CODEWITHSUNDEEP
flutterpaintisnull
newbie
newbie

Reputation: 489

Flutter how to test if ui.Image is empty or null correctly?

I define globally a variable as ui.Image _img1Global = null as ui.Image; then I wanted to check to determine if the value is null or not.

if (_img1Global != null as ui.Image) {
              canvasWrapper.save();
              canvasWrapper.drawImage(
                  _img1Global, Offset(x, y - 2), new Paint());
              canvasWrapper.restore();
            }

I want to check if it is not null then I want to operate the drawImage but I keep getting error as type 'Null' is not a subtype of type 'Image' in type cast at this if statement ? How to check if its filled with ui.Image and check its correct type?

I have even try this

_img1Global != null as ui.Image
                ? print("is null")
                : print("is not null");

still I am getting same error ?

Upvotes: 0

Views: 1033

Answers (1)

Ibrahim Ali
Ibrahim Ali

Reputation: 2503

null as ui.Image

It is throwing an error because the above code is telling that set null type as an Image type

To check the type of a variable use the runtimeType operator

if (_img1Global.runtimeType == Image) print('True')

Upvotes: 1

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