how to make a gradient background in flutter code example

Example 1: color gradient in flutter

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

Example 2: flutter container background gradient

appBar: AppBar(

      title: Text('Flutter Demo'),
      flexibleSpace: Container(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.centerLeft,
            end: Alignment.centerRight,
            colors: <Color>[
              Colors.red,
              Colors.blue
            ],
          ),
        ),
      ),
    ),

Example 3: add gradient bg to container in flutter

body: Container(
  decoration: BoxDecoration(
    gradient: LinearGradient(
      colors: [Colors.green, Colors.blue])
  ),
  child: Center(
    child: Text('Gradients are cool!',
      style: TextStyle(
        fontSize: 35,
        color: Colors.white,
      ),
    ),
  ),
),

Example 4: 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))
    )

Example 5: gradient widget flutter

GradientCard(
    gradient: Gradients.tameer,
    shadowColor: Gradients.tameer.colors.last.withOpacity(0.25),
    elevation: 8,
);