如何使图像在颤动上居中

Question

您好，我正在尝试将我的图像放在应用程序的中心，但我不明白。 我究竟做错了什么？我该如何集中这些图像？

---

InkWell(
    child: new Padding(
      padding: EdgeInsets.only(top: 50),
      child: snapshot.data.Facebook != ""
          ? Row(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                Align(
                  alignment: Alignment.bottomCenter,
                  child: Image.asset(
                    "assets/images/facebook.png",
                    height: 30,
                  ),
                ),
              ],
            )
          : Row(
              children: <Widget>[],
            ),
    ),
    onTap: () async {
      if (await canLaunch(snapshot.data.Facebook)) {
        await launch(snapshot.data.Facebook);
      } else {
        throw 'erro ao tentar acessar o facebook do(a) $snapshot.data.Nome';
      }
    }),

我停在这了

Answer 1

用于mainAxisAlignment使他们的孩子适应center, spaceAround, spaceBetween等。

并mainAxisSize提供尺寸mainAxis。

 InkWell(  
    child: new Padding(  
     padding: EdgeInsets.only(top: 50),  
      child: snapshot.data.Facebook != ""          
      ?      
        Row(
          mainAxisAlignment : MainAxisAlignment.center,
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            Align(
              alignment: Alignment.bottomCenter,
              child: Image.asset(
                "assets/images/facebook.png",
                height: 30,
              ),
            ),
          ],
        )
      : Row(
          children: <Widget>[],
        ),
),
onTap: () async {
  if (await canLaunch(snapshot.data.Facebook)) {
    await launch(snapshot.data.Facebook);
  } else {
    throw 'erro ao tentar acessar o facebook do(a) $snapshot.data.Nome';
  }
}),