这有点棘手，但这是Flutter的工作方式，您
Container不知道
Parent的约束，于是它尝试填充所有可用空间。
您可以添加
Align小部件来修复它
_getCircleImage(String url) { return Align( alignment: Alignment.centerLeft, child: Container( width: 64.0, height: 64.0, decoration: new BoxDecoration( image: new DecorationImage( image: new NetworkImage(url), fit: BoxFit.cover, ), shape: BoxShape.circle, ), ), ); }More info : https://docs.flutter.io/flutter/widgets/Container-class.html
