Exception MUST_CALL_INIT when opening Camera Awesome widget about camerawesome HOT 3 CLOSED

Duplicate of #60

from camerawesome.

Hi,
here is the method that makes this

private void _handleGetTextures(MethodCall call, Result result) {
    if(mCameraPreview == null) {
      result.error("MUST_CALL_INIT", "", "");
      return;
    }
    try {
        long id = mCameraPreview.getFlutterTexture();
        result.success(id);
    } catch (RuntimeException e) {
        result.error("TEXTURE_NOT_FOUND", "cannot find texture", "");
    }
}

The error is just that initialization takes much time. So to reproduce it I simply made the init method much slower.
Flutter start showing our widget before initialization ends, so Flutter FutureBuilder gets an error and shows you a red screen.
As it's only from platform it's not in your console. In release mode Flutter won't show any red screen from futureBuilder.

I can remove this error but I would prefer keeping it. In release mode this error should not be seen.
To prevent you and stop fearing it, I'll prevent the build from our widget if we are not fully initialized.

from camerawesome.

How are you not getting an error for this line

ValueNotifier<Size> _photoSize = ValueNotifier(null);

Im getting "The argument type'Null' can't be assigned tot he parameter type 'Size' yet its in the example code and little code section on the readme page. "

from camerawesome.