I want to create bottom sheet dialog like this image below in flutter

Try below code,

showModalBottomSheet(
      context: context,
      builder: (BuildContext cntx) {
        return Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            ListTile(
              leading: Icon(Icons.camera),
              title: Text("Camera"),
              onTap: () async {
          
              },
            ),
            ListTile(
              leading: Icon(Icons.image),
              title:  Text("Files")),
              onTap: () async {
              },
            ),
            Container(
              height: 50,
              color: prefix0.appBackgroundColcor,
              child: ListTile(
                title: Center(
                  child: Text(
                    "Cancel",
                    style: TextStyle(color: Colors.white),
                  ),
                ),
                onTap: () {
                  Navigator.pop(context);
                },
              ),
            )
          ],
        );
      });

You can use cupertino bottom modal to achieve something like that. See below code for implementation:

void show() {
    showCupertinoModalPopup(
        context: context,
        builder: (BuildContext cont) {
          return CupertinoActionSheet(
            actions: [
              CupertinoActionSheetAction(
                onPressed: () {
                  print('Camera');
                },
                child: Text('Use Camera'),
              ),
              CupertinoActionSheetAction(
                onPressed: () {
                  print('Upload files');
                },
                child: Text('Upload from files'),
              ),
              CupertinoActionSheetAction(
                onPressed: () {
                  print('Dropbox');
                },
                child: Text('Upload from DropBox'),
              )
            ],
            cancelButton: CupertinoActionSheetAction(
              onPressed: () {
                Navigator.of(cont).pop;
              },
              child: Text('Cancel', style: TextStyle(color: Colors.red)),
            ),
          );
        });
  }

Call the show function with the press of any button. You will see something like this.

If you don't want the divider between actions you have to create your own custom popup.