Apply motion design principles for mobile apps covering timing curves, transitions, gestures, and performance-conscious animations. Use when implementing screen transitions, gesture-driven interactions, shared-element animations, or optimizing animation frame rates on iOS, Android, or Flutter.
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| Duration | Range | Use Case |
|---|---|---|
| Short | 100-150ms | Toggles, cell press |
| Medium | 250-350ms | Navigation, modals |
| Long | 400-600ms | Shared element, complex state |
Hard limit: Never exceed 600ms for any animation.
400-600ms shared-element or complex-state pattern; do not substitute the Medium range.Curves.fastOutSlowIn (Material) or easeInOut (iOS). Never use linear.transform, opacity). Avoid width/height which trigger layout.onPan / interactivePopGesture for fluid, interruptible UX.See implementation examples for Flutter and iOS animation patterns.
dispose() AnimationControllers in Flutter; invalidate timers in iOS.When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
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概要と使いどころ
Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.
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Apply Clean Architecture layering, modularization, and Unidirectional Data Flow in Android projects. Use when setting up project structure, placing code in layers, configuring feature/core modules, or implementing UDF patterns; defer Compose state and ViewModel/StateFlow implementation to their specific skills.
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Implement WorkManager and background processing correctly on Android. Use when creating Worker classes, scheduling tasks, choosing between WorkManager and Foreground Services, or setting up Hilt in workers; defer FCM and notification delivery to android-notifications.
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Build high-performance declarative UI with Jetpack Compose. Use when writing Composable functions, optimizing recomposition, hoisting state, or working with LazyColumn and side effects; defer deep-link and navigation routing to android-navigation.
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Migrate an Android XML View to Jetpack Compose following a structured 10-step workflow. Use when converting XML layouts to Compose, setting up Compose in an existing View-based project, or incrementally adopting Compose.
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Write correct coroutine scopes, lifecycle collection, and dispatcher injection in Android production code. Use for suspend functions, coroutine scopes, and dispatcher mechanics; defer ViewModel StateFlow/LiveData architecture, Fragment lifecycle recipes, persistence/notifications, and unit-test recipes to their specific skills.
日本語の概要は準備中です。原文の説明を表示しています。