flutter color transparent code example

Example 1: flutter how to add opacity to color

backgroundColor: Colors.black.withOpacity(0.5)

Example 2: opacity color flutter

Color(0xFF0E3311).withOpacity(0.5)

Example 3: how to set opacity of background color in flutter

Opacity(
          opacity: 0.5,
          child: Container(
          color: Colors.red,
          width: 200,
          height: 200,
  ),
        ),