How to center column and row item in Flutter?

use like this

• In Colum

  child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [...
                         .
                         ] 
  

• In Row

   child: Row(
      mainAxisAlignment: MainAxisAlignment.center,
      crossAxisAlignment: CrossAxisAlignment.center,
      children: [...
                         .
                         ] 
  

If you want the whole table to be Centered, use the mainAxisAlignment property of Column.

Column

mainAxisAlignment: MainAxisAlignment.center //Center Column contents vertically,
crossAxisAlignment: CrossAxisAlignment.center //Center Column contents horizontally,

Row

mainAxisAlignment: MainAxisAlignment.center //Center Row contents horizontally,
crossAxisAlignment: CrossAxisAlignment.center //Center Row contents vertically,

You can use Spacer if you want fine grain control.

Column(
  children: <Widget>[
    Spacer(), // 1st spacer
    Widget1(),
    Widget2(),
    Spacer(), // 2nd spacer
  ],
)

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You can change flex too using Spacer(flex:2)

If you want it to be like in the picture, use

mainAxisAlignment: MainAxisAlignment.spaceEvenly