Jetpack 撰写带圆角的下拉菜单

Question

您好，我不知道如何在 jetpack compose 中制作切角菜单1.0.0-beta02。我尝试用表面包裹 while 菜单，但没有用。

    TopAppBar(
        modifier = Modifier
            .statusBarsPadding(),
        title = {
            Text(text = "Title")
        },
        actions = {
            var menuExpanded by remember { mutableStateOf(false) }

            IconButton(onClick = { menuExpanded = true }) {
                Icon(Icons.Default.MoreVert, contentDescription = null)
            }

            DropdownMenu(
                expanded = menuExpanded,
                onDismissRequest = {
                    menuExpanded = false
                },
            ) {
                DropdownMenuItem(onClick = {}) {
                    Text("Item 2")
                }
            }
        },
    )

这给了我

但我需要这样的东西，它是四舍五入的。

Answer 1

使用1.0.x的默认形状由使用中的属性DropdownMenu定义 （检查您的主题）。mediumshapesMaterialTheme

val Shapes = Shapes(
    small = RoundedCornerShape(4.dp),
    medium = RoundedCornerShape(4.dp),  //<- used by `DropdownMenu`
    large = RoundedCornerShape(0.dp)
)

您可以在主题中更改此值，也可以仅在DropdownMenu.
就像是：

    MaterialTheme(shapes = MaterialTheme.shapes.copy(medium = RoundedCornerShape(16.dp))) {
        DropdownMenu(
            expanded = menuExpanded,
            onDismissRequest = {
                menuExpanded = false
            }                
        ) {
            DropdownMenuItem(onClick = {}) {
                Text("Item 2")
            }
            DropdownMenuItem(onClick = {}) {
                Text("Item 3")
            }
        }
    }