connect Iq 2... ->4 elementary error

Hello! In 2021, I made a watch face, then it was the era of "", now there is a different development environment, and all the functions work differently. I am trying to transfer my watch face to the new environment, but so far it is not working out very well. Swears at elementary things that seem to work in the help. For example:

using Toybox.Time;
class WatchWeatherView   extends Ui.WatchFace {
   public function onUpdate(dc)
    {
      var now             = Time.now();

    }

Ang get the error:

Error: Unhandled Exception
Exception: UnexpectedTypeException: Expected Number, given Object

Top Replies

flocsy🤠 3 months ago in reply to jim_m_58 +1

He got a runtime exception. How is that related to compile time type check?

All Replies

1211341 3 months ago in reply to FlowState

Yes, but I understand that if I use the new SDK, I lose support for older watch models. But I'll try now.

jim_m_58 3 months ago in reply to 1211341

7.2.1 can build for all devices with CIQ, back to the original ones.

1211341 3 months ago in reply to jim_m_58

It doesn't want to build, I'm afraid that the transition from SDK version 3 to 7 will take quite a long time. Is there any guide for migrate?

1211341 3 months ago in reply to 1211341

There are many errors related to the class "Lang". It seems like it was global before. Now it needs to be declared. I will try to fix all these errors and come back

1211341 3 months ago in reply to jim_m_58

Colleague, I ask for a little help.

I declare method in Tools as public as new syntax, but it is not working.

I don't know why

jim_m_58 3 months ago in reply to 1211341

You are definitely now seeing stuff from type checking. As a test, once again add

project.typecheck=0

to your mokey.jungle to see the difference, now that you are using a current SDK.

1211341 3 months ago in reply to jim_m_58

Yes it is work, but nothing display.

I think there have been a lot of changes for this time, I will try to fix it, but I'm not sure

1211341 3 months ago in reply to jim_m_58

Yes, something is work, but now it is not work. He can't calculate time

1211341 3 months ago in reply to jim_m_58

How I can transrom type?

FlowState 3 months ago in reply to 1211341

The reason you are getting that type error is because Properties.getValue() returns Number or String or ... or Null. The compiler isn't smart enough to know that in this case, the return value is Number or Null.

To get around this problem, use a type cast as follows:

var last_time = app.Properties.getValue("last_time") as Number or Null;
if (last_time == null) {
last_time = 0;
}

Are you sure you want the default for last_time to be 0, though? You are going to get a huge delta (~54 years) when you calculate var delta = now_time - last_time, when last_time is 0.

If it were me, I would preserve last_time when it's null and have special handling for that case. e.g.

var last_time = app.Properties.getValue("last_time") as Number or Null; var delta = null; // delta will be null when last_time is null if (last_time != null) { delta = now_time - last_time; } // ... // code which actually uses delta if (delta == null) { // handle this case (delta / last_time is null) } else { // use delta as before }