The return of string value is null or empty when I call the function using GetX in flutter

Question

I want to call the string function, I use package_info_plus to get the packageName when I run the app, just like this:

class SplashScreenController extends GetxController {
  late String one = '';
  late RxString two = ''.obs;

  @override
  void onInit() {
    _initPackageInfo();
    _setImage();
    Timer(Duration(seconds: 5), () => Get.offNamed(Routes.DASHBOARD));
    super.onInit();
  }

  @override
  void onClose() {}

  Future<void> _initPackageInfo() async {
    final info = await PackageInfo.fromPlatform();
    one = info.packageName;
  }

  String _setImage() {
    if (one == 'com.package.one') {
      return two.value = Images.one;
    } else if (one == 'com.package.two) {
      return two.value = Images.two;
    } else {
      return two.value = Images.one;
    }
  }
}

And when I try to call RxString two inside Image.asset()

@override
  Widget build(BuildContext context) {
    print(controller.two);
    return Obx(() => Scaffold(
            body: Container(
          color: const Color.fromARGB(255, 255, 255, 255),
          alignment: AlignmentDirectional.center,
          child: controller.one.isNotEmpty
              ? Image.asset(controller.two.toString())
              : const SizedBox.shrink(),
        )));
  }

It show the null value, is there any way for me to use the packageName value in conditional case and then calling it in Image.asset() widget?

Answer 1

I have rewrite your controller and UI Code. Please check it out.

Controller (SplashScreen)

class SplashScreenController extends GetxController {
  late RxString one = ''.obs;
  late RxString two = ''.obs;

  @override
  void onInit() async {
    await _initPackageInfo();
    Timer(Duration(seconds: 5), () => Get.offNamed(Routes.DASHBOARD));
    super.onInit();
  }

  @override
  void onClose() {}

  Future<void> _initPackageSetImage() async {
    final info = await PackageInfo.fromPlatform();
    one.value = info.packageName;
    switch(one.value){
      case 'com.package.one':
        two.value = Images.one;
        break;
      case 'com.package.two':
        two.value = Images.two;
        break;
      default:
        two.value = Images.one;
        break;
    }
  }
}

UI (SplashScreen)

@override
  Widget build(BuildContext context) {
    
    return Scaffold(
            body: Container(
          color: const Color.fromARGB(255, 255, 255, 255),
          alignment: AlignmentDirectional.center,
          child: Obx((){
             print(controller.two.value);
             if(controller.one.value.isNotEmpty){
               return Image.asset(controller.two.value);
             }
             return const SizedBox.shrink();
           }),
        ));
  }