安卓软件开发:Jetpack Compose中常见的核心概念总结-8

原创

Nimyears

发布于 2024-11-08 10:12:26

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文章被收录于专栏：JetpackCompose M3JetpackCompose M3 玩转全栈

37. Swipe组件和滑动效果

SwipeToDismiss - 滑动删除

SwipeToDismiss(
    state = rememberDismissState(),
    background = { /* Background Content */ },
    dismissContent = { /* Content to Dismiss */ }
)

SwipeToDismiss: 实现滑动删除效果的组件。

SwipeRefresh - 刷新效果

val refreshState = rememberSwipeRefreshState(isRefreshing = false)

SwipeRefresh(
    state = refreshState,
    onRefresh = { /* Refresh logic */ }
) {
    Text("Swipe to Refresh")
}

SwipeRefresh: 实现下拉刷新的效果。

38. 屏幕适配和响应式布局

Modifier.fillMaxSize - 填充屏幕

Box(
    modifier = Modifier.fillMaxSize()
) {
    Text("This fills the entire screen")
}

BoxWithConstraints - 基于屏幕大小适配

BoxWithConstraints {
    if (maxWidth < 300.dp) {
        Text("Small screen")
    } else {
        Text("Large screen")
    }
}

BoxWithConstraints: 根据屏幕尺寸动态适配内容。

39. 弹性滑动和滚动效果

scrollable Modifier - 使内容可滚动

Box(
    modifier = Modifier
        .size(300.dp)
        .scrollable(
            state = rememberScrollableState { delta ->
                // Handle scroll delta
                delta
            },
            orientation = Orientation.Vertical
        )
) {
    Text("Scrollable content")
}

scrollable: 使组件可以响应滚动手势，可以指定滚动方向。

ScrollState - 管理滚动状态

val scrollState = rememberScrollState()

Column(
    modifier = Modifier.verticalScroll(scrollState)
) {
    repeat(20) {
        Text("Item #$it")
    }
}

verticalScroll: 实现垂直方向上的滚动。

40. 瀑布流布局

LazyVerticalGrid - 网格布局

LazyVerticalGrid(
    cells = GridCells.Adaptive(128.dp),
    contentPadding = PaddingValues(16.dp)
) {
    items(20) { index ->
        Card(
            modifier = Modifier.padding(4.dp),
            elevation = 4.dp
        ) {
            Text("Item $index", Modifier.padding(16.dp))
        }
    }
}