Hi@akhtar,
You can use Icon Widget to create an Icon in your app. This Icon Widget provides lots of symbols like volume_up, email, etc. I have attached one example below that will create a volume_up Icon.
var MyVolIcon = Icon(
Icons.volume_down,
color: Colors.grey.shade900,
);
var MyVolUp = IconButton(icon: MyVolIcon, onPressed: null);
var myappBar = AppBar(
title: mytext,
backgroundColor: Colors.amber,
actions: <Widget>[
MyEmailButton,
MyVolUp,
],
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