Answers for "gridview flutter size"

GridView in flutter

GridView.builder(
              physics: NeverScrollableScrollPhysics(),
              shrinkWrap: true,
              gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                crossAxisCount: 5,
                crossAxisSpacing: 5.0,
                mainAxisSpacing: 5.0,
              ),
              itemCount: 10,
              itemBuilder: (context, index) {
                return Container(
                  color: Colors.blue,
                  child: Text("index: $index"),
                );
              },
            )

flutter gridview card height

class MyGridView extends StatefulWidget {
  @override
  _MyGridViewState createState() => _MyGridViewState();
}

class _MyGridViewState extends State<MyGridView> {

  // set an int with value -1 since no card has been selected  
  int selectedCard = -1;

  @override
  Widget build(BuildContext context) {
    return GridView.builder(
        shrinkWrap: false,
        scrollDirection: Axis.vertical,
        itemCount: 10,
        gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 2,
          childAspectRatio: MediaQuery.of(context).size.width /
              (MediaQuery.of(context).size.height / 3),
        ),
        itemBuilder: (BuildContext context, int index) {
          return GestureDetector(
            onTap: () {
              setState(() {
                // ontap of each card, set the defined int to the grid view index 
                selectedCard = index;
              });
            },
            child: Card(
              // check if the index is equal to the selected Card integer
              color: selectedCard == index ? Colors.blue : Colors.amber,
              child: Container(
                height: 200,
                width: 200,
                child: Center(
                  child: Text(
                    '$index',
                    style: TextStyle(
                      fontSize: 20,
                      color: Colors.white,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                ),
              ),
            ),
          );
        });
  }
}

grid view in flutter

CustomScrollView(
  primary: false,
  slivers: <Widget>[
    SliverPadding(
      padding: const EdgeInsets.all(20),
      sliver: SliverGrid.count(
        crossAxisSpacing: 10,
        mainAxisSpacing: 10,
        crossAxisCount: 2,
        children: <Widget>[
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text("He'd have you all unravel at the"),
            color: Colors.green[100],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Heed not the rabble'),
            color: Colors.green[200],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Sound of screams but the'),
            color: Colors.green[300],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Who scream'),
            color: Colors.green[400],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Revolution is coming...'),
            color: Colors.green[500],
          ),
          Container(
            padding: const EdgeInsets.all(8),
            child: const Text('Revolution, they...'),
            color: Colors.green[600],
          ),
        ],
      ),
    ),
  ],
)