ADFA-5199: Stop the template blink animator when its view stops - #1823
ADFA-5199: Stop the template blink animator when its view stops#1823itsaky-adfa wants to merge 8 commits into
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No behaviour change. The Spotless ratchet is file-level rather than line-level, so the one-line fix in the next commit puts this whole 4-space-indented file under the formatter. Kept separate so that fix stays reviewable; read this one with `git show -w`.
The scroll-indicator blink repeats forever, and the existing cancel() in onDestroyView never ran: activity_main.xml declares this fragment with android:name on a FragmentContainerView, so it is created during setContentView on every launch whether or not the template screen is ever visited, and opening the editor only stops MainActivity rather than destroying it. A GONE container and an invisible indicator do not stop an animator either. Animators do not pause when their activity stops, and AnimationHandler is per-main-thread and process-global, so the blink kept re-posting a vsync callback on the thread the editor runs on, producing no draws and burning main thread time for the life of the process. Measured at 81 main plus 21 Jit ticks per 20 s on an otherwise idle editor, which is exactly what it costs while legitimately visible. Tying it to viewLifecycleOwner leaves it running whenever the screen can be seen and stops it otherwise.
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WalkthroughThe fragment now controls scroll-indicator blinking through view lifecycle, screen state, and indicator visibility. It prevents duplicate animators, stops animation during cleanup, resets indicator alpha, and adds condition and lifecycle tests. ChangesTemplate indicator lifecycle
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant ViewLifecycle
participant TemplateDetailsFragment
participant ScrollIndicator
ViewLifecycle->>TemplateDetailsFragment: view starts or stops
TemplateDetailsFragment->>ScrollIndicator: evaluate screen and visibility
TemplateDetailsFragment->>ScrollIndicator: start or stop animator
Suggested reviewers: Merge Risk: 🔵 Low · up to The lifecycle change is covered, but the new test can leave its Koin binding in a shared test context and affect later tests. Resolve the test isolation concern before merge or accept the bounded test-suite risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In
`@app/src/main/java/com/itsaky/androidide/fragments/TemplateDetailsFragment.kt`:
- Line 98: Document the required font-scale verification for
TemplateDetailsFragment by adding screenshots or a PR note confirming the UI was
checked at font scales 1.0 and 2.0.
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app/src/main/java/com/itsaky/androidide/fragments/TemplateDetailsFragment.kt
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| setupTooltips() | ||
| setupObservers() | ||
| setupClickListeners() | ||
| viewLifecycleOwner.lifecycle.addObserver(blinkWhileStarted) |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
🔎 Supported by static analysis
🤖 get_repo_knowledge executed:
get_repo_knowledge appdevforall/CodeOnTheGo /tmp/coderabbit-repo-knowledge/appdevforall-codeonthego-5165177f/conventions /tmp/coderabbit-repo-knowledge/appdevforall-codeonthego-5165177f/learnings
Length of output: 45353
🏁 Script executed:
#!/bin/bash
set -eu
printf '%s\n' '--- tracked files related to TemplateDetailsFragment ---'
git ls-files | grep -E '(^|/)TemplateDetailsFragment\.kt$|(^|/)(README|CHANGELOG|CONTRIBUTING|PULL_REQUEST_TEMPLATE).*' || true
printf '%s\n' '--- fragment source around the changed registration ---'
file=$(git ls-files | grep -E '(^|/)TemplateDetailsFragment\.kt$' | head -n1)
if [ -n "${file:-}" ]; then
nl -ba "$file" | sed -n '1,180p'
fi
printf '%s\n' '--- repository text mentioning font scale or screen verification ---'
rg -n -i --glob '!**/build/**' --glob '!**/.gradle/**' 'font scale|font size|screenshots at|device verification|screen verification' . || trueRepository: appdevforall/CodeOnTheGo
Length of output: 13616
🏁 Script executed:
#!/bin/bash
set -eu
printf '%s\n' '--- recent commit summary and changed paths ---'
git show --stat --oneline --decorate -1
printf '%s\n' '--- current worktree diff summary ---'
git diff --stat
printf '%s\n' '--- repository files that could contain PR verification records ---'
git ls-files | grep -E '(^|/)(docs?|\.github|README|CHANGELOG|CONTRIBUTING|PULL_REQUEST_TEMPLATE)' | head -200 || trueRepository: appdevforall/CodeOnTheGo
Length of output: 9032
Record the required font-scale verification.
Add screenshots or a PR note that states what was checked at font scales 1.0 and 2.0 for TemplateDetailsFragment.
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In `@app/src/main/java/com/itsaky/androidide/fragments/TemplateDetailsFragment.kt`
at line 98, Document the required font-scale verification for
TemplateDetailsFragment by adding screenshots or a PR note confirming the UI was
checked at font scales 1.0 and 2.0.
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Source: Coding guidelines
A started view lifecycle is not visibility here. activity_main.xml declares every one of MainActivity's screens as a sibling container in one FrameLayout and onScreenChanged swaps them by View visibility, so this fragment's view reaches STARTED at cold start and stays there for as long as MainActivity is started. Tying the blink to the view lifecycle alone therefore left it running through the whole project-list session of a user who never opened the new-project flow, re-posting a vsync callback per frame with nothing drawn. The indicator also hides itself once the form has been scrolled to the bottom, which is a third way for it to be off screen while this is the current screen, and nothing cancelled the animator for that either. shouldBlinkScrollIndicator takes all three inputs, and is driven from the view lifecycle observer, a currentScreen observer and updateFinishEnabledState. It is a top-level function so the decision is unit-testable without standing a fragment up; the three call sites that feed it are not pinned by any test. Also moves the onDestroyView teardown above super. FragmentWithBinding nulls _binding before calling up, so a stop placed after it cannot touch the binding at all. Nothing was broken by that -- the view lifecycle dispatches ON_STOP before onDestroyView, so the reset had already run -- but the call was dead where it sat, and detaching the scroll gatekeeper before the view comes down makes the viewTreeObserver still-alive check hold by construction rather than by luck.
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Review of the blink-animator fix. The core change holds up — see the three inline notes for one medium (test coverage) and two low findings.
The predicate test could not go red against the pre-fix code: shouldBlinkScrollIndicator is new in this PR. Standing the fragment up under Robolectric does, so the two wiring call sites are now pinned - both cases fail on the pre-fix fragment with the animator still alive.
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Inline comments:
In
`@app/src/test/java/com/itsaky/androidide/fragments/TemplateDetailsBlinkLifecycleTest.kt`:
- Line 67: Update the existing GlobalContext branch in
TemplateDetailsBlinkLifecycleTest to retain the test module binding returned or
used by existing.loadModules(listOf(binding)), then unload that same binding in
tearDown() via existing.unloadModules(listOf(binding)). Ensure cleanup is
limited to this branch and occurs after each test.
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ℹ️ Review info
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📒 Files selected for processing (3)
app/src/main/java/com/itsaky/androidide/fragments/TemplateDetailsFragment.ktapp/src/test/java/com/itsaky/androidide/fragments/ScrollIndicatorBlinkTest.ktapp/src/test/java/com/itsaky/androidide/fragments/TemplateDetailsBlinkLifecycleTest.kt
🚧 Files skipped from review as they are similar to previous changes (2)
- app/src/test/java/com/itsaky/androidide/fragments/ScrollIndicatorBlinkTest.kt
- app/src/main/java/com/itsaky/androidide/fragments/TemplateDetailsFragment.kt
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Second pass on bc6fc2c0. I re-checked every round-1 thread against the code at head rather than against the replies, and re-ran the PR body's verification claims locally.
MINOR
TemplateDetailsBlinkLifecycleTest.kt:79- nothing pins that the blink comes back
NITPICK - 3: two inline, one as a reply on the existing Koin thread.
Round 1 re-check
- The test pins the predicate, not the fix (
ScrollIndicatorBlinkTest.kt:37) - fixed, verified independently. I ranTemplateDetailsBlinkLifecycleTestagainst014aa5801withScrollIndicatorBlinkTestmoved aside. Both cases fail there,expected: null but was: ObjectAnimator@..., target ...app:id/scrollIndicator alpha: 1.0 0.2 1.0, which is the message the reply quoted. Against head all 7 cases across the two classes pass. @VisibleForTestingon production logic (TemplateDetailsFragment.kt:297) - fixed. Neither the annotation nor its import survives at head;shouldBlinkScrollIndicatoris plaininternal.- The teardown comment asserts an invariant that does not hold (
TemplateDetailsFragment.kt:100) - fixed. Both halves of the reworded comment check out:FragmentWithBinding.onDestroyViewdoes null_bindingbefore calling up, so the call does have to precedesuper, and the observer is now named as the guarantee. - The PR body cited a task that does not compile
app/src/test- fixed.:app:testV7DebugUnitTestis the right task. I ran it andspotlessCheck; both green. - coderabbit's font-scale record - addressed. The PR body carries the one-line opt-out with a reason, which REVIEW.md section 8 allows for a change with no visual surface. The diff touches no XML, dimension or text property.
- coderabbit's Koin
unloadModules(TemplateDetailsBlinkLifecycleTest.kt:67) - still open. Replied in thread; nitpick, and it copies an existing repo precedent.
Evidence ledger
| Area | Result |
|---|---|
| Ticket completeness | Cause 2 only, by design and stated. See merge readiness below. |
| Sibling sweep | repeatCount = INFINITE occurs once in app code, here. The six other fragments declared beside this one in activity_main.xml use only viewLifecycleOwner.lifecycleScope, so this was the sole process-lifetime offender among them. |
| Central claim | activity_main.xml:54-56 does declare TemplateDetailsFragment by android:name, so it is built during setContentView. |
| Leaks | The observer and both LiveData observers are scoped to viewLifecycleOwner; the animator field is nulled on every stop. No new register without a matching unregister. |
| Threading / StrictMode | No new I/O or compute; the change only moves when an existing animator starts. |
| Security | Not applicable, no untrusted input. |
| Tests | 7 cases, 5 on the predicate and 2 on the wiring; red-proof reproduced. Gap noted as the MINOR. |
| Commit 1 | Formatter output only: ktlint import reordering, trailing commas and wrapping. No statement changed. |
| A11y / font scale | No new interactive views, no layout change. Opt-out valid. |
| CI | 4 checks, all green. |
Merge readiness, outside the diff
ADFA-5199's Steps to QA ask QA to confirm idle CPU is "far below 19 ticks/sec" and that the memory chart still renders and updates. This PR fixes cause 2 only, and the inferred figure for cause 2 alone is about 7 ticks/sec, so QA running those steps against this build will not get a clean pass and step 4 tests a surface this PR never touches. Keeping ADFA-5199 open is the right call; the Steps to QA field needs splitting, or cause 1 needs its own ticket, before this moves to QA. Not a defect in the change, and not anchorable to the diff.
Verdict
COMMENT. The one confirmed MINOR is a coverage gap, not a merge blocker. I traced every start and stop path in the new state machine and could not fault the code itself.
| } | ||
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| @Test | ||
| fun `blink stops when the view lifecycle stops`() { |
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MINOR: nothing pins that the blink comes back, which is half of what this change decided to do.
Both cases stop something and assert the animator is gone. Observing START/STOP rather than cancelling once exists so the blink returns when the screen does, and nothing covers the return. Concretely: drop the updateBlinkState() call from blinkWhileOnScreen.onStart while keeping isViewStarted = true. Both cases here stay green, because showTemplateDetails starts the blink through the currentScreen observer and onStop still stops it. The user now gets an indicator that never blinks again after backgrounding the app, with no crash and no log to catch it.
I confirmed the restart itself works: controller.start().resume() plus an isRunning assert passes against head. Three lines in the stop case closes the gap.
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Confirmed and fixed in eccffae2e. The stop case now restarts the view and asserts the animator is running again; renamed to blink stops when the view lifecycle stops and returns when it starts.
Red-proof against your exact mutation - updateBlinkState() dropped from blinkWhileOnScreen.onStart, isViewStarted = true kept:
blink stops when the view lifecycle stops and returns when it starts
expected: true
but was : null
at ...TemplateDetailsBlinkLifecycleTest.kt:94
2 tests completed, 1 failed
Only the stop case goes red; blink stops when another screen becomes current stays green under the mutation, which is the point you made. Restored, and all 7 cases across the two classes pass again.
| * This call is a no-op belt-and-braces for a teardown that skipped the observer; it still has | ||
| * to precede super, since FragmentWithBinding.onDestroyView nulls _binding before calling up. | ||
| */ | ||
| stopBlinkingIndicator() |
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NITPICK: the belt-and-braces teardown is half-done, since isViewStarted is left true.
The comment above says this call covers "a teardown that skipped the observer". On exactly that path the animator is cleared but the flag is not, so it survives into the next onViewCreated and any updateBlinkState() before the new ON_START would read a started view that is not started. Nothing reaches that window today: the LiveData observers are inactive below STARTED and TemplateScrollGateKeeper.attach() does not fire its callback. So this is symmetry, not a bug.
Setting isViewStarted = false beside the call makes the fallback do what the comment claims for it.
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Confirmed - isViewStarted = false now sits beside the call in 32f4ac5e4, so the fallback does what the comment claims. Comment reworded to cover both statements rather than just the stop.
Agreed it is unreachable today, for the two reasons you name.
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| private fun startBlinkingIndicator() { | ||
| if (blinkAnimator != null) { |
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NITPICK: this guard treats "an animator object exists" as "an animator is running".
ObjectAnimator holds its target in a WeakReference and self-cancels once the target is collected, which would leave the field non-null and permanently stopped and make every later startBlinkingIndicator() a silent no-op for the life of the view. It cannot happen here, because the binding pins the indicator for as long as the animator can live and stopBlinkingIndicator is the only other terminator.
The check that matches the intent costs nothing:
| if (blinkAnimator != null) { | |
| if (blinkAnimator?.isStarted == true) { |
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Taken in 32f4ac5e4: if (blinkAnimator?.isStarted == true). Equivalent today, since start() runs inside the apply before the field is assigned and an INFINITE animator stays started until cancel(), but it is the check that matches the guard's intent.
All 7 cases still pass and spotlessCheck is green.
Observing START/STOP rather than cancelling once exists so the blink comes back when the screen does, and no case covered the return: dropping updateBlinkState() from blinkWhileOnScreen.onStart left both cases green while the indicator never blinked again after a backgrounding. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The onDestroyView fallback cleared the animator but left isViewStarted true, so a teardown that skipped the observer carried a started flag into the next onViewCreated. Unreachable today, since the LiveData observers are inactive below STARTED and TemplateScrollGateKeeper.attach() fires no callback. startBlinkingIndicator() treated a non-null animator as a running one. ObjectAnimator self-cancels once its weakly held target is collected, which would leave the field non-null and permanently stopped. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2 participants
Jira: ADFA-5199
What
Runs
TemplateDetailsFragment's scroll-indicator blink only while the indicator can actually be seen.The blink is an
ObjectAnimatoronView.ALPHAwith anINFINITErepeat count. The fragment already calledcancel()inonDestroyView, but that never ran:activity_main.xmldeclares the fragment withandroid:nameon aFragmentContainerView, so it is created duringsetContentViewon every launch whether or not the template screen is ever visited, and opening the editor only stopsMainActivityrather than destroying it. AGONEcontainer and an invisible indicator do not stop an animator either.Animators do not pause when their activity stops, and
AnimationHandleris per-main-thread and process-global, so the blink kept re-posting a vsync callback on the same thread the editor runs on - producing no draws and burning main-thread time for the life of the process. Measured at 81 main plus 21 Jit ticks per 20 s on an otherwise idle editor, which is what it costs while legitimately visible.A started view lifecycle is not on its own a proxy for visibility.
activity_main.xmldeclares every one of MainActivity's screens as a sibling container in oneFrameLayoutand swaps them byViewvisibility, so this fragment's view reachesSTARTEDat cold start and stays there for as long as MainActivity is started - including a whole session spent on the project list. The indicator also hides itself once the form has been scrolled to the bottom. SoshouldBlinkScrollIndicatortakes all three inputs (view started, this screen current, indicator visible) and is re-evaluated from the view-lifecycle observer, acurrentScreenobserver andupdateFinishEnabledState.Observing
START/STOPrather than cancelling once means the blink comes back when the screen does.stopBlinkingIndicatoralso resets alpha to 1, because cancelling mid-repeat leaves the indicator at whatever alpha it had reached.Scope: this is one of ADFA-5199's two causes
ADFA-5199 has two independent causes of the idle CPU. This PR fixes the second one only.
The first - the memory-usage widget sampling and redrawing while completely covered - is not here.
MemoryUsageWatcherandBaseEditorActivitywere rewritten on the way to stage by ADFA-5530 (#1812), which already fixes three of the four watcher defects that cause-1 fix depended on (the un-restartable watch loop, the ignoredupdateInterval, the deadActivityManagerlookup) and starts sampling lazily on the carousel's first reveal. What #1812 deliberately does not do is stop sampling when the widget is hidden or the editor pauses, because the chart positions samples by index rather than by recorded time (ADFA-5660).So ADFA-5199 should stay open after this merges. Details and the numbers are in the ticket's latest comment.
Commits
Review by commit:
Reindent TemplateDetailsFragment to tabs- no behaviour change, Spotless ratchet only. Read it withgit show -w.Stop the template blink animator when its view stops- ties the blink toviewLifecycleOwner, 34 lines.Blink only while the scroll indicator is on screen- adds the screen-current and indicator-visible conditions asshouldBlinkScrollIndicator, plus its predicate test.Pin the blink teardown with a fragment lifecycle test- Robolectric test standing the fragment up (review follow-up).Correct the blink teardown comment, drop VisibleForTesting- comments and an annotation only (review follow-up).Pin the blink's return with the stop case- the stop case now restarts the view and asserts the blink comes back (review follow-up).Match the blink guard and fallback teardown to their intent-isViewStarted = falsein theonDestroyViewfallback, andisStartedrather than non-null in the start guard (review follow-up).Verification
:app:testV7DebugUnitTest --tests "*ScrollIndicatorBlinkTest*" --tests "*TemplateDetailsBlinkLifecycleTest*"- BUILD SUCCESSFUL. This compilesapp/src/test, whichcompileV8DebugKotlindoes not.TemplateDetailsBlinkLifecycleTestcases were run against the pre-fix fragment (014aa5801) and fail there for the reason they are named for:expected: null but was: ObjectAnimator ... alpha: 1.0 0.2 1.0.updateBlinkState()dropped fromblinkWhileOnScreen.onStart(isViewStarted = truekept), onlyblink stops when the view lifecycle stops and returns when it startsfails,expected: true but was: nullatTemplateDetailsBlinkLifecycleTest.kt:94. The screen-change case stays green under that mutation.spotlessCheck- BUILD SUCCESSFUL.🤖 Generated with Claude Code