How to set conditional statement for image in Flutter?

Question

I have conditional statement to set image from Flutter assets, but is not working in Scaffold body.

How to set conditional statement for image in Flutter?

String _backgroundImage;

void _setImage() {
  String _mTitle = "${widget.title.data}";

  if(_mTitle == “Goodmorrning”) {
    _backgroundImage = "assets/mobil_hello/goodmorrning.jpg";
  } else if(_mTitle == “Good day”) {
    _backgroundImage = "assets/mobil_hello/goodday.jpg";
  } 

  print("_mTitle: $_mTitle");  // works
  print("_backgroundImage: $_backgroundImage"); // works
}


Widget build(BuildContext contest) {

  return Scaffold(
    body: new Container(
        decoration: BoxDecoration(
            color: widget.backgroundColor,
                image: new DecorationImage(
                        fit: BoxFit.cover,
                        image: new AssetImage("$_backgroundImage") // not working
                        ),
        ),
    ),
  );
}

Answer 1

You could do something like this:

String _setImage() {
  String _mTitle = "${widget.title.data}";

  if(_mTitle == “Goodmorrning”) {
    return "assets/mobil_hello/goodmorrning.jpg";
  } else if(_mTitle == “Good day”) {
    return "assets/mobil_hello/goodday.jpg";
  } 

  print("_mTitle: $_mTitle");  // works
  print("_backgroundImage: $_backgroundImage"); // works
}


Widget build(BuildContext contest) {

  return Scaffold(
    body: new Container(
        decoration: BoxDecoration(
            color: widget.backgroundColor,
                image: new DecorationImage(
                        fit: BoxFit.cover,
                        image: new AssetImage(_setImage()) // not working
                        ),
        ),
    ),
  );
}