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根目录新建

调用

leading: CircleAvatar(              child: Image.asset("images/ic_launcher.png"),            )

pubspec.yaml 

要配置下

flutter:  # The following line ensures that the Material Icons font is  # included with your application, so that you can use the icons in  # the material Icons class.  uses-material-design: true  # To add assets to your application, add an assets section, like this:  assets:     - images/ic_launcher.png

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