Flutter DataTable remove extra padding

Question

I want to display some data in a DataTable, i have 9 columns, all of them are number except the first one.

The problem i'm having is, i only see the first 5 columns, not because data are too long, but because there are a lot of space between every column.

Is there a way to make the DataColumn wrap the data with a padding i choose? This is my code:

Scaffold(
  appBar: AppBar(
    title: Text('DataTable Sample'),
  ),
  body: Container(
    child: DataTable(columns: <DataColumn>[
          DataColumn(
            label: Text('Name'),
          ),
          DataColumn(
            label: Text('A'),
          ),
          DataColumn(
            label: Text('B'),
          ),
          DataColumn(
            label: Text('C'),
          ),
          DataColumn(
            label: Text('D'),
          ),
          DataColumn(
            label: Text('E'),
          ),
          DataColumn(
            label: Text('F'),
          ),
          DataColumn(
            label: Text('G'),
          ),
          DataColumn(
            label: Text('H'),
          ),
        ], rows: <DataRow>[
          DataRow(cells: [
            DataCell(Text('1 Boston')),
            DataCell(Text('3')),
            DataCell(Text('3')),
            DataCell(Text('7')),
            DataCell(Text('1')),
            DataCell(Text('30')),
            DataCell(Text('8')),
            DataCell(Text('+2')),
            DataCell(Text('-22')),
          ]),
          DataRow(cells: [
            DataCell(Text('2 London')),
            DataCell(Text('3')),
            DataCell(Text('4')),
            DataCell(Text('12')),
            DataCell(Text('44')),
            DataCell(Text('7')),
            DataCell(Text('44')),
            DataCell(Text('-98')),
            DataCell(Text('0')),
          ]),
          DataRow(cells: [
            DataCell(Text('3 Rome')),
            DataCell(Text('10')),
            DataCell(Text('50')),
            DataCell(Text('90')),
            DataCell(Text('4')),
            DataCell(Text('7')),
            DataCell(Text('33')),
            DataCell(Text('+5')),
            DataCell(Text('-61')),
          ]),
        ]
        )
  ),
);

Answer 1

Yes. Lately flutter team merged an update to this Widget. It is now only in the "master" channel (You are probably on "stable"), to switch run flutter channel master and then flutter upgrade in the terminal. After doing so you can control the space between each column by setting the columnSpacing parameter of DataTable. For further information check out this closed issue

Answer 2

you can use SingleChildScrollView and FittedBox as its child.

Scaffold(
  appBar: AppBar(
    title: Text('DataTable Sample'),
  ),
  body: SingleChildScrollView(
    scrollDirection: Axis.vertical,
    child: FittedBox(
      child: DataTable(
        columns: <DataColumn>[
          DataColumn(
            label: Text('Name'),
          ),
          DataColumn(
            label: Text('A'),
          ),
          DataColumn(
            label: Text('B'),
          ),
          DataColumn(
            label: Text('C'),
          ),
          DataColumn(
            label: Text('D'),
          ),
          DataColumn(
            label: Text('E'),
          ),
          DataColumn(
            label: Text('F'),
          ),
          DataColumn(
            label: Text('G'),
          ),
          DataColumn(
            label: Text('H'),
          ),
        ],
        rows: <DataRow>[
          DataRow(cells: [
            DataCell(Text('1 Boston')),
            DataCell(Text('3')),
            DataCell(Text('3')),
            DataCell(Text('7')),
            DataCell(Text('1')),
            DataCell(Text('30')),
            DataCell(Text('8')),
            DataCell(Text('+2')),
            DataCell(Text('-22')),
          ]),
          DataRow(cells: [
            DataCell(Text('2 London')),
            DataCell(Text('3')),
            DataCell(Text('4')),
            DataCell(Text('12')),
            DataCell(Text('44')),
            DataCell(Text('7')),
            DataCell(Text('44')),
            DataCell(Text('-98')),
            DataCell(Text('0')),
          ]),
          DataRow(cells: [
            DataCell(Text('3 Rome')),
            DataCell(Text('10')),
            DataCell(Text('50')),
            DataCell(Text('90')),
            DataCell(Text('4')),
            DataCell(Text('7')),
            DataCell(Text('33')),
            DataCell(Text('+5')),
            DataCell(Text('-61')),
          ]),
        ],
      ),
    ),
  ),
);

Answer 3

Try that:

...
DataTable(
   horizontalMargin: 0,
   columnSpacing: 10,
   columns: [
...