手势驱动的动画
使用拖动和滑动驱动运动。
手势驱动的动画 是 CoddyKit 上的免费 Jetpack Compose Academy 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Jetpack Compose Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Jetpack Compose Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Motion You Control by Touch
State-driven animations run on their own, but some motion should follow your finger. Gesture-driven animations let drags and swipes steer the movement. ✨
Track the Offset
Hold the current position in state. The most direct tool is the Animatable, which stores a value and can both jump and animate to it.
val offsetX = remember { Animatable(0f) }Read Drag Events
Use pointerInput with detectDragGestures to receive each drag delta as the user moves their finger across the element.
Modifier.pointerInput(Unit) { detectDragGestures { _, drag -> } }Follow the Finger
During a drag, call snapTo to move instantly to the new position. Snapping keeps the element glued to the finger with no lag.
scope.launch { offsetX.snapTo(offsetX.value + drag.x) }Apply the Offset
Feed the value into an offset modifier so the Composable physically moves. The view tracks every pixel of the drag in real time.
Modifier.offset { IntOffset(offsetX.value.roundToInt(), 0) }Animate on Release
When the finger lifts, switch from snap to animateTo so the element glides back home or to the nearest anchor smoothly.
scope.launch { offsetX.animateTo(0f) }Carry the Momentum
Capture fling velocity from onDragEnd and pass it to animateDecay. The element keeps coasting after release, just like real flicks. 🌀
offsetX.animateDecay(velocity, exponentialDecay())Swipe Between Anchors
For swipe-to-dismiss or sliders, snap to fixed stops. anchoredDraggable ties gestures to defined anchor points and settles between them.
Coroutines Drive It
Animatable updates are suspend functions, so launch them in a coroutine scope. Grab one with rememberCoroutineScope inside your Composable.
val scope = rememberCoroutineScope()Interruptible by Design
Because gestures and animations share the same Animatable, a new touch interrupts any running animation, handing control straight back to the user.
The Feel of Native Apps
Combining snap during drag with decay and spring on release is the secret to fluid, natural gestures that feel responsive and alive.
Quick Check
While the finger is dragging, which Animatable call keeps the element glued to the touch?
Recap: Touch Meets Motion
You combined pointerInput with Animatable: snapTo while dragging, then animateTo or animateDecay on release for fluid, gesture-driven motion. 🎉
常见问题解答
「手势驱动的动画」课时是免费的吗？
是的 — 「手势驱动的动画」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Jetpack Compose Academy 课程的其余内容，请升级到 CoddyKit PRO。 Jetpack Compose Academy 课程共包含 4 节课。
「手势驱动的动画」这节课中我会学到什么？
使用拖动和滑动驱动运动。 你通过在浏览器中直接运行的动手代码来练习 Jetpack Compose Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Jetpack Compose Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Jetpack Compose Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。
「手势驱动的动画」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Jetpack Compose Academy 课中编写并运行代码吗？
能。每节 Jetpack Compose Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。