Placeholder=

"This is a hint"

In Flutter, you can easily show a “hint” or a placeholder text
for your input by adding an InputDecoration object
to the decoration constructor parameter for the text widget.

How do I show validation errors?

With Xamarin.Forms, if you wished to provide a visual hint of a
validation error, you would need to create new properties and
VisualElements surrounding the Elements that had validation errors.

In Flutter, you pass through an InputDecoration object to the
decoration constructor for the text widget.

However, you don’t want to start off by showing an error.
Instead, when the user has entered invalid data,
update the state, and pass a new InputDecoration object.

Flutter plugins

Interacting with hardware, third party services, and the platform

How do I interact with the platform, and with platform native code?