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Frameworks & web · #jetpackcompose
Learn how to implement state hoisting in Jetpack Compose to decouple UI from logic, improve testability, and create reusable stateless components.
Learn how to pair key-based item identity with rememberSaveable in Jetpack Compose’s LazyColumn to keep scroll position, preserve checkbox state across rotations, and cut unnecessary recompositions. Includes a working example, limits, and common pitfalls.
Use derivedStateOf to memoize filtered lists and UI flags in Jetpack Compose so recomposition only happens when the projected result actually changes, not on every source update.
Learn how to use Jetpack Compose's rememberSaveable to keep UI state like text field content or custom data objects alive across screen rotations and process death, with a worked example and verification steps.
Learn how to hoist UI state out of Jetpack Compose composables to make them pure, reusable, and easy to test, with a concrete counter‑button example and verification steps.
LazyColumn or a scrollable Column? A decision guide covering composition cost, keys, the infinite-constraints crash, and a quick way to validate the difference yourself.
Learn how hoisting state with remember and mutableStateOf keeps composables stateless, limits recomposition scope, and improves UI performance.
In Jetpack Compose, a remember block can trigger recomposition even when the values it captures have not changed, because the block’s invalidation logic does not correlate directly with observable parameter updates. As documented for Compose 1.6, this behavior persists, meaning UI trees may be rebuilt without explicit parameter changes, potentially impacting
Goal: Determine whether Jetpack Compose should automatically supply a MaterialTheme when Material components are used without an explicit provider, so teams can decide if relying on implicit theming is safe for production code. Uncertainty: The current implementation throws java.lang.IllegalStateException: No MaterialLocal found in Compose BOM 2023.10.00 and
kotlin