When the keyboard appears, the Flutter widgets resize. How to prevent this?

I have a Column of Expanded widgets like this:

 return new Container(
      child: new Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: <Widget>[
          new Expanded(
            flex: 1,
            child: convertFrom,
          ),
          new Expanded(
            flex: 1,
            child: convertTo,
          ),
          new Expanded(
            flex: 1,
            child: description,
          ),
        ],
      ),
    );

It looks like this:

convertFrom, includes a TextField. When I tap on this text field, the Android keyboard appears on the screen. This changes the screen size, so the widgets resize like this:

Is there a way to have the keyboard "overlay" the screen so that my Column doesn't resize? If I don't use Expanded widgets and hardcode a height for each widget, the widgets don't resize, but I get the black-and-yellow striped error when the keyboard appears (because there isn't enough space). This also isn't flexible for all screen sizes.

I'm not sure if this is an Android-specific or Flutter-specific.

Updated Answer

resizeToAvoidBottomPadding is now deprecated.

The updated solution is to set resizeToAvoidBottomInset property to false.

Original Answer

In your Scaffold, set resizeToAvoidBottomPadding property to false.

Most other answers suggest using resizeToAvoidBottomPadding=false. In my experience this allows the keyboard to cover up text fields if they are underneath where the keyboard would appear.

My current solution is to force my column to be the same height as the screen, then place it in a SingleChildScrollView so that Flutter automatically scrolls my screen up just enough when the keyboard is used.

Widget build(BuildContext context) {
  return Scaffold(
    body: SingleChildScrollView(
      physics: NeverScrollableScrollPhysics(),
      child: ConstrainedBox(
        constraints: BoxConstraints(
          minWidth: MediaQuery.of(context).size.width,
          minHeight: MediaQuery.of(context).size.height,
        ),
        child: IntrinsicHeight(
          child: Column(
            mainAxisSize: MainAxisSize.max,
            children: <Widget>[
              // CONTENT HERE
            ],
          ),
        ),
      ),
    ),
  );
}

I use NeverScrollableScrollPhysics so that the user cannot scroll around themselves.

Set resizeToAvoidBottomInset to false instead of resizeToAvoidBottomPadding which is deprecated.

    return Scaffold(
      resizeToAvoidBottomInset : false,
      body: YourWidgets(),
    );

My approach is to use SingleChildScrollView with the ClampingScrollPhysics physics.

SingleChildScrollView(
  physics: ClampingScrollPhysics(),
  child: Container(),
)