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Add Predictive Back gesture demo (PredictiveBackHandler)#220

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dipenpradhan wants to merge 17 commits into
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dipenpradhan:issue-200-predictive-back
Open

Add Predictive Back gesture demo (PredictiveBackHandler)#220
dipenpradhan wants to merge 17 commits into
Gurupreet:masterfrom
dipenpradhan:issue-200-predictive-back

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@dipenpradhan dipenpradhan commented Jun 14, 2026

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Summary

Adds a Predictive Back gesture demo for Android 15+, as proposed in #200.

New "Predictive Back gesture" entry on the home screen launches PredictiveBackActivity, which uses Compose's PredictiveBackHandler:

  • An in-app navigation drawer follows the back-swipe progress in real time — it translates, scales and fades in lock-step with BackEventCompat.progress as the user drags
  • Commit (gesture completes) closes the drawer instead of finishing the activity
  • Cancel (gesture released early) springs the drawer back open (re-throws CancellationException, per the API contract)
  • The handler is enabled only while the drawer is open, so once closed the system handles back normally
  • android:enableOnBackInvokedCallback="true" added to the manifest <application> so the predictive animation is shown on Android 13+ devices

This mirrors the official compose-samples JetLagged drawer pattern referenced in the issue. Dark mode supported.

Closes #200

Verification

  • ./gradlew ktfmtCheck assembleDebug testDebugUnitTest passes locally (JDK 17, SDK 35)
  • CI ./gradlew build on this PR

Merge order

Stacks on #219 (dep refresh) and the rest of the upgrade chain. Its diff includes those commits until they merge.

🤖 Generated with Claude Code

cc @Gurupreet for review

dipen and others added 17 commits June 6, 2026 15:57
@claude
refactor: migrate Room annotation processing from KAPT to KSP
561f734 
- Replace kotlin-kapt with com.google.devtools.ksp in the app module
  and the common-kotlin convention plugin
- Add Room compiler via the ksp configuration instead of kapt
- Drop the kapt { correctErrorTypes = true } workaround
- Add symbol-processing-gradle-plugin (1.9.22-1.0.17) to buildSrc

Fixes Gurupreet#184

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: upgrade Kotlin to 2.1.20 with the K2 compiler
516a461 
- Bump kotlin-gradle-plugin 1.9.22 -> 2.1.20 (root + buildSrc)
- Adopt the new Compose Compiler Gradle plugin
  (org.jetbrains.kotlin.plugin.compose) in app and convention plugins
- Drop composeCompiler version constant and composeOptions blocks
- Replace removed -Xopt-in flag with -opt-in
- Bump KSP to 2.1.20-1.0.31 to match Kotlin

Fixes Gurupreet#182

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
style: bump ktfmt-gradle to 0.22.0 and reformat
0279224 
ktfmt-gradle 0.12.0 fails with 'Generic error during file processing'
once Kotlin 2.x is on the buildscript classpath. 0.22.0 supports
Kotlin 2.x and also formats *.kts build scripts, hence the repo-wide
reformat (no functional changes).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: bump compileSdk and targetSdk to 35 (Android 15)
d45b54d 
- AGP 8.2.2 -> 8.7.3 (compileSdk 35 supported from AGP 8.6)
- Gradle wrapper 8.5 -> 8.9 (required by AGP 8.7.x)

Fixes Gurupreet#185

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: adopt the Compose BOM (2024.12.01) for unified version management
0323bca 
- Replace compose/material3 version constants with composeBom
- Strip explicit versions from BOM-managed artifacts
- Import the BOM platform on every configuration that receives
  Compose artifacts (implementation, debugImplementation,
  androidTestImplementation, :data)
- Migrate API removals that come with Compose 1.7 / Material3 1.3:
  SmallTopAppBar -> TopAppBar, rememberRipple -> material3 ripple
- Update the outdated README Compose badge to the BOM version

Fixes Gurupreet#186

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: upgrade AndroidX Lifecycle to 2.8.7
b3e191b 
All lifecycle artifacts (viewmodel-compose, viewmodel-ktx,
livedata-ktx, runtime-ktx, viewmodel-savedstate) move together
via the shared androidLifecycleGrouped version.

Fixes Gurupreet#192

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: upgrade Navigation Compose to 2.8.9 with type-safe routes
afc9f0b 
- navCompose 2.7.7 -> 2.8.9; add kotlinx-serialization-json 1.8.0
- Apply the Kotlin serialization plugin in gmail and tiktok demos
- Gmail: string routes -> @serializable route objects
- TikTok: TikTokScreen becomes a serializable sealed interface;
  the profile route carries a typed userId argument read via
  toRoute(), bottom bar selection uses NavDestination.hasRoute

Fixes Gurupreet#193

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
refactor: migrate from ExoPlayer 2.x to AndroidX Media3 1.5.1
1ade1c9 
- Replace com.google.android.exoplayer:exoplayer with
  androidx.media3:media3-exoplayer and media3-ui
- Rewrite TikTokPlayer against the Media3 API (SimpleExoPlayer was
  removed; default media source factory handles asset URIs)
- Removes the last Jetifier warning produced by ExoPlayer 2.x

Fixes Gurupreet#183

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: upgrade Coil to 3.1.0
229d33d 
- Move to the io.coil-kt.coil3 artifact group
- Add coil-network-okhttp (network fetching is a separate artifact
  in Coil 3, self-registered via ServiceLoader)
- Migrate call sites: rememberImagePainter(data=) ->
  rememberAsyncImagePainter(model=), coil.* -> coil3.* imports

Fixes Gurupreet#191

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: implement Pull-to-Refresh demo with Material3 PullToRefreshBox
ffcbcb5 
PullRefreshList was a fully commented-out stub (TODO revisit pull
refresh). It now demonstrates the first-party PullToRefreshBox with
a simulated 1.5s reload that prepends an item to the list.

Fixes Gurupreet#187

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: complete Swipe-to-Dismiss demo with delete/archive actions and …
368f005 
…undo

The Swipeable Lists tab rendered SwipeToDismissBox items but swipes
never removed anything. Now:
- swipe left deletes (red background), swipe right archives
- items are actually removed from the keyed LazyColumn
- an Undo snackbar restores the item at its original position
- positionalThreshold set to half the item width

Fixes Gurupreet#188

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: add adaptive layout / large screen demo
0f14efd 
- NavigationSuiteScaffold switches bottom bar / rail / drawer by
  window size class
- ListDetailPaneScaffold gives single-pane on phones, two-pane on
  tablets and foldables, with predictive-back-aware pane navigation
- Favorites/Profile destinations display the live window size classes
- All adaptive artifacts are version-managed by the Compose BOM

Fixes Gurupreet#190

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: add infinite looping carousel with auto-advance
8be0dcc 
InfiniteCarousel builds on foundation's HorizontalPager with a large
virtual page count starting in the middle, so it loops endlessly in
both directions. Auto-advances every 3s and pauses while dragging.
Showcased at the top of the Carousel demo screen.

Fixes Gurupreet#13

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
test: add Compose UI tests to tags, carousel and login modules
927c9b1 
- Convention plugin now sets testInstrumentationRunner so any
  library module can host androidTests
- InterestTagTest: text, click action, onClick callback
- InfiniteCarouselTest: initial page, forward paging, backward loop
- LoginScreenTest: fields, button, text input

Refs Gurupreet#68

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
refactor: migrate dependency management to a Gradle version catalog
2eb1653 
- gradle/libs.versions.toml is the single source of truth for all
  versions, libraries and plugins; bundles mirror the old grouped
  dependency helpers
- All module build files use libs.* accessors
- Root build script uses the plugins DSL (ktfmt via alias); AGP,
  Kotlin, KSP and serialization reach the classpath via buildSrc,
  whose own dependencies are catalog-driven through a new
  buildSrc/settings.gradle.kts
- Delete Versions.kt, Dependencies.kt, GroupedDependencies.kt and
  DependencyHandlerExtensions.kt; keep convention plugins and
  ProjectConfigs.kt

Fixes Gurupreet#189

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
chore: refresh foundational dependencies to SDK-35-compatible baselines
d37b8c6 
activity-compose 1.10.1, core-ktx 1.16.0, appcompat 1.7.1,
material 1.12.0, room 2.7.1, paging 3.3.6, coroutines 1.10.2,
retrofit 2.11.0. Versions newer than these require compileSdk 36
and are deferred.

Fixes Gurupreet#199

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@claude
feat: add Predictive Back gesture demo for Android 15+
008db74 
PredictiveBackActivity uses Compose's PredictiveBackHandler to drive
an in-app drawer that follows the back-swipe progress (translate +
scale + fade), commits closed on completion and springs back on
cancel. Adds enableOnBackInvokedCallback to the manifest.

Fixes Gurupreet#200

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
@dipenpradhan dipenpradhan mentioned this pull request Jun 14, 2026
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Feature: Add Predictive Back gesture demo for Android 15+

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