(Beginner's question) Data Field first project

Former Member over 10 years ago

Hello

I am fairly new to programming, so probably Monkey C is a long shot for me, but I wanted to give it a try. After a few hours spend looking through samples and forum, I have decided that it would be easier just to ask.

The code that I am posting here is going to be just a base for me to understand how to implement various activity infos into the screen. Eventually I would like to end up with 8 different values displayed on one data field.

using Toybox.WatchUi as Ui;

using Toybox.Graphics as Gfx;

using Toybox.System as Sys;

using Toybox.Activity as Act;



class UUView extends Ui.DataField

	{

	var bla1;

	var info;



function initialize()

{

}



function onUpdate(dc)

    {

    	info = Act.getActivityInfo();

    	

    	if( info.elapsedTime != null )

           {

                bla1 = info.elapsedTime;

            }

                return bla1;

        dc.clear();

        dc.setColor( Gfx.COLOR_WHITE, Gfx.COLOR_RED );

        dc.drawText( 11, 11, Gfx.FONT_SMALL, bla1, Gfx.TEXT_JUSTIFY_LEFT );

    }

}

Eclipse compiles the code just fine, but after running it on simulator, I get no red background color, or anything else displayed, just white screen on watch in simulator.

Please help me figure that out. I bet it is simple and I am dumb :)

travis.vitek over 10 years ago

The problems are pretty simple.

function onUpdate(dc)

{

    info = Act.getActivityInfo();

    	

    if( info.elapsedTime != null )

    {

        bla1 = info.elapsedTime;

    }



    // execution of this function terminates after the following line. the return

    // statement tells the environment that to immediately return to the calling

    // function, which means none of the code below is reachable.

    return bla1;



    // none of this code is reachable....



    // you should call dc.setColor(...) before calling clear. if you don't

    // you have no idea what you just reset the screen color to.

    dc.clear();

    dc.setColor( Gfx.COLOR_WHITE, Gfx.COLOR_RED );



    // be careful about passing objects that are not strings to functions

    // that expect strings. in this case `blah1' is a Toybox.Lang.Number.

    // i'm can't recall if this will cause problems or not, but it is a good

    // idea to be explicit here and pass a string. to do this, you can write

    // `blah1.toString()' or `blah1.format("%d")'

    dc.drawText( 11, 11, Gfx.FONT_SMALL, bla1, Gfx.TEXT_JUSTIFY_LEFT );

}