how to change appbar color in flutter code example

Example 1: change icon color flutter

Icon(
  Icons.widgets,
  color: Colors.blue.shade400,
)

Example 2: how to change appbar color in flutter

appBar: AppBar(
      title: const Text('Example'),
      backgroundColor: Colors.black,
    ),

Example 3: flutter status bar color

return AnnotatedRegion<SystemUiOverlayStyle>(
  value: const SystemUiOverlayStyle(
    // For Android.
    // Use [light] for white status bar and [dark] for black status bar.
    statusBarIconBrightness: Brightness.light,
    // For iOS.
    // Use [dark] for white status bar and [light] for black status bar.
    statusBarBrightness: Brightness.dark,
  ),
  child: Scaffold(...),
);