ActivityInfo to dataField

Is there anybody who has the problem with showing and ActivityInfo.... data in datafield? I tested to show totalAscent or elapsedDistance in it and it works in simulator, but it shows empty datafield in a watch. I don't know why. I'm sorry. It's my first time when I try to play with this. I read many topics on this forum, but I can't find where I have the problem. I know that DataFields have no access to lap data, but I think, it has an access to ActivityInfo data.

I will be happy for any advice. (i know it is a stupid question).

this is my easy test:

function initialize() {
activityInfo = Act.getActivityInfo();
elaDist = activityInfo.elapsedDistance;
label = DistTest;
}

function compute(info) {
// See Activity.Info
if ( elaDist != null )
{
return elaDist;
}
else
{
return "0";
}
}

Nikeow over 10 years ago

Is there anybody who has the problem with showing and ActivityInfo.... data in datafield? I tested to show totalAscent or elapsedDistance in it and it works in simulator, but it shows empty datafield in a watch. I don't know why. I'm sorry. It's my first time when I try to play with this. I read many topics on this forum, but I can't find where I have the problem. I know that DataFields have no access to lap data, but I think, it has an access to ActivityInfo data.

I will be happy for any advice. (i know it is a stupid question).

this is my easy test:

function initialize() {
activityInfo = Act.getActivityInfo();
elaDist = activityInfo.elapsedDistance;
label = DistTest;
}

function compute(info) {
// See Activity.Info
if ( elaDist != null )
{
return elaDist;
}
else
{
return "0";
}
}

the code seems to be corect. I presume you're using datafield and not simpledatafield?

mr3ska over 10 years ago

huh. I used simpledatafield in code. I haven't thought about it because it runs OK in simulator. Thanks for your help. I'll try to change it to datafield.

travis.vitek over 10 years ago

Your code captures a reference to the elapsedDistance field of the Activity.Info object on construction and never updates it. I'm guessing that the simulator reuses the Activity.Info object, and the device firmware allocate a new one every time. Just to help you understand the problem, consider that getActivityInfo() could be implemented two ways...

function getActivityInfo() {

        var info = new Activity.Info();



        info.elapsedDistance = // ... some calculation ...



        return info;

    }

Or it could be...

hidden var info = null;



    function initialize() {

        info = new Activity.info();

    }



    function getActivityInfo() {

        info.elapsedDistance = // ... some calculation ...

        return info;

    }

I'm guessing the device implements the former and simulator implements the latter. This is probably a simulator bug. The solution is to call Act.getActivityInfo() every time you want the activity information, like so...

function initialize() {

    }



    function compute(info) {

        var activityInfo = Act.getActivityInfo()

        if ( activityInfo.elapsedDistance != null ) 

        {

            return activityInfo.elapsedDistance;

        }

        else

        {

            return "0";

        }

    }

Travis

mr3ska over 10 years ago

Thanks for all your answers. I don't know where I make a mistake. I saw "Failed invoking symbol" error or black screen only. I will do some test with it. :)