基于compose_version=1.1.0-beta01版本 参数如下：
DropdownMenu(expanded: Boolean,//菜单栏状态onDismissRequest: () -> Unit,//菜单栏被关闭回调modifier: Modifier = Modifier,//布局修饰offset: DpOffset = DpOffset(0.dp, 0.dp),//要添加到菜单位置的偏移量 properties: PopupProperties = PopupProperties(focusable = true),//自定义的弹出框content: @Composable ColumnScope.() -> Unit//内容)
简单使用：
@Composablefun DropDownTest() {val context = LocalContext.currentvar expanded = remember {mutableStateOf(false)}val items = listOf("A", "B", "C", "D", "E")Box(Modifier.fillMaxSize().padding(10.dp).wrapContentSize(Alignment.TopStart)) {TextButton(onClick = {expanded.value = true},modifier = Modifier.background(Color.LightGray)) {Text(text = "下拉菜单")}DropdownMenu(expanded = expanded.value, onDismissRequest = { expanded.value = false }) {items.forEachIndexed { index, s ->DropdownMenuItem(onClick = {expanded.value = falseToast.makeText(context, s, Toast.LENGTH_SHORT).show()}) {Text(text = s)}}}}}
效果如图：
