how to use gradient as color in flutter code example

Example 1: color gradient in flutter

decoration: BoxDecoration(
    gradient: LinearGradient(
      colors: [Colors.green, Colors.blue])
  ),

Example 2: custom gradient flutter

BoxDecoration(
      gradient: LinearGradient(
        colors: [
          AppColors.roseGradientColor,
          AppColors.purpleInAppGradientColor,
          AppColors.blueInAppGradientColor
        ],
        begin: Alignment(-0.7,12),
        end: Alignment(1,-2),
      ),
        borderRadius: BorderRadius.only(bottomLeft: Radius.circular(25),bottomRight: Radius.circular(25))
    )