Flutter: How to make a button expand to the size of its parent?

Question

I am trying to create square buttons, but Expanded doesn\'t seem to work the same as it does with containers. Take the following code for example

new Expanded(
          


        

Answer 1

Wrapping with a ButtonTheme with minWidth: double.infinity allows to provide constraints

ButtonTheme(
  minWidth: double.infinity,
  child: MaterialButton(
    onPressed: () {},
    child: Text('Raised Button'),
  ),
),

or after https://github.com/flutter/flutter/pull/19416 landed

  MaterialButton(
    onPressed: () {},
    child: SizedBox.expand(
      width: double.infinity, 
      child: Text('Raised Button'),
    ),
  ),