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Refine top-level navigation motion #268

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@MihaiCristianCondrea
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@MihaiCristianCondrea MihaiCristianCondrea commented Sep 21, 2025

Summary

  • update MainActivity to apply fade-through motion for top-level navigation and respect system animation settings
  • add Material-style fade-through animation resources and remove the unused spring-based animations

Testing

  • ./gradlew test (fails: Android SDK not installed in container)

https://chatgpt.com/codex/tasks/task_e_68cefb8d6ce0832d8febf638f866a40a

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Codex Review: Here are some suggestions.

Reply with @codex fix comments to fix any unresolved comments.

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Comment on lines +306 to +313
private NavOptions.Builder applyTopLevelNavAnimations(NavOptions.Builder builder) {
if (ValueAnimator.areAnimatorsEnabled()) {
builder.setEnterAnim(R.anim.fragment_top_level_enter)
.setExitAnim(R.anim.fragment_top_level_exit)
.setPopEnterAnim(R.anim.fragment_top_level_enter)
.setPopExitAnim(R.anim.fragment_top_level_exit);
} else {
builder.setEnterAnim(0)
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[P0] Guard ValueAnimator.areAnimatorsEnabled for pre-O devices

applyTopLevelNavAnimations now calls ValueAnimator.areAnimatorsEnabled() unconditionally. That API was added in Android O, but the app’s minSdk is 23, so any device running API 23–25 will crash with NoSuchMethodError as soon as this helper executes (e.g., on app start when navigation is set up). Please gate the call behind a Build.VERSION.SDK_INT >= Build.VERSION_CODES.O check or fall back to querying Settings.Global.ANIMATOR_DURATION_SCALE.

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Comment on lines +1 to +14
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<scale
android:duration="300"
android:startOffset="90"
android:fromXScale="0.92"
android:fromYScale="0.92"
android:toXScale="1"
android:toYScale="1"
android:pivotX="50%"
android:pivotY="50%"
android:interpolator="@android:interpolator/fast_out_extra_slow_in" />
<alpha
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[P1] Avoid using platform interpolator absent on minSdk

The new fade-through resources reference @android:interpolator/fast_out_extra_slow_in, which was introduced well after API 23. When this animation is inflated on older devices the resource ID is missing and Resources.NotFoundException will be thrown, breaking every top-level navigation transition on those devices. Consider providing a compat interpolator (e.g., via androidx.interpolator or a custom resource packaged in the app) or guard usage by API level.

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