How to display image file in firestore with Flutter

You need to add the url to firestore first:

          StorageTaskSnapshot snapshot = await storage
              .ref()
              .child("images/$imageName")
              .putFile(file)
              .onComplete;
          if (snapshot.error == null) {
            final String downloadUrl =
                await snapshot.ref.getDownloadURL();
            await Firestore.instance
                .collection("images")
                .add({"url": downloadUrl, "name": imageName});
             }

Now in Firestore you will have collection called images and document with the image url and image name. The method getDownloadUrl() returns the url of the image so you can store it in Firestore. Then to display it you can do the following:

body: Container(
  padding: EdgeInsets.all(10.0),
  child: FutureBuilder(
    future: getImages(),
    builder: (context, AsyncSnapshot<QuerySnapshot> snapshot) {
      if (snapshot.connectionState == ConnectionState.done) {
        return ListView.builder(
            shrinkWrap: true,
            itemCount: snapshot.data.documents.length,
            itemBuilder: (BuildContext context, int index) {
              return ListTile(
                contentPadding: EdgeInsets.all(8.0),
                title:
                    Text(snapshot.data.documents[index].data["name"]),
                leading: Image.network(
                    snapshot.data.documents[index].data["url"],
                    fit: BoxFit.fill),
              );
            });
      } else if (snapshot.connectionState == ConnectionState.none) {
        return Text("No data");
      }
      return CircularProgressIndicator();
    },
  ),
),

/// code here

  Future<QuerySnapshot> getImages() {
    return fb.collection("images").getDocuments();
  }

Here you use the method getImages() which retrieves all the images from the collection images. To display the image you can use Image.network widget.