How to to display text over the images in Flutter?

try this

Container(
         child: Center(child: Text('test'),),
         height: 190.0,
         width: MediaQuery.of(context).size.width - 100.0,
         decoration: BoxDecoration(
         borderRadius: BorderRadius.circular(5),
         color: Colors.blue,
         image: DecorationImage(
                image: new NetworkImage(
                "https://storage.googleapis.com/gd-wagtail-prod-assets/original_images/MDA2018_inline_03.jpg"
                  ),
          fit: BoxFit.fill
              )
                 ),
              ),

Just want to add a small example of Stack Widget

return Scaffold(
  appBar: AppBar(
    title: Text("Text Over Image"),
  ),
  body: Center(
    child: Stack(
      children: <Widget>[
        Container(
          alignment: Alignment.center,
          child: Image.network(
            'https://cdn.pixabay.com/photo/2018/07/11/21/51/toast-3532016_1280.jpg',
            height: 250,
            width: double.infinity,
            fit: BoxFit.cover,
          ),
        ),
        Container(
            alignment: Alignment.center,
            child: Text(
              'Text Message',
              style: TextStyle(color: Colors.white,
                  fontWeight: FontWeight.bold,
                  fontSize: 22.0),
            )),
      ],
    ),
  ),
);

Output:

You can read more in my article on medium.com

You can use a Stack widget for that:

Stack(
    children: <Widget>[
        yourImageWidget,
        Center(child: Text("someText")),
    ]
)

PhotosList class:

PhotosList({Key key, this.photos}) : super(key: key);

@override
Widget build(BuildContext context) {
    return _buildBody();
}

Widget _buildBody() {
    return new ListView.builder(
            itemCount: photos.length,
            itemBuilder: (context,int){
            return Stack(
                children: <Widget> [
                    new CachedNetworkImage(imageUrl: photos[int].url),
                    Center(child: Text(photos[int].title)),
                ]
            );
            }
        );
    }
}

I find this worked a bit better and you don't need the Center widget:

Stack(
    alignment: Alignment.center,
    children: <Widget>[
        yourImageWidget,
        Text("someText"),
    ]
)