Flutter change the child icon color of FloatingActionButton

Flutter v17.4

This worked for me, if you just want to change to colour of icon.

floatingActionButton: FloatingActionButton(
    child: Icon(Icons.add,
      color: Colors.black, //The color which you want set.
    ),
    onPressed: () => {},
  ),

You can wrap in an IconTheme

child: new IconTheme(
    data: new IconThemeData(
        color: Colors.yellow), 
    child: new Icon(Icons.add),
),

or a Theme where iconTheme is set the way you want it

(not tested)

To change the color of child Icon, You have to set the color in the Icon() widget.

Here I am sharing the code snippet where I have set the red color.

floatingActionButton: FloatingActionButton(
        tooltip: 'Increment',
        child: new Icon(Icons.add, color: Colors.red,),
        backgroundColor: Colors.yellow,
      ),