several tricky things to figure out:

• What is considered a screen when fragments are used?
  • If androidx.navigation is used we could use our integration to create transaction whenever a route changes
  • otherwise we could by default always create transaction and then provide a lambda/function to customize this behavior (e.g. shouldCreateTx: (Fragment) -> Boolean
• If there's an active Activity transaction, should we keep it or should we replace it with the Fragment one?
  • I think we should keep it and make the fragment integration create a span instead
• Should inherit most of the behavior from the ActivityLifecycleIntegration, so it would makes sense to commonize that code
  • TTID/TTFD
  • ...
• ViewPager?