KHANH NGUYEN: Need to provide users

with a way to select a value from a list of options?

Try DropdownButton.

To start, give it a list of options as DropdownMenuItems.

DropdownMenuItems represent the things you'll actually

see in the dropdown menu.

Since they're all in a list together,

they must all be of the same type.

Provide a state variable containing

the value of the selected DropdownMenuItem.

And finally, give it an onChanged callback that calls

setState() to update the variable when a new value is

selected.

Now, technically, you can stop right there,

or you can customize the DropdownButton

to your heart's content.

Is that arrow too small?

Make it bigger by adjusting the icon, Size.

Or perhaps the default gray doesn't stand out enough.

Give it a splash of color by providing an iconEnabledColor.

Don't even like the arrow?

Go ahead and replace it with a different icon.

Have the dropdown content horizontally fill its parent

by enabling isExpanded.

And you can even give the text a fresh coat of paint

by providing a style.

One thing to remember-- if either onChanged

or the list of items are null, the DropdownButton

gets disabled.

The arrow will be grayed out and it won't respond to input.

For more info on Flutter and all the other widgets,

head to Flutter.dev.

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