title: Image not inside circle avatar
body: <p>i'm trying to pick image from my gallery then show it to my circleavater, the problem is, the image isn't inside the circle avatar. </p>
  
  <p>So, i'm using <code>image_picker: ^0.4.12+1</code></p>
  
  <pre><code>  Future getImage() async {
      var image = await ImagePicker.pickImage(source: ImageSource.gallery);
      setState(() {
        _image = image;
      });
    }
  </code></pre>
  
  <p>and here is the widget</p>
  
  <pre><code>  children: &lt;Widget&gt;[
                  _image == null ?
                   Container(
                      width: 150.0,
                      height: 150.0,
                      margin: EdgeInsets.only(top: 25.0, bottom: 10.0),
                       child: CircleAvatar(
                         radius: 30.0,
                         backgroundImage:
                         NetworkImage('https://via.placeholder.com/150'),
                         backgroundColor: Colors.transparent,
                       )
                  ): Container(
                    height: 150.0,
                    width: 150.0,
                      margin: EdgeInsets.only(top: 25.0, bottom: 10.0),
                      child: CircleAvatar(
                        radius: 30.0,
                        backgroundImage:
                        NetworkImage('https://via.placeholder.com/150'),
                        backgroundColor: Colors.transparent,
                        child:  new Image.file(_image),
                      )
  
                  )
  //etc
  </code></pre>
  
  <p>here is the screenshot when the page open</p>
  
  <p><a href="https://i.stack.imgur.com/F6zSD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/F6zSD.png" alt="enter image description here"></a></p>
  
  <p>and here is the screenshot after i pick an image</p>
  
  <p><a href="https://i.stack.imgur.com/qtGlj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qtGlj.png" alt="enter image description here"></a></p>
  
  <p>how can i fix it, sorry for my english and thanks in advance</p>