浮动按钮，FAB按钮

浮动按钮，FAB按钮

@Composable
fun FabButton (){
    Scaffold(
        modifier = Modifier
            .fillMaxSize(),
        floatingActionButton  = {
            ExtendedFloatingActionButton(
                text = { Text("Add Button") },
                icon = { Icon(Icons.Filled.Add,"")},
                onClick = { },
                modifier = Modifier.fillMaxWidth(0.4f)
                    .fillMaxHeight(0.075f),
                shape = AbsoluteRoundedCornerShape(50),
                backgroundColor = MaterialTheme.colors.primary,
                contentColor = MaterialTheme.colors.onPrimary
                )
        },
        floatingActionButtonPosition = FabPosition.Center,
        isFloatingActionButtonDocked = false,
        content = {}
    )
}