title: show images with grid view in flutter
body: <p>I tried to use StaggeredGridView but it wont load anything on my page, not even just text. I haven't put images URLs yet cuz I want to test it out.</p>
  <p>So far this is my code below:</p>
  <pre><code> body: ListView(
            children: [
              Container(
                width: deviceSize.width,
                height: 650,
                child: Stack(
                  alignment: AlignmentDirectional.center,
                  children: [
                    Image.asset(
                      'assets/Big Sur.jpg',
                      width: deviceSize.width,
                      fit: BoxFit.cover,
                    ),
                    Stack(
                      children: [
                        Text(
                          &quot;&quot;&quot;\n\n\nA decentralized photography platform\nfor the devoted communities.&quot;&quot;&quot;,
                          style: TextStyle(
                            color: Colors.white,
                            fontSize: 30,
                          ),
                        ),
                        Text(
                          'PhoBlock',
                          style: TextStyle(
                            fontWeight: FontWeight.bold,
                            color: Colors.white,
                            fontSize: 80,
                          ),
                        )
                      ],
                    ),
                  ],
                ),
              ),
              SizedBox(
                height: 50,
              ),
              StaggeredGridView.countBuilder(
                crossAxisCount: 4,
                itemBuilder: (BuildContext context, int index) {
                  return Container(
                    color: Colors.green,
                    child: new Center(
                      child: new CircleAvatar(
                        backgroundColor: Colors.white,
                        child: new Text('$index'),
                      ),
                    ),
                  );
                },
                staggeredTileBuilder: (int index) {
                  return StaggeredTile.count(2, index.isEven ? 2 : 1);
                },
                mainAxisSpacing: 4.0,
                crossAxisSpacing: 4.0,
              ),
  </code></pre>
  <p>This was from the body of the Scaffold widget. Please help me as I'm trying to figure out how to use this new StaggeredGridView widget...</p>