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So what is the recommendation on where to observe LiveData? onViewCreated? Because at one point, the docs were using onActivityCreated.

Re #2 - They're called back to back, so they'd be equally valid (for a Fragment with a View).

Project: platform/frameworks/support
Branch: androidx-master-dev

commit d3c7e85f798b804ef66da955f79f2d162aa20452
Author: Jeremy Woods <jbwoods@google.com>
Date:   Tue Dec 17 11:27:36 2019

    Ensure StrictFragment does not ascend state with destroyed activity
   
    Added a check to make sure that when a StrictFragment is going up in
    state, its activity is not destroyed. Put checks in onCreateView and
    onCreatedView of StrictViewFragment too.
   
    Test: all tests pass
    BUG: 144309266
    Change-Id: Iefe2031c0c40ba603dd83d257a255bf5df278dc3

M       fragment/fragment/src/androidTest/java/androidx/fragment/app/StrictViewFragment.kt
M       testutils/testutils-runtime/src/main/java/androidx/fragment/app/StrictFragment.kt

https://android-review.googlesource.com/1193030

Project: platform/frameworks/support
Branch: androidx-master-dev

commit c03c0e0ebfaca4b1b342dad0270489107ea4c73d
Author: Jeremy Woods <jbwoods@google.com>
Date:   Tue Dec 17 11:35:33 2019

    Change FragmentFinishEarlyTest to use StrictFragment
   
    The goal of the FragmentFinishEarlyTest is to ensure that the Fragment
    state is not raised while the activity is being destroyed.
    StrictFragment now checks if the activity is being destroyed in all of
    the upward states (onCreate, onStart, etc.) so we should just use that
    instead of a custom Fragment with booleans.
   
    Test: all tests pass
    BUG: 144309266
    Change-Id: Ic47a178c50bcbba246b91e2e25d969dd6931d765

M       fragment/fragment/src/androidTest/java/androidx/fragment/app/FragmentFinishEarlyTest.kt

https://android-review.googlesource.com/1193089

Project: platform/frameworks/support
Branch: androidx-master-dev

commit 3d9b247656fd46ebd17b1cd9743e163afe85f3d6
Author: Ian Lake <ilake@google.com>
Date:   Thu Jan 09 11:15:06 2020

    Remove most usages of onActivityCreated()
   
    Update demos and tests to use onViewCreated()
    instead of onActivityCreated().
   
    Test: ./gradlew bOS
    BUG: 144309266
    Change-Id: Icc0d43554f014c42db1068dfe6410cc191e21818

M       fragment/fragment/src/androidTest/java/androidx/fragment/app/LoaderTest.kt
M       samples/Support4Demos/src/main/java/com/example/android/supportv4/app/FragmentLayoutSupport.java
M       samples/Support4Demos/src/main/java/com/example/android/supportv4/app/FragmentListArraySupport.java
M       samples/Support4Demos/src/main/java/com/example/android/supportv4/app/FragmentPagerSupport.java
M       samples/Support4Demos/src/main/java/com/example/android/supportv4/app/FragmentStatePagerSupport.java
M       samples/Support4Demos/src/main/java/com/example/android/supportv4/app/LoaderCursorSupport.java
M       samples/Support4Demos/src/main/java/com/example/android/supportv4/app/LoaderCustomSupport.java
M       samples/Support4Demos/src/main/java/com/example/android/supportv4/app/LoaderThrottleSupport.java

https://android-review.googlesource.com/1203332

  The following changes were cherrypicked through Coastguard (https://android-build.googleplex.com/coastguard/)
  Release Track: (https://android-build.googleplex.com/coastguard/dashboard/6552735953321984/#/history/all)
  Created: 2020-01-23 18:46:39.416435+00:00
  Changes: aosp/1193030